CBSE Class 12 Biology Organisms And Populations Worksheet

CBSE Class 12 Biology Organisms and Populations. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

1.Identify the curves ‘a’ and ‘b’ shown in the graph given below. List the conditions responsible for growth patterns ‘a’ and ‘b’.

Class_12_Biology _Worksheet_3

2 Why and when do some animals like frogs hibernate?

3 Mention any two significant roles predation plays in nature?

4 Why is the polar region not a suitable habitat for tiny humming birds?

5 Name the type of interaction seen between whale and the barnacles growing on its back.


6 Name the interaction in each of the following:

a. Cuckoo lays her eggs in the crow’s nest

b. Orchid grows on a mango tree

c. Ticks live on the skin of dogs.

7 Certain species of wasps are seen to frequently visit flowering fig trees. What type of interaction is seen between them and why?

8 Egrets are often seen along with grazing cattle. How do you refer to this interaction? Give a reason for this association.

9 a) What is “r” in the population equation given below: dN/dt=rN

b) How does the increase and decrease in the value of ‘r’ affect the population size?

10 How does the Mediterranean orchid Ophrys ensure its pollination by bees?

11 a) How is cuscuta adapted to be a parasitic plant?

b) Why do cattle avoid browsing on Calotropis plants? Explain.

d. Sea anemone is often found on the shell of hermit crab. 

13 Why is predation required in a community of different organisms?

Please click the link below to download full pdf file for CBSE Class 12 Biology Organisms and Populations.



Click to View or Download pdf file
Click for more Biology Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

TV Channels for Students by CBSE

In enhancing the students studying part, the Government is planning to introduce one standard one channel plan. The lockdown in India has adversely collapsed all the operations including schools, colleges, and workplaces with unanticipated setbacks. On behalf of the...

Board Exams Class 10 and Class 12 Datesheet 2020

CBSE has announced the datesheet for the remaining exams of class 10 and class 12 exams. The exams are going to start in July. The class 10 and 12th board exams will be conducted for the remaining 29 papers from July 1 to July 15, 2020, at various centers nominated by...

Class 10 Board Exams to be held

The CBSE board has announced that there is no change in the decision of conducting the CBSE board exams for the 29 subjects, which were canceled due to coronavirus crisis. So when the lockdown gets relaxed completely, the board will conduct the exams for the students,...

CBSE Boards Answer Sheet Evaluation Class 10 and Class 12

HRD Minister Ramesh Pokhriyal, through a video conference with all the education ministers of the state, discussed the further steps to be taken to smoothen the education process during the Covid-19 lockdown. The most important topic which was discussed repeatedly on...

Board Cancelled Official CBSE Statement

Keeping in view the requests received from various State Governments and the changed circumstances as on date, following has been decided- 1. Examinations for classes X and XII which were scheduled from 1st July to 15th, 2020 stand cancelled. 2. Assessment of the...

Studies Today