Question

How do leaves of plants help in excretion?
A. Plants store waste materials in the vacuoles of mesophyll cells and epidermal cells.
B. When old leaves fall, the waste materials are excreted along with the leaves.
C. Both A and B
D. Plants release the waste material by transpiration.

Answer 1

Hint: Excretion: It is the process of removal of waste product out from the body of plants, animals and other organisms.
Excretion can occur through skin, lungs and kidney etc.
Excretion is an essential process in all forms of living organisms.
For example, in mammals urine is removed through the urethra, which is part of the excretory system.

Complete answer:
Excretion is the removal or spelling out of the waste product from the body of plants, animals or organisms.
It is an essential life process.
In human beings excretion occurs through an excretory system whereas in unicellular organisms excretion can occur through the cell surface.
Plants produce carbon dioxide and water as respiratory products.
In green plants, the carbon dioxide released during photosynthesis.
Oxygen is a by-product released during the process of photosynthesis, and which exits through stomata, root cell walls, and other routes.
With the help of transpiration plants water can be clear from it.
In the pre-abscission phase, the metabolic levels of a leaf are high.
Plants also excrete some waste substances into the soil and around them.
Many plants store waste materials in the vacuoles of mesophyll cells and epidermal cells.
When old leaves fall, the waste materials of plants are also excreted along with the leaves.

So, the correct option is option C. Both A and B.

Note:
In animals, carbon dioxide, ammonia, urea, and uric acids are the main excretory products.
The liver and kidneys are the excretory system that clear many substances from the blood and the cleared substances are then excreted from the body in the form of urine and feces.