Chapter 8, Problem 19A

Summary Introduction

Introduction :

Chloroplast are disc-shaped organelles that contain two compartments essential to photosynthesis. The first compartment is called the thylakoid. Thylakoids are flattened sac-like membranes that are arranged in stacks called grana. Light-dependent reactions take place within the thylakoids.

Answer to Problem 19A

Correct answer :

The correct answer is option (A) thylakoids.

Explanation of Solution

Explanation/justification for the correct answer :

Option (A) Thylakoids. The inner membrane of the chloroplast are folded and arranged into flattened sacs called as thylakoids. The Thylakoids arranged into stacks are called grana in which light reactions occurs. Thus, the correct answer is an option (A).

The explanation for the incorrect answer :

Option (B) mitochondria. The inner membrane of the folded like fingers called oxysomes or respiratory particles. Thus, this is an incorrect option.

Option (C) theca. Theca is referred to sheath or covering. Thus, this is an incorrect answer.

Option (D) stroma. Within the inner membrane of the chloroplast, alkaline aqueous fluid ground substance is present called stroma or matrix. It is rich in protein and contains enzymes for reduction of the carbon dioxide into glucose. Thus, this is an incorrect answer.