U Q18. In some plants like desert plants, epidermis has a thick waxy coating of cutin (chemical substance with waterproof quality) on its outer surface. TRUE or FALSE ?
А A TRUE B FALSE Q19. A strip of secondary meristem is located in which forms ?
Answers
Explanation:
The main adaptation of desert plants is to minimize water loss.
In desert plants, this waxy coating is cutin.
-It also protects the plant against mechanical injury and invasion by parasitic fungi.
-Cutin is a waxy water-repellent substance in the cuticle of plants, consisting of highly polymerized esters of fatty acids. They help desert plants retain moisture for long periods of time.
-Thick cuticle, sunken stomata, fewer stomata, less exposed surface, increased water storage, long vertical root, etc ensures their survival in dry conditions.
Answer:
Q18.
The main adaptations of desert plants is to minimise the water loss ,hence layer of cutin is present on epidermis.which is a thick waxy coating.This waxy coating is helps in minimising water loss by transpiration.
Q19.
A plants grow older the outer protective tissue
undergoes certain changes.A strip of secondary meristem located in the cortex forms layers of cells which constitute the cork.cells of cork are dead and compactly arranged in the intercellular spaces