CBSE Class 12 Biology Worksheet Set 09 Solved

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1. Where does fertilisation occur in human reproduction? 
 
2. What is brood parasitism? 
 
3. What is parturition? How is it induced? 
 
4. How does temperature affect distribution of animals? Name two types based on their temperature tolerance.
 
5. Distinguish between the following:
(a) Hibernation and Aestivation (b) Ectotherms and Endotherms
 
6. Write down the chromosome pattern in human male and female. Who determines the sex of a child in human and how?
 
7. Define the following terms:
i] Allen's rule ii] competitive release iii] resource partitioning
 
8. Give reason
i] monarch butterfly survives from its predator
ii] Kangaroo rats can survive in the absence of an external source of water
iii] Small animals are rarely found in Polar Regions
 
9. What is age pyramid? Mention its types. State India belongs to which type of age pyramid. 
 
VALUE POINTS
 
1. Ampullary-Isthmus Junction 
 
2. One species lays eggs in the nest of another bird, lets the host incubate them.
E.g. Cuckoo lays eggs in the nest of a crow
 
3. processof delivery of the foetus/ foetal ejection reflex. 
 
4. Enzymes activity and therefore metabolic activities ,Eurythermal,stenothermal 
 
5. a) hibernation - winter sleep / Aestivation- summer sleep
b) ectotherms-COLD blooded endotherm- WARM blooded animals
 
6. human male - XY ; human female- XX Male
male produces two types of games i.e., X and Y / X carrying sperm fertilizes egg it is a female child/ Y carrying chromosome fertilizes egg cell it is male.
 
7. i]Allen’s rule states that those animals, e.g., mammals from colder climates generally have shorter ears and limbs to minimize heat loss."
ii]A species, whose distribution is restricted to a small geographical area because of the presence of a competitively superior species, is found to expand its distributional range dramatically when the competing species is experimentally removed"
iii]If two species compete for the same resource, they could avoid competition by choosing, for instance, different times for feeding or different foraging patterns. This is called resource partitioning"
 
8. i] The Monarch butterfly is highly distasteful to its predator (bird) because of a special chemical present in its body. Interestingly, the butterfly acquires this chemical during its caterpillar stage by feeding on a poisonous weed."
ii]Kangaroo rat is capable of meeting its entire water requirement through its internal fat oxidation in which water is a by -product. It has the ability to concentrate urine"
iii]Smaller animals tend to lose more body heat due to large surface area relative to their volume. Therefore, they have to spend more energy to generate body heat"
 
9. If the age distribution (per cent individuals of a given age or age group) is plotted for the population, the resulting structure is called an age pyramid expanding/stable/ declining expanding


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Practice Worksheet and Study Resources for Class 12 Biology All Chapters

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Are these Biology Class 12 worksheets based on the 2026-27 competency-based pattern?

Yes, our CBSE Class 12 Biology Worksheet Set 09 Solved includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 12.

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