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Q11(a):
Name the following:
(a) A chordate animal having flame cells as excretory structures
Solution :
Step 1: Analyzing the Excretory System of Chordates
To identify the organism requested, one must first evaluate the standard excretory structures found within the phylum Chordata. Chordates typically possess specialized organs such as protonephridia, mesonephric kidneys, or metanephric kidneys [Per Vertebrate Evolutionary Biology].
Step 2: Identifying the Exception
The term "flame cells" (also known as protonephridia) is canonically associated with the phylum Platyhelminthes (flatworms). However, the prompt specifies a chordate animal. In the subphylum Cephalochordata, specifically within the genus Branchiostoma (commonly known as Amphioxus or lancelets), the excretory system consists of specialized structures called solenocytes.
Solenocytes are structurally and functionally homologous to flame cells, as they utilize a flagellar tuft to create a pressure gradient for filtration [Per Comparative Physiology of Invertebrates].
Step 3: Visual Representation of the Solenocyte/Flame Cell Mechanism
Step 4: Final Taxonomic Classification
The organism is Branchiostoma (Lancelet). It serves as a classic example of an invertebrate chordate. While "flame cells" are most common in flatworms, Branchiostoma utilizes the functionally identical solenocytes for osmoregulation and excretion [By Biological Nomenclature].
Final Solution: The chordate animal that possesses structures (solenocytes) analogous to flame cells is Branchiostoma (Amphioxus/Lancelet).
More Questions from Class 11 Biology Excretory Products and Elimination EXERCISES
- Q1: Define Glomerular Filtration Rate (GFR)
- Q2: Explain the autoregulatory mechanism of GFR.
- Q3(a): Indicate whether the following statements are true or false : (a) Micturition is carried out by a reflex.
- Q3(b): Indicate whether the following statements are true or false : (b) ADH helps in water elimination, making the urine hypotonic.
- Q3(c): Indicate whether the following statements are true or false : (c) Protein-free fluid is filtered from blood plasma into the Bowman’s capsule.
- Q3(d): Indicate whether the following statements are true or false : (d) Henle’s loop plays an important role in concentrating the urine.
- Q3(e): Indicate whether the following statements are true or false : (e) Glucose is actively reabsorbed in the proximal convoluted tubule.
- Q4: Give a brief account of the counter current mechanism.
- Q5: Describe the role of liver, lungs and skin in excretion.
- Q6: Explain micturition.
- Q7: Match the items of column I with those of column II : Column I Column II (a) Ammonotelism (i) Birds (b) Bowman’s capsule (ii) Water reabsorption (c) Micturition (iii) Bony fish (d) Uricotelism (iv) Urinary bladder (e) ADH (v) Renal tubule
- Q8: What is meant by the term osmoregulation?
- Q9: Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why ?
- Q10: What is the significance of juxta glomerular apparatus (JGA) in kidney function?
- Q11(b): Name the following: (b) Cortical portions projecting between the medullary pyramids in the human kidney
- Q11(c): Name the following: (c) A loop of capillary running parallel to the Henle’s loop.
- Q12(a): Fill in the gaps : (a) Ascending limb of Henle’s loop is _______ to water whereas the descending limb is _______ to it.
- Q12(b): Fill in the gaps : (b) Reabsorption of water from distal parts of the tubules is facilitated by hormone _______.
- Q12(c): Fill in the gaps : (c) Dialysis fluid contain all the constituents as in plasma except _______.
- Q12(d): Fill in the gaps : (d) A healthy adult human excretes (on an average) _______ gm of urea/day.
CBSE Solutions for Class 11 Biology Excretory Products and Elimination
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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