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Q:

Monocarpic plants are those that produce fruits ...............during the life of the plant

A) once	B) thrice
C) many times	D) twice

Answer & Explanation Answer: A) once

Explanation:

Plants are of different types. Some grow well and then produce fruits before they die. In other words they fruit only once in their life. Such plants are said to be monocarpic. Other plants produce fruits every season. These are called polycarpic plants.

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Filed Under: Biology

Q:

The enzyme that is necessary to bring about clotting of blood is

A) peptidase	B) amylase
C) lipase	D) thrombokinase

Answer & Explanation Answer: D) thrombokinase

Explanation:

The clotting of blood is a chain reaction initiated by the enzyme Thrombokinase produced by the platelets. This causes Prothrombin and calcium salts in plasma to join and produce thrombin. Thrombin combines with Fibrinogen to produce Fibrin threads which entangles the corpuscles to create a clot.

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Filed Under: Biology

Q:

The grouping of blood is based on substances called

A) antibodies	B) antigens
C) antitoxin	D) enzymes

Answer & Explanation Answer: B) antigens

Explanation:

The red blood corpuscles or erythrocytes usually carry antigens and there are two types of antigens. The A group persons have antigen A in their red corpuscles and the B group have antigen B in their red corpuscles. The AB group person have both antigen A and antigen B in their erythrocytes. The 'O' group persons have no antigens in their red corpuscles.

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Filed Under: Biology

Q:

The enzyme that is necessary to bring about clotting of blood is

A) peptidase	B) amylase
C) lipase	D) thrombokinase

Answer & Explanation Answer: D) thrombokinase

Explanation:

The clotting of blood is a chain reaction initiated by the enzyme thrombokinase produced by the platelets. This causes prothrombin to be converted into thrombin in the presence of $C a^{+ +}$ ion.

Thrombin combines with fibrinogen to produce fibrin threads which entangles the corpuscles to form the clot.

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Filed Under: Biology
Exam Prep: AIEEE , GATE

Q:

Which of the following plays an important part in photosynthesis?

A) Chloroplast	B) Centrosome
C) Tonoplast	D) Nematoblast

Answer & Explanation Answer: A) Chloroplast

Explanation:

The Chloroplast contains the wonder green pigment chlorophyll which is able to trap solar energy and use it for synthesis of food

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Filed Under: Biology

Q:

Which of the following organelle is known as the 'Power House' of the cell?

A) Golgi Bodies	B) Ribosomes
C) Mitochondria	D) None of these

Answer & Explanation Answer: C) Mitochondria

Explanation:

Mitochondria are known as 'Power House' of the cell because they produce energy in the form of ATP.

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Filed Under: Biology

Q:

The soaps used in shaving cream are

A) Calcium soaps	B) lead soaps
C) soft soaps	D) hard soaps

Answer & Explanation Answer: C) soft soaps

Explanation:

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Filed Under: Chemistry

Q:

In the making of jewels, gold is usually mixed with

A) zinc	B) tin
C) copper	D) aluminium

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