Chapter 19, Problem 3STP

Summary Introduction

To write:

About the organelle that captures energy for the cell from sunlight.

Introduction:

Euglena is a unique single-celled organism that is both autotrophic and heterotrophic in nature.

Answer to Problem 3STP

Correct answer is Option (A).

Explanation of Solution

Explanation/justification for the correct answer

Option (A) 1. Chloroplast present in the euglena captures the sunlight and uses it for photosynthesis. They appear as rod-like structures and are numerous in number distributed throughout the body.

Explanation for the incorrect answer :

Option (B) 2. It represents the nucleus. Hence, it is an incorrect answer.

Option (C) 3. It represents a contractile vacuole that functions to remove the surplus amount of water in the reservoir that is found near the base of flagella. Hence, it is an incorrect answer.

Option (D) 4. It represents Eyespot. It is also called as stigma and has photoreceptors that detect light and play an important role in phototaxis. It is found in the gullet, i.e., at the base of the flagellum. Hence, it is an incorrect answer.