Answer :

A.


The working together of various organs of the body of an organism in a proper manner to produce an appropriate reaction to the changes in the environment is called coordination. In humans, coordination is done by the nervous system and the endocrine system. Neurons and hormones together bring growth and movements in humans.


In plants, plant hormones such as auxin, cytokinin bring coordination.


B.


The primary components of the excretory system are the kidneys. The kidney is made of its units called nephron. When blood reaches the kidneys, nephrons filter blood. The useful substances are absorbed back into the blood, while the waste materials are dissolved in water and removed from the body in the form of urine. With the help of ureter, urinary bladder, and urethra, the urine is discharged.


C.


The excretory products of plants such as Rubber, wax, gums, resins. All these products are used by humans in their daily activities.


D.


The transport system in plants consists of xylem and phloem. Xylem transports water and minerals from the soil to the roots and from roots to every part of the plant. Phloem transports food from leaves to other parts of the plant.

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