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Q:

Which of the following statements about enzymes is not true?

A) all enzymes have the same shape as their substrates B) enzymes are proteins
C) enzymes work best at a specified ph D) the shape of an enzyme allows it to do its job
 
Answer & Explanation Answer: A) all enzymes have the same shape as their substrates

Explanation:

All enzymes have the same shape as their substrates is the FALSE statement regarding enzymes.

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Q:

In roots, the protoxylem lies towards periphery and metaxylem lies towards the centre. Such arrangement of primary xylem is called ____________.

A) Xylem fibres B) Xylem parenchyma
C) Exarch D) Endarch
 
Answer & Explanation Answer: C) Exarch

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Q:

Which of the following is a risk factor for osteoporosis?

A) Smoking cigarettes B) Drinking alcohol
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

Osteoporosis makes you more likely to loss bone mass and density resulting in fractures. Smoking cigarettes and drinking alcohol can lead to loss bone mass and density. Oseoporosis is more common in women than men.

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Q:

The study of relation of animals and plants to their surroundings is called__________

A) Ecology B) Ethrology
C) Genealogy D) Iconology
 
Answer & Explanation Answer: A) Ecology

Explanation:
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Q:

Which cell disorder in our body is responsible for colour blindness?

A) WBC B) Cone cell
C) Rod Cell D) Neuron
 
Answer & Explanation Answer: B) Cone cell

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Q:

Part of the plant where photosynthesis generally occurs

A) roots B) leaves
C) branches D) flowers
 
Answer & Explanation Answer: B) leaves

Explanation:

In a plant, photosynthesis generally occurs in the leaves part as leaves have chlorophyll which is used for making food using sunlight.

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Q:

Pellagra and Scurvy are caused by which pair of vitamin deficiency respectively _______________

A) VitaminC and VitaminD B) VitaminB-12 and VitaminC
C) VitaminC and VitaminA D) Vitamin A and VitaminB-12
 
Answer & Explanation Answer: B) VitaminB-12 and VitaminC

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Q:

The right portion of human heart receives ______ blood.

A) pure B) impure
C) mixed D) none
 
Answer & Explanation Answer: B) impure

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