CBSE Class 12 Biology Ecosystem Worksheet Set A

CBSE Class 12 Biology Ecosystem (1). 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 What does the base tier of the ecological pyramid represent?

2 In the North East region of India, during the process of jhum cultivation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological term?

3 Climax stage is achieved quickly in secondary succession as compared to primary succession. Why?

4 Why are oceans least productive?

5 Organisms at a higher trophic level have less energy available. Comment.

6 What are the shortcomings of ecological pyramids in the study of ecosystem?

7 How do you distinguish between humification and mineralisation?

8 List three parameters used for constructing ecological pyramids. Describe any one instance where the pyramid may look inverted.

9 Differentiate between a detritivore and a decomposer giving an example of each.

10 Construct an ideal pyramid of energy when 1,00,000 joules of sunlight is available. Label all its trophic levels.

11 Construct a pyramid of biomass starting with phytoplanktons. Label 3 trophic levels. Is the pyramid upright or inverted? Why?

12 Explain with the help of two examples how the pyramid of number and the pyramid of biomass can look inverted.

13 Justify the given statements:

a) Energy flow in an ecosystem is unidirectional

b) Secondary succession is faster than primary succession

14 What will happen to an ecosystem if:

a) All producers are removed

b) All organisms of herbivore level are eliminated

c) All top carnivore population is removed 

Please click the link below to download full pdf file for CBSE Class 12 Biology Ecosystem (1).

Tags: 

 


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

Board Exams helpline by CBSE

According to the recent announcement of CBSE, the pending Class 10 and 12 Board exams are going to be held from 01 July to 15 July 2020 in India. Along with this, it has also been decided to resume the free of cost tele-counseling service for students from 9.30 am to 5...

CBSE Board Exams in July Press Release

CBSE has released press note for the dates for the CBSE Board exams for Class 10. CBSE said “With regards to conduct of Class X examinations several queries are being received by the CBSE. In this context, it is once again reiterated that remaining examinations of...

Class 12 Board Exams Datesheet Announced

CBSE has announced the datesheet of the remaining class 12 board exams, see below:  

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...

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...

×
Studies Today