CBSE-COMPARTMENT-XII SERIES Biology
Ecosystems
2 previous year questions.
Volume: 2 Ques
Yield: Medium
High-Yield Trend
2
2025 Chapter Questions 2 MCQs
01
PYQ 2025
medium
biology ID: cbse-com
How many billion tons productivity of oceans?
1
55
2
70
3
155
4
170
02
PYQ 2025
medium
biology ID: cbse-com
Assertion (A): Gross primary productivity is always less than net primary productivity.
Reason (R): Rate of synthesis of organic matter by consumers is known as secondary productivity.
Reason (R): Rate of synthesis of organic matter by consumers is known as secondary productivity.
1
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3
Assertion (A) is true, but Reason (R) is false.
4
Assertion (A) is false, but Reason (R) is true.
About Ecosystems - CBSE-COMPARTMENT-XII
Ecosystems is a vital chapter for CBSE-COMPARTMENT-XII aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Ecosystems PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Ecosystems carry the most weight. Then, tackle the questions iteratively to solidify your understanding.