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4

Fusarium causes the wilting of the cotton plants by

A. clogging the vessels

B. producing toxic substance

C. causing necrosis of roots

D. killing the leaves

Correct Answer :

B. producing toxic substance


Related Questions

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4

Kwashiorkar is a deficiency disease

A. due to poor intake of proteins

B. due to poor intake of carbohydrates

C. due to (a) and (b)

D. due to poor intake of lipids

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4

One of the following is often called the master gland. Which one is it?

A. Thymus

B. Islets of Langerhans

C. Pituitary

D. Thyroid

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4

One of the following disease cannot be prevented by the DPT (triple-antigen) immunization of children.

A. Tetanus

B. Tuberculosis

C. Whooping cough

D. Diphtheria

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4

The artificial kidney is a

A. machine

B. transplant

C. another's kidney

D. other kidney form same body

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4

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

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4

Scrub jungle Is characterised by

A. heavy rainfall

B. no rainfall

C. poor rainfall

D. none of the above

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4

The insects do not have blood pigments because

A. there is no blood

B. blood does not have a respiratory function

C. tissues have pigments

D. pigments are elsewhere

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4

The science dealing with diseases of plants is called

A. Plant anatomy

B. Plant ecology

C. Plant pathology

D. Plant morphology

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4

Which of the following plays an important part in photosynthesis?

A. Chloroplast

B. Centrosome

C. Tonoplast

D. Nematoblast

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4

The primary energy for living organisms is

A. Solar energy

B. Chemical energy

C. Mitochondria

D. ATP

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4

Coagulation of blood in vessels is prevented during normal circulation by

A. heparin

B. prothrombin

C. plasmogen

D. thromboplastin

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4

Rate of mutation can be increased in plants by

A. More manure

B. More pesticides

C. X-ray

D. More light

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4

The mouth of a river opening into the sea is termed as

A. shore line

B. littoral zone

C. continental shelf

D. estuary

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4

Hormones are carried from their place of production by

A. Ducts

B. Blood

C. Lymph

D. Mucus

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4

Edward Jenner to find out the efficacy of vaccination used

A. his own body

B. his friend's body

C. a corpse

D. a laboratory animal

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4

Veins carry blood

A. towards the heart

B. away from the heart

C. both to and from the heart

D. only around the heart

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4

The 'germ theory of disease' was propounded by

A. Joseph Lister

B. Robert Koch

C. Louis Pasteur

D. Jacob Heule

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4

The two minerals required to keep teeth and bones intact and in good condition are

A. lead and zinc

B. calcium and phosphorus

C. copper and sulphur

D. iron and iodine

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4

Blood cancer is otherwise called

A. Leukaemia

B. Leucoderma

C. Leucocytopenia

D. Erythrocemia

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4

Blood of cockroach is

A. red

B. bluish

C. greenish

D. colourless

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Which one of the following is essential for blood clotting?

A. RBC

B. WBC

C. Blood platelets

D. Lymph

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4

One of the sequences given below represents a complete metamorphosis. Which one is it?

A. Egg - adult

B. Egg - nymph - adult

C. Egg - larva - pupa - adult

D. young one adult

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4

In plants water is carried upwards by

A. phloem

B. paranchyma

C. xylem

D. meristem

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4

The potato is a modified stem, is explained by the presence of

A. Branches

B. Leaves

C. Buds

D. Scale leaves and auxiliary buds

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4

The biogenetic law was proposed by

A. Alfred Russel Wallace

B. Charles Darwin

C. Ernst von Haeckel

D. Lamarck

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4

Nekton are those organisms

A. which cannot be netted

B. which are independent of tides and waves

C. which have long necks

D. None of the above

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4

Development without fertilization is called

A. parthenogenesis

B. asexual reproduction

C. sporulation

D. budding

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4

The gestation period for the elephant is

A. 10 months

B. 15 months

C. 22 months

D. 30 months

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4

The rate of heartbeat is accelerated by the hormone

A. adrenaline

B. acetylcholine

C. thyroxine

D. pituitrin

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4

Consumption of potassium cyanide leads to total stoppage of cellular activity in the human body, as it cripples the

A. heart

B. lungs

C. kidneys

D. mitochondria