Rajasthan Board Class 10 (RBSE) Our Environment — practice questions — page 2

Explore 33 free Our Environment questions in Rajasthan Board Class 10 (RBSE) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Our Environment questions and exercises with answers

Showing questions 31–33 of 33.

In a food chain "Grass → Deer → Tiger", which trophic level has the LEAST energy available?Read the answer and worked solution →The flow chart "Sun → producer → consumer → decomposer" describes:Read the answer and worked solution →Rule on these claims about a food chainRead the answer and worked solution →

Worked practice questions

In a food chain "Grass → Deer → Tiger", which trophic level has the LEAST energy available?

Deer
Tiger
Grass
All equal

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Correct answer: B. Tiger

1. Each trophic transfer loses ~90% of incoming energy. 2. Tiger is at the highest level here, so it receives the smallest remaining fraction. 3. Hence Tiger has the least usable energy. _Source: syllabus Science, Ch 13 "Our Environment", §13.1.1_

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The flow chart "Sun → producer → consumer → decomposer" describes:

Photosynthesis only
A cyclical nutrient flow (option)
Atmospheric refraction
One-way flow of energy through an ecosystem

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Correct answer: D. One-way flow of energy through an ecosystem

1. Solar energy is captured by producers. 2. It is passed up the consumer chain and finally to decomposers. 3. Energy is dissipated as heat at each step; flow does not reverse. _Source: syllabus Science, Ch 13 "Our Environment", §13.1.1_

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Rule on these claims about a food chain

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Questions

Statement is true
Yes
Statement
Green plants in an ecosystem are the producers.
Statement is true
No
Statement
Bacteria and fungi that break down dead remains are consumers.
Statement is true
Yes
Statement
About ten percent of energy moves to the next trophic level.
Statement is true
No
Statement
Energy in a food chain flows up and then back down again.
Statement is true
Yes
Statement
Food chains rarely run beyond three or four steps.
Statement is true
No
Statement
Plastic bags are broken down quickly by microbes.
Statement is true
Yes
Statement
The ozone layer absorbs harmful ultraviolet radiation.

Instructions

Tap true or false for each claim about who eats whom and how energy moves along.

_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch15 'Our Environment', §15.1.1_

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