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Lecuminous plants are recommended for rotation of crops because they

A. kill harmful insects

B. require little amount of water

C. help in Nitrogen fixation

D. are cash crops

Correct Answer :

C. help in Nitrogen fixation


Related Questions

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The bird that lays the largest egg is

A. crow

B. ostrich

C. cuckoo

D. eagle

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Formation of blood

A. Histolysis

B. Histogenesis

C. Haemopoiesis

D. Haemolysis

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Maintenance of pregnancy is under the control of

A. follicular stimulating hormone

B. growth hormone

C. estrogen

D. progesterone

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Egg laying animals are referred to as

A. viviparous

B. oviparous

C. ovoviviparous

D. vegetative

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Who was the first scientist to use an instrument for biological studies in 1665?

A. Robert Hooke

B. Schwann

C. Schleiden

D. None of the above

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The plant hormone which promotes ripening of fruits is

A. auxin

B. ethylene

C. gibberellin

D. cytokinin

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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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The radicle of the seeding always grows

A. towards the gravity

B. away from gravity

C. neutral to gravity

D. towards light

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In phototropism, auxins

A. Promote growth of cells

B. Inhibit cell division

C. Inhibit growth of cells

D. Stimulate differential growth of cells

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Aphids are

A. insect pests

B. fungal pests

C. bacterial pests

D. viral pests

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The olfactory area is concerned with

A. smell

B. sight

C. hearing

D. speech

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It is possible to produce seedless tomato fruits by

A. applying trace elements in tomato fields

B. spraying mineral solution on plants

C. spraying harmones on flowers

D. applying fertilizers containing radioactive elements

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What are top carnivores?

A. biggest carnivores

B. tigers

C. all carnivorous animals

D. carnivores that are not eaten by any other animal

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Charles Darwin was influenced in his work by

A. Wallace

B. Lamarck

C. Malthus

D. Mendel

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Insect pollination is known as

A. Hydrophily

B. Ornithophily

C. Anemophily

D. Entomophily

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Blood is

A. acidic

B. alkaline

C. neutral

D. like a buffer

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Spontaneous generation signifying the development of living organisms from non-living has been termed

A. Biogenesis

B. Abiogenesis

C. Cosmozoic

D. Catastrophism

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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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Vestigeal organs are those which are

A. fully formed and functional

B. much reduced but functional

C. much reduced and functionless

D. fully formed but functionless

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Development without fertilization is called

A. parthenogenesis

B. asexual reproduction

C. sporulation

D. budding

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What are oncogenes?

A. a dominant gene

B. a set of genes which produce cancer

C. a gene present in the X-chromosomes causing haemophilia

D. a recessive gene

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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 first person to observe the bacteria, protozoa and spermatozoa under the microscope was

A. Theodore Schwann

B. Matthias Schleidon

C. Robert Hooke

D. Leuwenhoek

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The scientist who discovered the blood groups is

A. Landsteiner

B. TH Morgan

C. William Harvey

D. Darwin

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During dehydration, the human body is usually lost by the human body is

A. sugar

B. sodium chloride

C. potassium chloride

D. iodine

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Bird nu is a disease which affects and spreads through

A. Cattle

B. Sheep

C. Prawn

D. Poultry

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The blood without corpuscles is called

A. bile

B. lymph

C. plasma

D. blood

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The 'germ theory of disease' was propounded by

A. Joseph Lister

B. Robert Koch

C. Louis Pasteur

D. Jacob Heule

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Darwinism does not explain

A. progression

B. retrogression

C. usefulness of all organs

D. presence of vestigial organs

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Organisms that live in the deep sea are mainly

A. Herbivores

B. Carnivores

C. Detritivores

D. None of the above