Chapter 2, Problem 19A

Summary Introduction

Introduction :

The Sun is the ultimate source of energy on Earth. The energy coming from the Sun is captured by the green plants through photosynthesis. During photosynthesis, solar energy is fixed into chemical energy. In most of the ecosystems, energy flow only from the sun.

Answer to Problem 19A

Correct answer :

The correct answer is option (A) Energy for most of the ecosystems originate from the Sun.

Explanation of Solution

Explanation/justification for the correct answer :

Option (A) Energy for most of the ecosystems originate from the Sun. The Sun is an ultimate source of energy in an ecosystem. Energy always flows from the sun to the producers and then to the consumers. Thus, the correct answer is an option (A).

The explanation for the incorrect answer :

Option (B) 30. Energy most often is released as light from an ecosystem. Energy is released as light from the sun and not from an ecosystem. Thus, this is an incorrect option.

Option (C) Energy flows from heterotrophs to autotrophs. The energy from autotrophs is transferred to the herbivores than to carnivores through food. Thus, this is an incorrect answer.

Option (D) Energy levels increase toward the top of the food chain. In a food chain, maximum energy is available at the base (producers) level and least energy is available at the top. It means energy levels decrease toward the top of the food chain. Thus, this is an incorrect answer.