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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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The wall of the heart is made of programmed cell death is known as

A. voluntary muscles

B. involuntary muscles

C. cardiac muscles

D. skeletal muscles

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HIV causes

A. cancer

B. hepatitis

C. AIDS

D. Herpes

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Deciduous forests are those with trees

A. that are evergreen

B. that shed leaves periodically

C. that have needle like leaves

D. that have no leaves at all

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Organisms that feed on the excreta of other organisms are called

A. autotrophs

B. heterotrophs

C. coprophagous

D. saprotrophs

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Viruses have

A. DNA only

B. RNA only

C. Either DNA or RNA

D. Both DNA and RNA

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Which of these is most consistently observed in Vitamin B12 deficiency?

A. Pigmentation of skin

B. Red, sore tongue with capillary atrophy

C. Megaloblastic anemia

D. Absence of tendon reflexes

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4

The bird that lays the largest egg is

A. crow

B. ostrich

C. cuckoo

D. eagle

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Blood plasma from which fibrinogen is removed is known as

A. serum

B. blood concentrate

C. lymph

D. antibody component

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Scurvy is a disease caused by the deficiency of vitamin.

A. A

B. B

C. C

D. D

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The principal reason why it is better to have two eyes than one is that

A. by having two eyes, one can distinguish colours more easily

B. by having two eyes, one can easily see in the dark and dim light

C. this gives the man a type of vision known as mosaic vision

D. this enhances depth perception in the humans

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Temperature treatment which shortens the vegetative period and hastens the flowering is called

A. Phototropism

B. Photoperiodism

C. Vernalisation

D. Thermoregulation

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4

Compared to the veins, the walls of arteries are

A. thicker

B. thinner

C. similar

D. very much thinner

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Which of the following diseases is caused by the deficiency of iron in human body?

A. Anaemia

B. Scurvy

C. Dermatosis

D. None of these

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Diabetes is caused by

A. fall in insulin level

B. increase in insulin level

C. eating too much sugar

D. decrease in glucose

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Late Blight' is a disease that affects the _______ crop.

A. coconut

B. cashew

C. potato

D. pepper

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Polyploid wheat does not normally show an increase in

A. size

B. vigour

C. length of the life cycle

D. resistance to desease

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Fledgling is a term often used to denote the young one of a

A. bird

B. fox

C. dog

D. man

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What do you mean by the term fauna?

A. plant kingdom

B. animal kingdom

C. both plant and animal kingdoms

D. A part of plant kingdom

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Lactose and Rennin, the enzymes required to digest milk, disappear in the human body by the age of _______ years.

A. 2

B. 3

C. 5

D. 8

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Nephantis is popularly called

A. coconut caterpillar

B. brown plant hopper

C. tobacco caterpillar

D. pulse beetle

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Nephrons are found inside

A. Liver

B. Lung

C. Brain

D. Kidneys

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The theory that all animals and plants are made up of cells and they could arise only from pre-existing cells was propounded by

A. Robert Hooke

B. Matthias Schleiden and Theodore Schwann

C. Purkinije

D. Leuwenhoek

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The plant that is dispersed with the help of water is

A. mango

B. coconut

C. teak

D. paddy

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Those small organisms which float on the surface of water are called

A. Necton

B. pH indicators

C. Plankton

D. Benthos

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Digestion of proteins starts in the

A. mouth

B. stomach

C. duodenum

D. intestine

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Injection of insulin causes

A. increase in glucose in blood

B. decrease in glucose in blood

C. increase in blood pressure

D. decrease in blood pressure

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Measles is caused by

A. bacteria

B. fungus

C. virus

D. protozoan

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Which among the following vitamins is considered to be a harmone?

A. A

B. B

C. C

D. D

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Best growth of plants is attained if they are supplied with

A. low carbohydrate and high nitrogen

B. high carbohydrate and low nitrogen

C. high carbohydrate and moderate nitrogen

D. equal carbohydrate and nitrogen

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The biologist who believed in the spontaneous creation of microorganisms was

A. Leuwenhock

B. Needham

C. Spallanzeni

D. Pasteur