physiology of plants, humans and animals - Category wise Question and Answer Practice Test with Solutions

physiology of plants, humans and animals PRACTICE TEST [6 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

Question : 26

Which part of human brain is concerned with the regulation of body temperature?

a) Cerebrum

b) Cerebellum

c) Hypothalamus

d) Medulla Oblongata

Answer: (c)

Question : 27

Bone matrix is rich in

a) Calcium and Potassium

b) Calcium and Phosphorus

c) Fluoride and Calcium

d) Phosphorus and Potassium

Answer: (b)

The matrix comprises the major constituents of bone. It has inorganic and organic parts. The inorganic part is mainly crystalline mineral salts and calcium, which are present in the form of hydroxyapatite.

The matrix is initially laid down as unmineralized osteoid. Mineralisation involves osteoblasts secreting vesicles containing alkaline phosphatase.

This cleaves the phosphate groups and acts as the foci for calcium and phosphate deposition.

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