#energy flow

BOTANY

Which of the following correctly describes the movement of energy in an ecosystem?

Energy flow in an ecosystem is unidirectional, moving from producers to consumers and eventually lost as heat. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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Nutrient Cycling - Carbon Phosphorus and Ecological Succession

Which of the following best describes an ecological pyramid?

Ecological pyramids represent the relative number, biomass, or energy of organisms at different trophic levels in an ecosystem.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Nutrient Cycling - Carbon Phosphorus and Ecological Succession

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Ecological Pyramids - Number Biomass Energy

Why is the pyramid of energy always upright?

The pyramid of energy is always upright because energy is lost as heat at each trophic level according to the second law of thermodynamics.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecological Pyramids - Number Biomass Energy

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Ecological Pyramids - Number Biomass Energy

What is the main function of ecological pyramids?

Ecological pyramids represent the relative amount of energy, biomass, or number of organisms at different trophic levels in an ecosystem.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecological Pyramids - Number Biomass Energy

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Energy Flow - Food Chains Food Webs Trophic Levels

Which of the following correctly describes the movement of energy in an ecosystem?

Energy flow in an ecosystem is unidirectional, moving from producers to consumers and eventually lost as heat.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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Energy Flow - Food Chains Food Webs Trophic Levels

Which of the following statements about energy flow in an ecosystem is correct?

Energy flows in a unidirectional manner from producers to consumers and is eventually lost as heat.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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Energy Flow - Food Chains Food Webs Trophic Levels

Which of the following statements about energy flow in an ecosystem is correct?

Energy flow in an ecosystem is unidirectional, moving from producers to consumers and eventually lost as heat.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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Energy Flow - Food Chains Food Webs Trophic Levels

Which statement about energy flow in an ecosystem is correct?

Energy flow in an ecosystem is unidirectional, moving from producers to consumers and eventually lost as heat.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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Energy Flow - Food Chains Food Webs Trophic Levels

Which of the following represents a grazing food chain?

A grazing food chain begins with producers (plants) and moves up to herbivores (goat) and then to carnivores (man).

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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Energy Flow - Food Chains Food Webs Trophic Levels

What is the primary source of energy in most ecosystems?

Solar energy is the primary source of energy for most ecosystems, driving photosynthesis and energy flow through food chains.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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Energy Flow - Food Chains Food Webs Trophic Levels

Which of the following statements about energy flow in an ecosystem is incorrect?

Not all energy is transferred between trophic levels; most is lost as heat during metabolic processes.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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Energy Flow - Food Chains Food Webs Trophic Levels

Which of the following statements about energy flow in an ecosystem is incorrect?

Energy transfer between trophic levels is not 100% efficient; most energy is lost as heat.

Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Energy Flow - Food Chains Food Webs Trophic Levels

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