37
Q:

Damage to hearing is caused by sounds which exceed

A) 70 decibels B) 80 decibels
C) 100 decibels D) 120 decibels

Answer:   D) 120 decibels



Explanation:

High frequency sound attacks the tympanic memberance and makes it defective. 120 decibels is too high a pitch to be heard and therefore it impairs the hearing ability.

Subject: Biology
Q:

Which of the following is a metabolic function of skin?

A) synthesis of a vitamin D precursor B) cutaneous sensation
C) body temperature regulation D) elimination of nitrogenous wastes
 
Answer & Explanation Answer: A) synthesis of a vitamin D precursor

Explanation:
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Q:

By which process substance like carbon dioxide or oxygen can move across the cell membrane?

A) Plasmolysis B) Sedimentation
C) Diffusion D) Transpiration
 
Answer & Explanation Answer: C) Diffusion

Explanation:
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Q:

Which of the following is NOT included in the excretory system of human being?

A) A pair of kidney B) A pair of ureters
C) Abdomen D) Urinary bladder
 
Answer & Explanation Answer: C) Abdomen

Explanation:
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Q:

Which of the following enzymes is responsible for RNA synthesis?

A) RNA polymerase B) RNase
C) RNA ligase D) DNA polymerase
 
Answer & Explanation Answer: A) RNA polymerase

Explanation:

The enzyme that is mainly responsible for RNA synthesis is known as RNA polymerase.

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Q:

The formed elements in the blood are

A) Erythrocytes B) Leucocytes
C) Thrombocytes D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

The formed elements are so named because they are enclosed in a plasma membrane and have a definite structure and shape.

 

The formed elements in the blood are Erythrocytes (RBC's), Leukocytes (WBC's) and Thrombocytes (Platelets).

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Q:

What is the shape of the two guard cells which enclose stomata?

A) Oval B) Triangular
C) Rectangular D) Kidney shaped
 
Answer & Explanation Answer: D) Kidney shaped

Explanation:
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Q:

Match the following.

 

A) I – 2, II – 3, III – 1 B) I – 1, II – 3, III – 2
C) I – 3, II – 1, III – 2 D) I – 3, II – 2, III – 1
 
Answer & Explanation Answer: C) I – 3, II – 1, III – 2

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Q:

....... produces a usable form of energy for the cell.

A) Ribosomes B) Plastids
C) Mitochondria D) Chloroplast
 
Answer & Explanation Answer: C) Mitochondria

Explanation:

Mitochondria are organelles that generate most of the chemical energy needed to power the cell's biochemical reactions. Hence, thay are also called as Power house of the cell.

 

mitochondria1593761207.jpg image

 

* Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).

 

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