Which of the endocrine glands secretes the adrenaline hormone?

Adrenal glands.
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What are the two modes of coordination found in multicellular animals?

(1) Chemical coordination (2) Nervous coordination.
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Mention the receptors for light and sound in animals.


Animals receive a variety of external information through specialized structures called sense organs or receptors. These are:
(i) Photoreceptors: They receive light.
(ii) Phonoreceptors: They receive sound.

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Name multicellular organisms in which coordination is achieved only by means of chemicals.

Plants.
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Secretion of which hormones  in too little quantity than required causes diabetes?

Insulin.
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