Question

7. Explain in your own words withsuitable examples.
a. What is meant by coordination?
b. How does excretion occur in humanbeings?
c. How is excretion in plants useful tohuman beings?
d. Describe the transportation systemin plants.​

Answer 1

Answer:

Excretion in plants results in the production of various kinds of excreta which are waste for the plant but are equally important for human use. The following examples are helpful in proving the above fact:

1. Oxygen which is an excretory product of photosynthesis is an absolute requirement for human beings to survive on earth.

2. Tannin is a waste plant product which is stored in leaves and bark. it is used in making tea all over the world.

3. Plants store waste products in their leaves and barks which are shed off regularly. These shed offs are used to make manure.

4. Essential oils are also waste products of plants which are stored in their leaves. These essential oils are used for various purposes by us.

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Answer 2

a)The process of organizing people or groups so that they work together properly and well.

b)In human beings, excretion is performed by the excretory system consisting of a pair of kidneys, a pair of ureters, a urinary bladder and urethra. The urine is formed in kidneys and passes on to the urinary bladder via the ureters.

c)Excretion in plants results in the production of various kinds of excreta which are waste for the plant but are equally important for human use. ... Plants store waste products in their leaves and barks which are shed off regularly. These shed offs are used to make manure.

d)The transport system in plants consists of bundles of tubes in the stem, branches and roots. These tubes are called xylem and phloem. The main function of xylem is to transport water and dissolved minerals from the roots to rest of the plant body.