Chapter 22, Problem 20A

Summary Introduction

Introduction:

The roots are mostly the first structure to arise from a seed. It is involvedin the absorption of minerals and water from the soil for transportation to the other parts of plants.

Answer to Problem 20A

Correct answer:

The correct answer is option (D) stomata.

Explanation of Solution

Explanation/justification for the correct answer:

Option (D) stomata. Stomata are found in leaves that are involved in photosynthesis. They are the small opening through which the water, carbon dioxide, oxygen, and other gases pass. It is not a part of the root.So, the correct answer is option (D).

Explanation for incorrect answer:

Option (A)endodermis. The endodermis is a part of the cell wall and consists of a waterproof strip termed as the Casparian strip. This is a part of the root. So, this is an incorrect option.

Option (B) root cap. The root cap has parenchyma cells for the protection of root tissue during its growth. The root cap hasmany layers like the epidermal layer and cortex. It is made of ground tissues, it is found between the epidermis and vascular tissue of the root. So, this is an incorrect option.

Option (C) pericycle. The pericycle is found next to the epidermis towards the center of the root. This tissue is involved in the formation of lateral roots. So, this is an incorrect answer.