EVERYDAY SCIENCE

SCIENCE

BOTANY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the leaf structure that is located mostly in the lower epidermis? When open, it allows for gas exchange, letting CO2 in and O2 to exit the leaf. When closed it also minimizes water loss.
A
Xylem
B
Stoma
C
Phloem
D
Spongy mesophyll
E
Guard cells
Explanation: 

Detailed explanation-1: -Stomata are usually present on the lower epidermis. In order to minimize transpiration that occurs with gas exchange, most dicot plants have their stomata on the lower epidermis.

Detailed explanation-2: -There are holes found in leaves called stoma. These holes allows gases to diffuse in and out of the leaves. The stoma are formed by two highly specialized epidermis cells. These cells, called guard cells, are the only epidermis cells that contain chloroplasts.

Detailed explanation-3: -The gas exchange in plants takes place through stomata, and the process is called diffusion.

Detailed explanation-4: -Carbon dioxide and oxygen cannot pass through the cuticle, but move in and out of leaves through openings called stomata (stoma = “hole"). Guard cells control the opening and closing of stomata. When stomata are open to allow gases to cross the leaf surface, the plant loses water vapor to the atmosphere.

Detailed explanation-5: -The stomata are small holes/pores in a leaf that are surrounded by a pair of guard cells that open and close the stomata, regulating how much carbon dioxide the plant receives and how much water the plant loses.

There is 1 question to complete.