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Two tall plants, each being a hybrid and carrying a recessive factor for dwarfness are crossed. What proportion of their offspring will be dwarf?

A. 0.5

B. 0.25

C. 0.75

D. 1

Correct Answer :

B. 0.25


Related Questions

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Aphids are

A. insect pests

B. fungal pests

C. bacterial pests

D. viral pests

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4

Oparin is known for his hypothesis on

A. origin of species

B. origin of life

C. one germ one disease

D. one gene one enzyme

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4

The external ears of man are intended for

A. ornaments

B. scattering sound waves

C. collect sound waves

D. beauty

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4

What is an antigen?

A. toxic substance

B. a kind of protein

C. blood platelets

D. blood corpuscles

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4

Mouth and foot diseases in cattle are caused by

A. Bacteria

B. Virus

C. Fungi

D. Pennicilium

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4

The hypoglossal nerves are the pairs of the spinal nerves

A. First pair

B. Second pair

C. Third pair

D. Fourth pair

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4

Blood of cockroach is

A. red

B. bluish

C. greenish

D. colourless

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4

A child goes on vomiting profusely and develops symptoms of diarrhoea. Chances are that in the child's blood serum there is a drop In

A. calcium

B. iron

C. sodium

D. phosphorus

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4

If a father has blood group A and the mother has blood group 0, which one of the blood groups may be found in their progeny?

A. A

B. AB

C. O

D. Both (a) and (c)

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4

Which one of the following acts as a communication system?

A. Blood

B. Nerve

C. Lymph

D. Enzymes

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4

The aphotic zone means that light is

A. always present

B. present during day

C. always absent

D. present during night

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4

Clotting of blood is

A. a chain reaction

B. reversible reaction

C. reflex action

D. no reaction

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4

Mendel chose for his experiments the plant

A. Bean

B. Pea

C. Cucumber

D. Rose

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4

The disease in which blood clotting does not take place is known as

A. xerophthalmia

B. haemopoiesis

C. haemophilia

D. haemoerythrin

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4

The cavities of the brain are filled with

A. Blood

B. Lymph

C. Water

D. Cerebrospinal fluid

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4

Fibrinogen is present in

A. lymph

B. liver

C. blood plasma

D. pancreas

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4

Insulin is concerned with the metabolism of

A. sugar

B. fats

C. proteins

D. vitamins

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4

The pathogenic organisms of an infected person are destroyed by the action of

A. erythrocytes

B. leucocytes

C. blood platelets

D. all of these

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4

The normal systolic blood pressure is

A. 140

B. 120

C. 180

D. 80

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4

Damage to hearing is caused by sounds which exceed

A. 70 decibels

B. 80 decibels

C. 100 decibels

D. 120 decibels

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4

The cellular and molecular control o( programmed cell death is known as

A. Apoptosis

B. Ageing

C. Degeneration

D. Necrosis

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4

The artificial kidney operates on the principle of

A. dialysis

B. diffusion

C. osmosis

D. active transport

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4

Charles Darwin was influenced in his work by

A. Wallace

B. Lamarck

C. Malthus

D. Mendel

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4

The suggestion that the chromosomes are the carriers of hereditary material was first made by

A. Johanson

B. Flemming

C. Sutton and Boveri

D. Morgan

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4

The plant hormone which promotes ripening of fruits is

A. auxin

B. ethylene

C. gibberellin

D. cytokinin

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4

Oxygen transport is a function of

A. White Blood Corpuscles

B. Red Blood-Corpuscles

C. Blood Platelets

D. Plasma

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4

The best and easy method of control of crop pests is by

A. crop rotation

B. chemicals

C. quarantine

D. biological control

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4

Vitamin D is manufactured in a healthy human being by the action of _______ on the skin and absorbed in the blood stream.

A. ozone

B. radium

C. moonlight

D. sunlight

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4

Organisms that live in the deep sea are mainly

A. Herbivores

B. Carnivores

C. Detritivores

D. None of the above

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What do you mean by lentic biota?

A. Plants and animals in lakes and ponds

B. Plants and animals in forest

C. Plants and animals in sea water

D. Desert plants and animals