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Exercise:

Section 1

► Section 2

01. Most of the red, blue and purple colours of plants are due to a pigment called
A. anthocyanin B. carotene
C. chlorophyll D. xanthophylls

Answer and Explanation

Answer: anthocyanin

Explanation:
A blue, violet, or red flavonoid pigment found in plants.

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02. Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
A. flavoxanthin B. melanin
C. carotene D. Xanthophyll

Answer and Explanation

Answer: melanin

Explanation:
There is no explanation...

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03. Plants that grow under average temperature and moisture are called
A. halophytes B. hydrophytes
C. mesophytes D. xerophytes

Answer and Explanation

Answer: mesophytes

Explanation:
There is no explanation...

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04. Mumps is a disease caused by
A. fungus B. bacterium
C. virus D. None of these

Answer and Explanation

Answer: virus

Explanation:
There is no explanation...

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05. Radioactivity is a phenomenon of the spontaneous emission of
A. protons (alpha particles) B. electrons (beta particles)
C. gamma rays (short wave electromagnetic waves) D. All of the above

Answer and Explanation

Answer: All of the above

Explanation:
There is no explanation...

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06. Pollination by wind is called
A. anemophily B. hydrophily
C. zoophily D. entomophily

Answer and Explanation

Answer: anemophily

Explanation:
There is no explanation...

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07. Ozone hole refers to
A. hole in ozone layer B. decrease in the ozone layer in troposphere
C. decrease in thickness of ozone layer in stratosphere D. increase in the thickness of ozone layer in troposphere

Answer and Explanation

Answer: decrease in thickness of ozone layer in stratosphere

Explanation:
There is no explanation...

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08. Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by
A. Robert Hooke B. Robert Brown
C. Rudolf Virchow D. Theodore Schwann

Answer and Explanation

Answer: Robert Brown

Explanation:
There is no explanation...

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09. O2 released in the process of photosynthesis comes from
A. CO2 B. water
C. sugar D. pyruvic acid

Answer and Explanation

Answer: water

Explanation:
There is no explanation...

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10. Phloem is a tissue found in
A. reproductive organs of animals B. plants
C. insects D. mammals

Answer and Explanation

Answer: plants

Explanation:
There is no explanation...

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11. One of the following is not a function of bones.
A. Place for muscle attachment B. Protection of vital organs
C. Secretion of hormones for calcium regulation in blood and bones D. Production of blood corpuscles

Answer and Explanation

Answer: Secretion of hormones for calcium regulation in blood and bones

Explanation:
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12. The inherited traits of an organism are controlled by
A. RNA molecules B. nucleotides
C. DNA molecules D. enzymes

Answer and Explanation

Answer: DNA molecules

Explanation:
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