EVERYDAY SCIENCE

Detailed explanation-1: -Answer: Carbon dioxide, water vapour and oxygen are the gaseous waste products excreted by plants through the ‘stomata’ in leaves and ‘lenticels’. Carbon dioxide and water vapour are excreted during respiration, while oxygen is excreted as a by-product during photosynthesis.

Detailed explanation-2: -Excretion of gaseous waste in plants takes place through stomatal pores on leaves. Oxygen released during photosynthesis is used for respiration while carbon dioxide released during respiration is used for photosynthesis.

Detailed explanation-3: -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-4: -Carbon dioxide is a gas found in the air; plants can take in this gas through tiny holes in their leaves. Once they have water and carbon dioxide, they can use energy from sunlight to make their food. The leftovers from making the plant food is another gas called oxygen.

Detailed explanation-5: -Carbon dioxide molecule diffusion occurs through the stomata of the leaves. It is then utilized by the leaves for the process of photosynthesis.