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Lesson Posted on 16 May CBSE/Class 12/Science/Chemistry/Unit I: Solid State

Solid State

Asho Singh

I am chemistry faculty and mentor of several students who have secured under 1000 AIR in JEE ADVANCE...

In 3D lattice there are seven crystal systems. 1. Cubic 2. Orthorhombic 3. Tetragonal 4. Monoclinic 5. Hexagonal 6. Rhombohedral 7. Triclinic NOW NOTE FIRST LETTER OF CRYSTAL SYSTEM 1.2.3. COT 4.5.6.7. MHRT In COT all crystallographic angles are equal and 90° Triclinic is most unsymmetrical... read more

In 3D lattice there are seven crystal systems.

1. Cubic 2. Orthorhombic 3. Tetragonal 

4. Monoclinic 5. Hexagonal 6. Rhombohedral 7. Triclinic 

NOW NOTE FIRST LETTER OF CRYSTAL SYSTEM 

1.2.3.  COT [ Kota ( hub of coaching industry)]

4.5.6.7. MHRT [ Maharashtra ] 

In COT all crystallographic angles are equal and 90°

Triclinic is most unsymmetrical crystal system.

 

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Answered on 15 Jun CBSE/Class 12/Science/Chemistry/Unit XII: Aldehydes, Ketones and Carboxylic Acids/Carboxylic Acids

Why Co2 is the gas while sio2  solid (glass)?

Deepika Agrawal

Interested to teach to class 1 to 5 , 6 to 10 , 11&12

The reason why carbon dioxide is a gas and silicon dioxide is a solid is because their chemical structures are different. Carbon dioxide is a linear structure with two double bonds between carbon and oxygen. It is a small molecule and non-polar with only weak bonds between the molecules. Hence it is... read more

The reason why carbon dioxide is a gas and silicon dioxide is a solid is because their chemical structures are different. 

Carbon dioxide is a linear structure with two double bonds between carbon and oxygen. It is a small molecule and non-polar with only weak bonds between the molecules. Hence it is a gas.

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Answered on 12 May CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

Sexual reproduction is a better mode of reproduction. Because it allows the formation of new variants by the combination of the DNA from two different individuals, typically one of each as gender. On the contrary, asexual reproduction allows very little or no variation at all.
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Answered on 12 May CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

The offspring formed by asexual reproduction referred to as clone because the offspring morphologically and genetically similar to each other and parent. In asexual reproduction, the office principle used a morphological as well as genetically identical and exact copies of their parents.
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Answered on 12 May CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

Offspring formed fusion of two gametes, and resultant zygote formation has a better chance of survival, this is because during fusion of two gametes, the gamets of two parents, male, and female, come together and fuse. Thus, the offspring has the genetic material of both the parents.
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Answered on 12 May CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

In asexual reproduction, offsprings are produced by a single parent without the involvement of gamete formation and fusion. Thus offsprings resemble the parent genetically and morphologically. In reproduction, the fusion of two gametes occurs, and fertilization and meiosis are essential events.
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Answered on 18 Jun CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Deepika Agrawal

Interested to teach to class 1 to 5 , 6 to 10 , 11&12

In plants, the units of vegetative propagation such as runner, rhizome, sucker, tuber, offset, bulb are all capable of giving rise to new offsprings. Examples of vegetative propagation: (i) Vegetative propagation by leaves, in Bryophyllum (ii) Vegetative propagation by the stem (rhizome) in Ginger, Turmeric... read more

In plants, the units of vegetative propagation such as runner, rhizome, sucker, tuber, offset, bulb are all capable of giving rise to new offsprings.

Examples of vegetative propagation:

(i) Vegetative propagation by leaves, in Bryophyllum

(ii) Vegetative propagation by the stem (rhizome) in Ginger, Turmeric etc.

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Answered on 13 May CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Narendrakumar Vishwakarma

Physics and maths expert

Gametogenesis is a process of producing gametes. And while producing haploid gametes, the cell has to go through the media. Therefore we can say that meiosis and gametogenesis are always interlinked.
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Answered on 13 May CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Define (a) Juvenile phase, (b) Reproductive phase, (c) Senescent phase. read more

Define

(a) Juvenile phase,

(b) Reproductive phase,

(c) Senescent phase. read less

Anita D.

Education is only a tool with of that u can gain every thing

(a) Juvenile phase:- It is the period of growth in an individual organism after its birth and before it reaches reproductive maturity (b) Reproductive stage:- It is the period when a single organism reproduces sexually (c) Senescent stage:- It is the period when an organism grows old and loses the ability... read more

(a) Juvenile phase:- It is the period of growth in an individual organism after its birth and before it reaches reproductive maturity

(b) Reproductive stage:- It is the period when a single organism reproduces sexually

(c) Senescent stage:- It is the period when an organism grows old and loses the ability to reproduce.

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Answered on 13 May CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?

Anita D.

Education is only a tool with of that u can gain every thing

Although when the fusion of two gametes occurs, it involves more time and energy, the higher organism has resorted to the fusion of two gametes despite its complexity. It is because this mode of reproduction helps introduce new variations in progenies through the combination of the DNA from two (usually)... read more

Although when the fusion of two gametes occurs, it involves more time and energy, the higher organism has resorted to the fusion of two gametes despite its complexity. It is because this mode of reproduction helps introduce new variations in progenies through the combination of the DNA from two (usually) different individuals.

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