Biology | Study Mode

Question 21

The most likely mode of an organism that possesses attachment structure, thin outer surface layer and absence of an elaborate digestive tract is

Autotropic

holophytic

parasitic

saprophytic

symbiotic

Explanation

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Correct option: C

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Question 22

Which one is NOT an excretory product of man?

carbon(iv)oxide

oxygen

nitrogenous wastes

salts

respiration

Explanation

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Correct option: B

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Question 23

Which structure of the mammalian ear when removed will affect the maintenance of balance?

auditory canal

ear ossicles

pinna

semi-circular canals

tympanium

Explanation

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Correct option: D

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Question 24

Which of the following agricultural practices will NOT promote soil conservation ?

afforestation

bush burning

crop rotation

manuring

mulching

Explanation

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Correct option: B

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Question 25

The group of micro-organisms that plays a vital role in the baking industry is

algae

bacteria

fungi

protozoa

viruses

Explanation

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Correct option: C

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Question 26

An instrument of measuring wind speed is called

an anemometer

a barometer

a hygrometer

a speedometer

a thermometer

Explanation

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Correct option: A

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Question 27

Which of these traits shows discontinuous variation ?

ability to roll the tongue

colour of hair

height of stem

size of girth

weight of organism

Explanation

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Correct option: A

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Question 28

An example of a conditioned reflex is

blinking of the eye-lids

shout of exclamation

knee jerk

riding a bicycle

twitching of facial muscles

Explanation

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Correct option: D

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Question 29

Which of these is a liming factor with respect to human population size?

emigration

high standard of living

immigration

improved medicare

natality

Explanation

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Correct option: A

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Question 30

An essential element whose deficiency in plants will result in poor growth, particularly of the roots, and is essential for cell well formation is

calcium

iron

magnesium

nitrogen

phosphorus

Explanation

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Correct option: A

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