Question

What is 'R' and 'S' in the above question ?

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Answer 1

Answer:

P is spines

R is stem

And this Question is realted to cactus plant..

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Answer 2

Answer:

a is cactus

p is spines

q is transpiration

r is stomata

s is cutin

t is suberin

u is transpiration

Explanation:

photosynthesis in cactus occurs at night in stomata because during day time , open stomata leads to water loss by transpiration

s is cutin which is a layer in the epidermal cells , made up of suberin , which is thick oil like substance that prevents water loss by transpiration.