CBSE Class 12 Biology Worksheet Set 08 Solved

Class 12 Biology Practice Set: All Chapters

Review targeted practice sets for Class 12 Biology All Chapters. Built according to official educational guidelines for the 2026-27 academic year, these downloadable worksheets support daily revision and core concept reinforcement.

Download All Chapters Worksheet PDF

Access the complete worksheet PDF for All Chapters below. Regular practice with these targeted questions builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.

1. Why is female mosquito not considered as a parasite? 
 
2. When and Where do chronic villi appear in human? 
 
3. What is the importance of light for organisms? How do deep sea organisms get their energy? 
 
4. Define population and community. 
 
5. During pregnancy, female body will have several hormones in high level. How it is helpful for them?
 
6. Define the following terms and give one example for each:
(a) Commensalism
(b) Parasitism
© Camouflage
 
7. In what way does logistic growth differ from exponential growth? 
 
8. How does constancy in the internal environment help an organism? How do organisms achieve it with regard to temperature? Give example.
 
9. State three functions of placenta in human.
 
 
VALUE POINTS 
 
1. It does not live in/on the body of the host 
 
2. Chrorionic villi appears after implantation/blastocyst embedded in inner most wall of uterus i.e.endometrium. • On the Trophblast
 
3. Quality of light, photoperiod affect photosynthesis, affect reproductive,foraging activities, ii)scavenging and predation
 
4. population - group of similar individuals with same features and capable of interbreeding.
Community- assemblage of different population.
 
5. supporting the fetal growth,metabolic changes in the mother and maintenance of pregnancy. ( for any two)
 
6. (a) Commensalism: Commensalism is an interspecific interaction between two species where one species is benefitted and the other remains unaffected.
Example: Orchid and mango tree.
(b) Parasitism: It is a relationship between two organisms where the larger animal is at harm and the smaller animal is benefitted.
Example: Malarial parasite and human beings.
(c) Camouflage: Camouflage is the ability of animals to blend with the surroundings or background. In this way, animals remain unnoticed for protection or aggression. Example: Stick insect.
 
7. exponential growth takes place when resources are unlimited and therefore the reproductive potential is highest. Logistic growth shows that the population cannot grow beyond the carrying capacity of the environment.(Depict graphically)
 
8. Constant internal environment permits all biochemical reactions to proceed with maximal efficiency, ii) regulate by physiological means eg sweating to reduce temperature when the external temperature increases.
 
9. facilitate supply of nutrients and oxygen removal of wastes produced by foetus acts as endocrine tissue


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All Chapters Practice Sheet and Solutions for Class 12 Biology

Download Practice Sheet: All Chapters (Class 12 Biology)

Review targeted practice exercises for Class 12 Biology All Chapters. Curated to match official CBSE guidelines, these downloadable PDF sheets support daily revision and core concept reinforcement.

Concept Clarification for All Chapters

Built using the official NCERT book for Class 12 Biology, these practice materials provide reliable academic guidance. Pair your practice with our recommended NCERT solutions to master optimal problem-solving approaches.

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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 08 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 08 Solved to help Class 12 and follow the official CBSE marking scheme.

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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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