Chapter 22, Problem 2STP

Summary Introduction

Introduction:

The leaves of plants are involved in photosynthesis and the structures of the leaves are such that it is well adapted to this function. The leaves have a flattened area that is termed as the blade. It is involved in providing a large surface area. The blades of the leaves are attached to the stem with the help of a stalk that is termed as petiole.

Answer to Problem 2STP

Correct answer:

The correct answer is option (A).

Explanation of Solution

Explanation/justification for the correct answer:

Option (A) The picture represented in option A is of palisade mesophyll cells. This portion of the cell is highly exposed to the light; so, most of the photosynthesis process takes place in this cell. This cell has many chloroplasts; therefore, most of the photosynthesis process takes place in this part.So, the correct answer is option (A).

Explanation for incorrect answer:

Option (B)The picture represented in option B is of spongy mesophyll. It is found below the palisade layer spongy mesophyll tissue is found, which are rectangular, and loosely packed. The oxygen, water vapor, and carbon dioxide pass-through space. So, this is an incorrect option.

Option (C) The picture represented in option C is of an epidermal cell. This is the outermost part of a leaf that involve in the protection of plants from pathogens and environmental effects. So, this is an incorrect option.

Option (D) The picture represented in option D is of the cuticle. This is involved in the prevention of water loss in the plant. So, this is an incorrect answer.