Question

3. What is meant by excretion? Name the various products excreted by trees and animals ​

Answer 1

Explanation:

The removal of metabolic waste products from the body of an organism is known as excretion. The major excretory products are carbon dioxide, excess water, and nitrogenous compounds like ammonia, urea, uric acid, etc. Carbon dioxide and water are produced in the process of tissue respiration.

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Answer 2

Answer:-

Meant by excretion:

• Excretion is the removal of waste mainly urea with the help of urine by kidneys.
• Proteins are digested to form amino acids and the final by-product of the degradation of ammonia is urea.
• This urea containing blood (blood filtrate) is carried from the liver to the kidneys for its final excretion as urine.

Excreted by trees:

• Plants perform photosynthesis which uses CO₂, water, sunlight, and chlorophyll to synthesize food.
• During photosynthesis, oxygen is given out as a by-product. This oxygen acts as an excretory product and is given out by a process called diffusion.
• Certain plants perform a process known as photorespiration where oxygen is taken in and CO₂ is given out as a waste product.

Excreted by animals:

• The lungs and gills are the paths for excretion of gaseous wastes,
• The kidneys or some homologous nephritic organs are the paths for excretion of urea, uric acid, ammonia and other nitrogenous compounds which are usually removed in the form of urine
• The skill also serves as an excretory organs in certain animals and is a path for excretion of some gaseous wastes and inorganic ions
• The liver also effects some excretion, chiefly of cholesterol and bile-pigments
• The intestinal epithelium of cer­tain animals also functions as an excretory organ because it excretes certain inorganic constituents which are present in excess in the body
• The salivary, mammary and tear glands up to some extent also serve as vehicles of excretion of traces of wastes and may excrete a significant amount of foreign substances.