Ecology, Ecosystem and Functions of Ecosystem: UPSC Previous Year Questions (Environment and Ecology)
1 previous year UPSC Prelims question on Ecology, Ecosystem and Functions of Ecosystem (Environment and Ecology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 2022Environment and Ecology · Ecology, Ecosystem and Functions of Ecosystem
Q1. Which of the following are nitrogen-fixing plants? 1. Alfalfa 2. Amaranth 3. Chickpea 4. Clover 5. Purslane (Kulfa) 6. Spinach Select the correct answer using the code given below:
Explanation
Alfalfa, chickpea, and clover are nitrogen-fixing plants. They belong to the leguminous family and form symbiotic associations with Rhizobium bacteria in their root nodules, aiding in nitrogen fixation and enriching soil fertility. Amaranth, purslane (Kulfa), and spinach, are non-legumi-nous plants and lack the ability to fix nitrogen as they do not form symbiotic relationships with nitrogen-fixing bacteria or develop root nodules. This natural ability of legumes like alfalfa, chickpea, and clover to fix nitrogen is extensively utilized in crop rotation practices to replenish soil nutrients and enhance agricultural productivity.
Answer key for these questions
Q
UPSC year
Correct answer
1
2022
(a) 1, 3 and 4 only
Frequently asked questions
How many previous year UPSC questions are there on Ecology, Ecosystem and Functions of Ecosystem?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Ecology, Ecosystem and Functions of Ecosystem (Environment and Ecology), asked from 1996 to 2025. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Ecology, Ecosystem and Functions of Ecosystem?
Questions on Ecology, Ecosystem and Functions of Ecosystem (Environment and Ecology) are available for 12 years, from 1996 to 2025. Use the Year filter to practise a single paper.
