Question

give reasons a) in a plant carbon dioxide elimination is a major exchange at night. b) the rate of breathing in aquatic organism is much faster than that of terrestrial
organism

Answer 1

Hey here is your answer
A.During the day due to the presence of sunlight plant perform the process of photosynthesis.But in night it is dark so it continue it's process of respiration like us it inhale oxygen and exhale Carbon dioxide. so in night the elimination of carbon dioxide is major exchange.
B. The aquatic organisms breath by taking the oxygen dissolved in water.The amount of oxygen is fairly low as compared to the land.So the aquatic organisms has to breathe faster in order to get more oxygen. that's all

Answer 2

A) During the day due to the presence of sunlight plant perform the process of photosynthesis.

But in night it is dark so it continue it's process of respiration like us it inhale oxygen and exhale Carbon dioxide.

B) Aquatic animals live in water and they respire with the help of oxygen dissolved in it.

The amount of oxygen on the land is high. That's why aquatic animals have to respire faster.

Hope this will helps you.......