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Lesson Posted on 21 Jun Exam Coaching/NEET-UG Coaching

Homeostasis and its Importance in Life

Nirmala Kamalaka Rao

I am biology faculty and love teaching the subject. I always believe that with right efforts any student...

Homeostasis is a self-regulatory mechanism by which organisms maintain constant internal environment irrespective of external changes. Very interesting to see how this works in thermoregulation. Thermoregulation is regulation of temperature inside the body. Human body always maintains a constant temperature... read more

Homeostasis is a self-regulatory mechanism by which organisms maintain constant internal environment irrespective of external changes. Very interesting to see how this works in thermoregulation. Thermoregulation is regulation of temperature inside the body. Human body always maintains a constant temperature of 98.4degree F., And the temperature regulator of the Human body (thermostat) is the Hypothalamus of the brain.

Assume you went out during summer heat your body temperature increases. The central nervous system senses and sends the message to the hypothalamus which will, in turn, corrects the temperature by

  •     Sweating: Your Sweating is released by sweat glands, which cools your skin as it evaporates. This helps to lower your internal temperature.
  •     Vasodilatation: The blood capillaries under your skin get wider to increase blood flow to your skin where it is cooler — away from your warm inner body. This lets your body release heat through heat radiation to the atmosphere.


Similarly, assume you went out on a cold day where the temperature is around 5-10 degree, your hypothalamus will bring back the temperature by

  •     Vasoconstriction: The blood vessels under your skin become narrower which in turn decreases blood flow to your skin, retaining heat near the warm inner body.
  •     Shivering: Your body’s muscles, organs, and brain produce heat in a variety of ways. For example, muscles can produce heat by shivering.
  •     Hormones: Hormones are released by the thyroid gland to increase your metabolism. This increases the energy your body creates and the amount of heat it produces.


This is how your body maintains homeostasis.

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Lesson Posted on 04 Apr CBSE/Class 11/Science/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Advanced Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Crash Course +4 Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Foundation Course Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Integrated Coaching Exam Coaching/NEET-UG Coaching IIT JEE less

Tension in a String!

Vishesh Nigam

I am a Chemical Engineer and Khan Academy Talent Hunt Finalist (2017)(please watch my winning video below...

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Lesson Posted on 27 Mar Exam Coaching/Medical Entrance Coaching/NEET-PG Coaching Exam Coaching/NEET-UG Coaching

DC can be stored, but AC can't. Why?

Kumar Kumar Sir

Earlier working with FIITJEE and Aakash about 18 years and now running an institute in The name of Kumar...

Dc does not have any cycle and consists of positive and negative(like square waveform) polarity, and the frequency of DC supply is always zero because the time period is infinity. But, in case of AC, the average value for one complete cycle is equal to zero hence AC cannot be stored, but DC can be s... read more

Dc does not have any cycle and consists of positive and negative(like square waveform) polarity, and the frequency of DC supply is always zero because the time period is infinity.

But, in case of AC, the average value for one complete cycle is equal to zero hence AC cannot be stored, but DC can be stored.

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Lesson Posted on 23 Mar Exam Coaching/NEET-UG Coaching

NEET Conservation of Linear Momentum

Kumar Kumar Sir

Earlier working with FIITJEE and Aakash about 18 years and now running an institute in The name of Kumar...

Q. A body of mass 5 kg, initially at rest, explodes and breaks into three fragments of masses in the ratio 1: 1 : 3. The two fragments of equal masses fly off perpendicular to each other, each with a velocity of 21 ms–1. The velocity of the heavier fragment is (a) 6.5ms–1 (b) 7ms–1... read more

Q. A body of mass 5 kg, initially at rest, explodes and breaks into three fragments of masses in the ratio 1: 1 : 3. The two fragments of equal masses fly off perpendicular to each other, each with a velocity of 21 ms–1. The velocity of the heavier fragment is

(a) 6.5ms–1 (b) 7ms–1 (c) 9.87 ms–1 (d) 11.5 ms–1

Answer (c): Since 5 kg body explodes into three fragments of masses in the ratio 1: 1 : 3, hence masses of the three fragments will be 1 kg, 1 kg and 3 kg, respectively. The magnitude of the resultant momentum of two fragments each of mass 1 kg, moving with velocity 21 m s–1 in

the perpendicular direction is 21 2 kg m s–1.
According to law of conservation of linear momentum,

3 × v = 21 2 or v = 21 2 / 3 = 7 2 = 9.87 m s–1

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Lesson Posted on 05 Feb Exam Coaching Exam Coaching/NEET-UG Coaching Exam Coaching/Medical Entrance Coaching

NEET Biology Sample Paper 1

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1. Which one of the following is employed as Anti Histamine? a. Omeprazoleb. Chloramphenicolc. Diphenyl hydramined. Norothindione 2. Which one of the following has the highest number of species in nature? a. Angiospermb. Fungic. Insectsd. Birds 3. The gametophyte is not an independent, free living... read more

1. Which one of the following is employed as Anti Histamine?

a. Omeprazole
b. Chloramphenicol
c. Diphenyl hydramine
d. Norothindione


2. Which one of the following has the highest number of species in nature?

a. Angiosperm
b. Fungi
c. Insects
d. Birds


3. The gametophyte is not an independent, free living generation in:

a. Pinus
b. Polytrichren
c. Adiantum
d. Marchantia


4. Important site for formation of glycoprotein and glycolipid is:

a. Lysosomes
b. Vacuoles
c. Golgi apparatus
d. Plastids


5. Mutation can be induced by:

a. Gamma radiation
b. Infrared radiation
c. IAA
d. Ethylene


6. A collection of plant and seeds having diverse alleles of all the genes of a crop called:

a. Genome
b. Herbarium
c. Germplasm
d. Gene library


7. Which one of the following statement is correct?

a. Flower of Tulip is a modified root
b. In Tomato, fruit is a capsule
c. Seeds of Orchids of oil rich endosperm
d. Placentation in primrose is Basal


8. A drupe develops in:

a. Tomato
b. Wheat
c. Mango
d. Pea


9. The ovary is half inferior in flowers of:

a. Guava
b. Peach
c. Cucumber
d. Cotton


10. Wind pollination is common in:

a. Orchids
b. Legumes
c. Lilies
d. Grasses

11. Which one of the following groups of animals is correctly matched with its one characteristic features without even a single exception?

a. Mammalia: Give birth to young ones
b. Reptilia: possess three chambered heart with one is completed divided ventrically
c. Chordata: Possess a mouth provided with an upper and lower jaw
d. Chondrichthyes: Possess cartilaginous endo skeleton


12. The Ciliated columnar epithelial cells in humans are known to occur in:

a. Fallopian tube and urethra
b. Eustachian tube and stomach lining
c. Bronchioles and Fallopian tubes
d. Bile duct and esophagus


13. Which one of the following enzymes carries out the initial step in the digestion of milk in humans?

a. Trypsin
b. Pepsin
c. Rennin
d. Lipasc


14. Which of the following is not a part of renal pyramid?

a. Loops of henle
b. Peritubular capillaries
c. Convoluted tubes
d. Collecting duct


15. “Bundle of his” is a part of which one of the following organs in humans:

a. Pancreas
b. Brain
c. Heart
d. Kidney


16. Which one of the following plasma protein is involved in the coagulation of blood?

a. Fibrinogen
b. An albumin
c. Serum Amylase
d. A globulin


17. Arteries are best defined as the vessels which:

a. carry blood from one visceral organs to another visceral organ
b. Supply oxygenated blood to the different organs
c. Carry blood away from the heart to different organs
d. Breakup into capillaries which reunite the form a vein


18. The testis in human are situated outside the abdominal cavity inside a pouch called Scrotum and the purpose served for:

a. Providing a secondary features for exhibiting the male sex
b. Maintaining the scrotal temperature lower than the internal body temperature
c. Escaping any possible compression by the visceral organ
d. Providing more space for the growth of epididymis


19. A certain patient is suspected to the suffering of AIDS. Which diagnostic technique will you recommend for its reduction?

a. WIDAL
b. ELISA
c. MRA
d. Ultrasound


20. Given below is a sample of portion of DNA strand giving the base sequence on the opposite strands, what is so special shown in it?
5’-GAATTC- 3’

3’-CTTAAG- 5’
a. Palindromic sequence of space pairs
b. B. Replication Completed
c. Deletion mutuation
d. Start Codon at the 5’ end

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Lesson Posted on 05 Feb Exam Coaching/Medical Entrance Coaching Exam Coaching/NEET-UG Coaching Exam Coaching/Medical Entrance Coaching/AIIMS Coaching +1 Exam Coaching/Medical Entrance Coaching/AIPMT Coaching less

NEET Biology Sample Paper 2

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21. The most common substrate used in the distilleries for the production of ethanol is: a. Molassesb. Corn mealc. Soya meald. Ground gram 22. Which one of the following is an amine hormone? a. Progestroneb. Thyroxinec. Oxypurined. Insulin 23. Which one of the following phyla is correctly with its... read more

21. The most common substrate used in the distilleries for the production of ethanol is:

a. Molasses
b. Corn meal
c. Soya meal
d. Ground gram


22. Which one of the following is an amine hormone?

a. Progestrone
b. Thyroxine
c. Oxypurine
d. Insulin


23. Which one of the following phyla is correctly with its two general characteristics?

a. Mollusca: Normally oviparous and development through a Trochophore or Veligerlarva
b. Arthopoda: Body divided into head, thorax and abdomen and respiration by trachea
c. Chordata: Notochord at some stage and separate  and urinary openings to the outside
d. Echinodermata: Pentamerous radial symmetry and mostly and internal fertilization


24. Vacuole in a plant cell:

a. Lacks membranes and contains water and excretory substance
b. Is membrane bound and contains storage proteins and lipids
c. Is membrane bound and contains water and excretory substance
d. Lack membrane and contains hair


25. A competitive incubator of succinic dehydragenase is:

a. Mallate
b. Malonate
c. Oxyacetate
d. Alphaketogluctarate


26. Thorns of Bougainvillea and Tendiril of cucurditta are examples of:

a. Retrogressive evolution
b. Anologous organs
c. Monologous organs
d. vestigial Organs


27. Which one of the following conditions in humans is correctly matched with its chromosomal abnormality linkage?

a. Down syndrome: 44 autosomes/ XO
b. Klinefelter’s syndrome: 44 autosomes+XXY
c. Color blindness: Y linked
d. Erythroblastosis Foetalis: X linked


28. Which one of the following scientist correctly matched with the theory put forth by him?

a. Mendel: Theory of Pangenesis
b. Weismann: Theory of continuity of germ plasm
c. Pasteur: Inheritance of acquired character
d. De veries: Natural selection


29. Darwin finchis are an excellent example of:

a. Connecting links
b. Adaptive radiation
c. Seasonal migration
d. Brood Parasitism


30. The fruit chambered, developed from inferior ovary and has seed with succulent testa in:

a. Cucumber
b. Pomegranate
c. Orange
d. Gauva


31. Dry inbehiscent single seeded fruit formed from bicarpellary syncarpous inferior ovaries:

a. Gemocarp
b. Caryopesis
c. Cypsela
d. Berry


32. Senescence as an active developmental cellular process in the growth and functioning of a flowering plants, is indicated in:

a. Floral parts
b. Vessels and Tracheid differentiation
c. Leaf abscission
d. Annual plants


33. Nitrogen fixation in roots nodules of Alnus is brought about by:

a. Azo rhizhobium
b. Brady Rhizhobium
c. Clostridium
d. Frankia


34. Electrons from excited chlorophyll molecules of photo systems II are accepted first by:

a. Ferredoxin
b. Cytochrome-b
c. Cytochrome-f
d. Quinon

35. Which one of the following is the correct matching of the site of action on the given substrate, the enzymes acting upon it and the end product?
a. Stomach: Fats Lipsase Micelles
b. Duodenum: Triglycerides Trysin Monoglycerides
c. Small Intestine: Starch α-Amylase Disaccharides (Maltose)
d. Small Intestine: Protein pepsin Amino Acids


36. The blood calcium level is lowered by the deficiency of:

a. Calcitonin
b. Parathormone
c. Thyroxine
d. Both Calcitonin and Parathormone


37. In human adult female, oxytocin:

a. causes strong uterine contractions during partiturtion
b. Is secreted by anterior pituitary
c. Stimulates growth of mammary glands
d. Stimulates pituitary to secrete Vasopressin


38. Human Insulin is being commercially produced from a transgenic species of:

a. Sacchoromyces
b. Escherichia
c. Myobacterium
d. Ryzhobium


39. Cornea transplant in humans is almost never rejected, this is because:

a. It is a non living layer
b. Its cells are least penetrable by bacteria
c. It has no blood supply
d. It is composed of anucleated cells

40. The linking of antibiotics resistance gene with the plasmid vector became possible with:

a. Exonucleases
b. DNA ligase
c. Endonucleases
d. DNA polymerase

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Lesson Posted on 05 Feb Exam Coaching/Medical Entrance Coaching/AIIMS Coaching Exam Coaching/Medical Entrance Coaching/AIPMT Coaching Exam Coaching/NEET-UG Coaching +1 Exam Coaching/Medical Entrance Coaching less

NEET Chemistry Sample Questions

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1. Which of the following is a form of potential energy? a. Radiant energyb. Thermal energy c. Chemical energy d. Electrical energy 2, Which one of the following is not the unit of energy?a. Watt b. Joule c. Calorie d. Erg ... read more

1. Which of the following is a form of potential energy?

a. Radiant energy
b. Thermal energy
c. Chemical energy
d. Electrical energy     
                                     
2, Which one of the following is not the unit of energy?

a. Watt
b. Joule
c. Calorie
d. Erg                                                              

3. A well _ stopped thermos flask containing some ice cubes is an example of an:

a. Isolated system
b. Cyclic system
c. Closed system
d. Open system                  

4, The state of a thermodynamics system is described by its properties:

a. Atomic.
b. Macroscopic
c. Microscopic.
d. None of these                                                

5. Which of the following variables are called state variables or state functions?

a. P
b. V
c. T
d. All of these                           

6. Work(w) is a path function, i.e, the amount of work done is dependent on the process. Is it a reversible process?   

a. Zero   
b. Smallest
c. Infinite   
d. Greatest

7. According to the first law of thermodynamics, the internal energy of a/an is constant?
a. Open system  
b. Isolated system
c. Closed system
d. Thermodynamic system

8. Change in the internal energy of the thermodynamic system is called heat of reaction at constant?

a. Temperature
b. Pressure
c. Vvolume  
d. Bboth (a & c)      

9. The heat flow under conditions is a direct measurement of delta H?

a. Isochoric  
b. Isothermal
c. Isobaric   
d. Adiabatic

10. Which of the following is an intensive property?

a. Volume   
b, Enthalpy
c. Refractive index
d, Internal energy

11, which of the following is an extensive property?

a. Heat capacity  
b. Molar heat capacity
c. Specific heat capacity
d. Both (b &c)

12. Which of the following heat changes is measured with help of bomb calorimeter?

a. Heat of neutralization  
b. Heat of ionization
c. Heat of fusion
d. Heat of combustion

13. Which of the following describes the thermodynamic standard state of carbon?
a. Graphite  
b. Diamond  
c. Buckminsterfullerene
d. Charcoal

14. Standard enthalpy of fusion is the amount of heat required to melt one of a solid at its melting point and std pressure of one bar?
a. Gram
b. Kilogram
c. Mole
d. Molecule

15, the coefficient in a balanced thermochemical equation refer to a number of reactant & product involved in the reaction?
a. Moles.  
b. Molecules
c. Volume
d. All of these

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Lesson Posted on 02 Feb Exam Coaching/NEET-UG Coaching Exam Coaching/Medical Entrance Coaching

NEET Chemistry Sample Questions: Solid State

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1) The molecules of the substance are formed by polar covalent bonds:A) HCL.B) H2.C) CL2.D) I2.2) There are only 14 possible 3D lattices are called:A) Straight lattice.B) Unit lattice.C) Bravais lattice.D) Crystal lattice.3) Packing efficiency of hcp:A) 74.B) 70.C) 72.D) 80.4)The point defect that does... read more

1) The molecules of the substance are formed by polar covalent bonds:

A) HCL.
B) H2.
C) CL2.
D) I2.

2) There are only 14 possible 3D lattices are called:

A) Straight lattice.
B) Unit lattice.
C) Bravais lattice.
D) Crystal lattice.


3) Packing efficiency of hcp:

A) 74.
B) 70.
C) 72.
D) 80.


4)The point defect that does not disturbs the stoichiometric of the solid.

A. Intrinsic defect.
B. Thermodynamic defect.
C. Both a & b.
D. None.


5) When some of the lattice sides are vacant, the crystal is said to have vacancy defect.

A. Density is decreased.
B. Density is increased.
C. Density is constant.
D. None.


6) Vacancy defect shows:

A. Frenkel defect.
B. Schottky defect.
C. Dissolocation defect.
D. Interstitial defect.


7) Metal excess defect due to:

A. Anionic defect.
B. Cationic defect.
C. Intermolecular defect.
D. Both a & b.

8) The metals which allow passage of electricity is called:

A. Conductors
B. Insulators
C. Semiconductors
D. None


9) The substance that is weakly attracted by a magnetic field:

A. Antiferro.
B. Paramagnetism.
C. Diamagnetism.
D. Ferromagnetism.


10) A few substances like iron, cobalt, nickel are attracted very strongly by a magnetic field.

A. Paramagnet.
B. Ferromagnet.
C. Diamagnet.
D. Antiferro.


11) Simple cubic has:

A. 3 atoms.
B. 2 atoms.
C. 1 atom.
D. 4 atoms.


12) FCC has:

A. 1 atom
B. 4 atoms
C. 3 atoms
D. 2 atoms


13) Crystalline solid has:

A. Long-term order.
B. Short-term order.
C. Maximum order.
D. Minimum order.


14) Group 13-15 elements contain:

A. N-type semiconductor.
B. P-type semiconductor.
C. Both a & b.
D. Neutral semiconductor.


15) The impurities are introduced by semiconductor that changed their electrical properties:

A. Doping.
B. Hopping.
C. Electrical conductors.
D. Sea of electrons.


16) The example of amphorous & crystalline solid:

A. Quartz.
B. Sea of electrons.
C. Diamond.
D. Graphite.


17) Bcc has:

A. 2 atoms.
B. 4 atoms.
C. 1 atom.
D. 3 atoms.


18)the regular 3d arrangement of points in a space:

A. Point lattice
B.crystal lattice
C.bravis lattice
D primitive lattice


19) The anionic sites occupied by unpaired electrons are called:

A. F center.
B. C center.
C. B center.
D. Both a & b.


20) Semiconductors of solid with conductivity in the internet range from:

A. 10^-6 to 10^ 4.
B. 10^-20 to 10^-10.
C. 10^7.
D. 10^-20 to 10^6.

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Lesson Posted on 02 Feb Exam Coaching/NEET-UG Coaching Exam Coaching/Medical Entrance Coaching

Neet Sample Question Paper Biology

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1. Five Kingdom Classification is mainly based on: a) Complexity of all structure.b) Mode of nutrition.c) Complexity of body organization.d) Ecological role. 2. Which of the following is the major group of Monera? a) Eubacteria.b) Cyanobacteria.c) Archaebacteria.d) All of these. 3. Bivalved... read more

1. Five Kingdom Classification is mainly based on:

a) Complexity of all structure.
b) Mode of nutrition.
c) Complexity of body organization.
d) Ecological role.

 

2. Which of the following is the major group of Monera?

a) Eubacteria.
b) Cyanobacteria.
c) Archaebacteria.
d) All of these.

 

3. Bivalved siliceous shell or frustule occur in:

a) Diatoms.
b) Radiolarians.
c) Zoo flagellates.
d) Archaebacteria.

 

4. Bacteria which can survive in the absence of oxygen are known as:

a) Obligate anerobes.
b) Obligate aerobes.
c) Facultative anerobes.
d) Facultative aerobes.

 

5. Cellulose is generally absent in the cell wall of bacteria except in few such as Acetobacter and Zymosarcina. In most bacteria, it is composed of:

a) Chitin.
b) N-acetyl muraminic acid.
c) Alternating units of NAM & NAG.
d) 1, 3, - linked glucose molecule.

6. The photosynthetic protests are:

a) Diatoms, euglenoids and slime molds.
b) Sarcodines, dinoflagellates and diatoms.
c) Euglenoids, diatoms and dinoflagellates.
d) Ciliates, zoo flagellates and dinoflagellates.

 

7. What rust of crucifer is caused by:

a) Albugo candida.
b) Sclerospora.
c) Phytophthora infestans.
d) Pythuim debaryanum.

 

8. Members of ____ are found in aquatic habitats and on decaying wood in moist and damp places or as obligate parasites on plants, mycelium is aseplate and coenocyter:

a) Phycomyetes.
b) Ascomyetes.
c) Basidiomyetes.
d) Deuteromycetes.

 

9. Branched conidio spores are found in:

a) Pencillin.
b) Rhizopus.
c) Ustilago.
d) Saccharomyces.

 

10. Ergob is a product of:

a) Rhizopus.
b) Claviceps purpurea.
c) Aspergillus.
d) Sclerospora.

 

11. An edible part of mushroom is:

a) Primary mycelium.
b) Secondary mycelium.
c) Rhizomorph.
d) Bsidiocarp.

 

12. Species separated by geotropical harriers are vallert:

a) Allopatric.
b) Sympatric.
c) Sibling.
d) Endemic.

 

13. Non-symbiotic N 2 - fixing bacteria is:

a) Rhizobium.
b) Azospirilium.
c) Azotobacter.
d) Nitrosomonas.

 

14. Which one produces gas by decomposing the gobar in gobargas?

a) Fungus.
b) Virus.
c) Methanogenic.
d) Algae.

 

15. Difference between prokaryotes and Eukaryotes is:

a) SS circular DNA in prokaryotes.
b) Histone with prokaryote DNA.
c) Operon in eukaryotes.
d) Momberane bound organelles in eukaryotes.

 

16. According to five kingdom system, blue green algae belongs to:

a) Metaphyta.
b) Monera.
c) Protista.
d) Algae.

 

17. The pigment phycocyanin and phycoerythrin are present is:

a) Bacillariophyceae.
b) Axchibacteria.
c) Eubacteria.
d) Cyanobacteria.

 

18. Which of the following is correct?

a) Bacteria are only autotrophic.
b) Bacteria are only heterotrophic.
c) Most are heterotrophic but few are autotrophic.
d) Most bacteria are autotrophic but few are heterotropic.

 

19. Crown galls are caused in plants due to infection of:

a) Insects.
b) Virus.
c) Bacteria.
d) Fungi.

 

20. Find out the pairs that are correctly matched:

1) Cyanobacteria (i) Biopesticides.
2) Mycorrhiza (ii) Solubilization of phosphate.
3) Bacillus (iii) cry protein thuringiensis.
4) Single cell protein (iv) Rhizobia.
a) 1 and (ii)
b) 3 and (iii)
c) 2 and (iii)
d) 1 and (iii)
e) 2 and (iv)

 

21. The presence of a cluster of polar flagella is termed as:

a) Monotrichous.
b) Amphitrichous.
c) Lophotrichous.
d) Peritrichous.

 

22. What are infoldings of plasma membrane called in prokaryotes which store respiratory pigments?

a) Glyoxysomes.
b) Oxysomes.
c) Mesosomes.
d) Cristae.

 

23. In prokaryotes genetic recombination can occur during:

a) Trans duction.
b) Transformation.
c) Conjugation.
d) All of these.

 

24. Thermococues, Methanococcus and Methanobacteruim exemplity:

a) Archaebacteria that contain protein homologous to eukaryotic core histones.
b) Archaebacteria that lack anytist one resembling those found in eukaryotes but whose DNA is negatively supercoiled.
c) Bacteria whose DNA is relaxed or positively supercoiled which have a cytoskeleton as well as mitochondria.
d) Bacteria that contains a cytoskeleton and ribosomes.

 

25. Which of the following is a bacterial disease?

a) Red rust of tea.
b) Citrus canter.
c) Red rot of sugarcane.
d) Late blight of potato.

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Answered on 28/12/2017 Exam Coaching/NEET-UG Coaching

Are medical students supposed to write only NEET?

Mahesh

Hi, No,we do have so many entrance exams also through NEET also there are multiple opportunities to join MBBS,like NEET,AIIMS,JIPMER,
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