CBSE Class 12 Biology Worksheet Set 07 Solved

Official Class 12 Biology Worksheets: All Chapters

Explore reliable practice materials for All Chapters tailored for Class 12 learners. Utilizing these Biology worksheets ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Chapter-wise Practice Material: All Chapters

View or download the dedicated All Chapters practice resource below. Engaging with these objective and subjective questions daily ensures continuous academic progress and mastery of the 2026-27 curriculum.

1. Name the stage of human embryo at which it gets implanted. 
 
2. Will the distribution level of species be affected by gradual increase in temperature? Say briefly.
 
3. State the function of i) acrosome ii) zona pellucida in fertilisation 
 
4. How have plants developed defense against predators? 
 
5. Name the following
i] Species that can tolerate narrow range of temperature are called
ii]The interaction between two species
 
6. What is Lactation? How is it helpful? Why Colostrum is important for baby? 
 
7. Give an example for:
(a) An endothermic animal
(b) An ectothermic animal
(c) An organism of benthic zone
 
8. List any three important characteristics of a population and explain. 
 
9. What is altitude sickness? How does the body overcome this?
 
VALUE POINTS 
 
1. Blastocyst 
 
2. Yes, the pattern of distribution will shift towards the poles with increase in temperature
 
3. acrosome= help the sperm enter into the cytoplasm of the ovum through the zona pellucida and plasma membrane." zona pellucida - block the entry of more than one sperm into egg during fertilization.
 
4. Morphological-thorns and Spines; chemical-cardiac glycosides defences 
 
5. stenothermal
interspecific interaction
 
6. mammary gland starts differentiating and producing milk at the end of pregnancy./ to feed the baby/ contains antibodies to provide immunity to baby.
 
7. (a) An endothermic animal: Human being (Mammal)
(b) An ectothermic animal: Frog (Amphibian)
(c) An organism of benthic zone: Bacteria (Decomposers)
 
8. i. Density: It is expressed as the total number of individuals per unit area or volume at a given time. The size of the population is determined by the available resources nutrients, water etc. at a given time and other group properties such as natality, mortality and age structure.
ii. Natality: It is the increase in the number of individuals in a population under given environmental conditions. Birth, hatching, germination and even vegetative propagation cause increase in the number of individuals.
iii. Mortality: The loss of individuals due to death in a population under given environmental conditions is called mortality.
 
9. At higher altitudes the body shows symptoms like nausea, fatigue, Heart palpitations, due to insufficient oxygen in the body. The body increases RBC production, decreases oxygen binding capacity of haemoglobin and I ncreases breathing rate.


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All Chapters Practice Sheet and Solutions for Class 12 Biology

All Chapters Printable Worksheet for Class 12 Biology

Explore reliable practice questions for All Chapters tailored for Class 12 Biology learners. Use these structured worksheets to evaluate preparedness and strengthen problem-solving skills.

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FAQs

Where can I download the latest PDF for CBSE Class 12 Biology Worksheet Set 07 Solved?

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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 07 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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Yes, we have provided detailed solutions for CBSE Class 12 Biology Worksheet Set 07 Solved to help Class 12 and follow the official CBSE marking scheme.

How does solving CBSE Class 12 Biology Worksheet Set 07 Solved help in exam preparation?

Daily practice with these Biology worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 12 students get more marks in CBSE exams.

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