Question

1. Plants and animals both have to deal with water balance and removal of toxins or solutes from their bodies. Explain how these materials are removed from the body in plants and animals and how water is conserved when necessary. Compare and contrast their processes.

Answer 1

Excretion is the removal of waste from the body. ... They do not have any special organ for the removal of their waste product. The waste products of a plant are carbon dioxide, water vapour and oxygen. While carbon dioxide and water vapour are waste products of respiration, oxygen is a waste product of photosynthesis.

Organ of excretion - The leaf. Unlike animals, plants do not have specialised excretory organs. Excess carbon dioxide and oxygen are excreted from the plant through the stomata in the leaves.

Water conservation- Some arid-climate plants are able to conserve water because of their reduced leaf size. Less leaf surface area results in reduced water loss through the epidermis. Small leaves have fewer stomata than larger leaves, and that adaptation also reduces water loss.

You remove waste as a gas (carbon dioxide), as a liquid (urine and sweat), and as a solid. Excretion is the process of removing wastes and excess water from the body. Recall that carbon dioxide travels through the blood and is transferred to the lungs where it is exhaled. ... Therefore, your urine gets darker than usual.

Organ of excretion: Kidney,skin,lungs etc.

Water conservation: The kidneys can regulate water levels in the body; they conserve water if you are dehydrated, and they can make urine more dilute to expel excess water if necessary. Water is lost through the skin through evaporation from the skin surface without overt sweating and from air expelled from the lungs.