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Q:

Plants grow in size because of

A) addition of cells	B) increase in size of cells
C) enlargement of cells	D) elongation of cells

Answer & Explanation Answer: A) addition of cells

Explanation:

Plants grow in size both in height and in girth. Enlargement of cells already present cannnot contribute much to the growth. Only addition of more and more cells could increase the size of the plant considerably.

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Filed Under: Biology

Q:

The rate of heartbeat is accelerated by the hormone

A) adrenaline	B) acetylcholine
C) thyroxine	D) pituitrin

Answer & Explanation Answer: A) adrenaline

Explanation:

The hormone adrenaline also called epinephrine is known as a stress hormone. In emotional upsets( like fear, anger etc.) this hormone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.

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Filed Under: Biology

Q:

The insects do not have blood pigments because

A) there is no blood	B) blood does not have a respirratory function
C) tissues have pigments	D) pigments are elsewhere

Answer & Explanation Answer: B) blood does not have a respirratory function

Explanation:

The blood of some invertebrate animals like the earthworm is red due to haemoglobin pigment, but the pigment is dissolved in the plasma. In vertebrates the same pigment is found in the red corpuscles and not in the plasma.

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Filed Under: Biology

Q:

Infection of salivary glands by a virus leads to

A) tetanus	B) mumps
C) pyorrhoea	D) ulcers

Answer & Explanation Answer: B) mumps

Explanation:

Mumps : This is a swelling caused by information of parotid glands placed in front of our ear region. The inflammation is caused by a virus.

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Filed Under: Biology

Q:

Man has _____ pairs of salivary glands

A) 3	B) 4
C) 6	D) 8

Answer & Explanation Answer: A) 3

Explanation:

Salivary glands of man are 3 pairs = 6. They are one pair of parotid glands, one pair of sub-maxillary or sub-mandibular glands and one pair of sub-lingual glands.

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Filed Under: Biology

Q:

In addition to nitric acid, another acid which may render iron passive is

A) acetic acid	B) oxalic acid
C) chromic acid	D) citric acid

Answer & Explanation Answer: C) chromic acid

Explanation:

Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide $[F e_{3} (O_{4})]$ on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.

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Filed Under: Chemistry

Q:

Which of the following is used to preserve specimens in the biology laboratory?

A) Phenol	B) Benzaldehyde
C) Formaldehyde	D) Acetic acid

Answer & Explanation Answer: C) Formaldehyde

Explanation:

A 40% solution of Formaldehyde known as Formalin is used in the preservation of biological specimens because of its hardening action on proteins.

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Filed Under: Chemistry

Q:

PAS is a drug used in the treatment of

A) tuberculosis	B) Cancer
C) typhoid	D) malaria

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