CBSE Class 12 Biology Worksheet Set I Solved

Access the latest CBSE Class 12 Biology Worksheet Set I Solved. We have provided free printable Class 12 Biology worksheets in PDF format, specifically designed for All Chapters. These practice sets are prepared by expert teachers following the 2025-26 syllabus and exam patterns issued by CBSE, NCERT, and KVS.

All Chapters Biology Practice Worksheet for Class 12

Students should use these Class 12 Biology chapter-wise worksheets for daily practice to improve their conceptual understanding. This detailed test papers include important questions and solutions for All Chapters, to help you prepare for school tests and final examination. Regular practice of these Class 12 Biology questions will help improve your problem-solving speed and exam accuracy for the 2026 session.

Download Class 12 Biology All Chapters Worksheet PDF

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


Please click on below link to download CBSE Class 12 Biology Worksheet Set I Solved

All Chapters CBSE Class 12 Biology Worksheet

Students can use the All Chapters practice sheet provided above to prepare for their upcoming school tests. This solved questions and answers follow the latest CBSE syllabus for Class 12 Biology. You can easily download the PDF format and solve these questions every day to improve your marks. Our expert teachers have made these from the most important topics that are always asked in your exams to help you get more marks in exams.

NCERT Based Questions and Solutions for All Chapters

Our expert team has used the official NCERT book for Class 12 Biology to create this practice material for students. After solving the questions our teachers have also suggested to study the NCERT solutions  which will help you to understand the best way to solve problems in Biology. You can get all this study material for free on studiestoday.com.

Extra Practice for Biology

To get the best results in Class 12, students should try the Biology MCQ Test for this chapter. We have also provided printable assignments for Class 12 Biology on our website. Regular practice will help you feel more confident and get higher marks in CBSE examinations.

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

You can download the teacher-verified PDF for CBSE Class 12 Biology Worksheet Set I Solved from StudiesToday.com. These practice sheets for Class 12 Biology are designed as per the latest CBSE academic session.

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

Yes, our CBSE Class 12 Biology Worksheet Set I 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.

Do you provide solved answers for CBSE Class 12 Biology Worksheet Set I Solved?

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

How does solving CBSE Class 12 Biology Worksheet Set I 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.

Is there any charge for the Class 12 Biology practice test papers?

All our Class 12 Biology practice test papers and worksheets are available for free download in mobile-friendly PDF format. You can access CBSE Class 12 Biology Worksheet Set I Solved without any registration.