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4

pH of blood remains constant due to

A. blood pressure

B. buffer action

C. perspiration

D. respiration

Correct Answer :

B. buffer action


Related Questions

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4

Biologists have so far known, found and identified a large number of species in the plant and animal kingdom. In terms of numbers, the largest found and identified so far is from among the

A. fungi

B. plants

C. insects

D. bacteria

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Plants growing in saline marsh habitats are called

A. Xerophytes

B. Aerophytes

C. Saprophytes

D. Halophytes

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4

Leafy trees help in preventing

A. Land pollution

B. Water pollution

C. Noise pollution

D. Air pollution

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4

Whale reproduces by

A. ovipary

B. vivipary

C. ovovivipary

D. fission

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4

The hormone secreted when one is frightened or excited

A. pituitrin

B. thyroxine

C. adrenaline

D. parathormone

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4

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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4

The metallic part of haemoglobin is

A. copper

B. molybdenum

C. nickel

D. iron

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4

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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4

Green plants In the sea are useful for respiration of flash because they

A. release oxygen

B. release carbon dioxide

C. release oxygen and carbon dioxide simultaneously

D. take oxygen and give out carbon dioxide

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4

Waldeyer gave the name

A. microsome

B. chromosome

C. ribosome

D. lysosome

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4

Total number of amino acids in plants is

A. 10

B. 20

C. 30

D. Plenty

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4

The normal systolic blood pressure is

A. 140

B. 120

C. 180

D. 80

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4

Hormones are carried from their place of production by

A. ducts

B. blood

C. lymph

D. muscus

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4

The blood without corpuscles is called

A. bile

B. lymph

C. plasma

D. blood

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4

The cell theory of Schleiden and Schwann states that

A. cells reproduce by mitosis or meiosis

B. all cells have nuclei

C. cells are basic units of plants and animals

D. cells arise only from pre-existing cells

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4

Dr Khorana's work relates to

A. synthesis of simple DNA

B. genetic code

C. reduction of mutation

D. synthesis of RNA from bacterial cell

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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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4

Vessels proceeding to the heart are

A. veins

B. arteries

C. capillaries

D. lymph ducts

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4

The smallest size of a cell which can be seen directly by the eye is

A. One micron

B. 10 micron

C. 100 micron

D. 1000 micron

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4

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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4

What is the colour of the outer portion of the spinal cord?

A. gray

B. brown

C. white

D. yellow

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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 diseases that are caused by lack of vitamins are called

A. deficiency diseases

B. communicable diseases

C. epidemics

D. tropical diseases

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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

Which one of the following is both an exocrine and an endocrine gland?

A. Gastric glands

B. Pancreas

C. Salivary glands

D. Liver

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4

Measles is caused by

A. bacteria

B. fungus

C. virus

D. protozoan

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4

Leaves Call off branches In the winter because of

A. fall in atmospheric pressure

B. completion of the duration of life of the plant

C. formation of separation (absciss layer) just outside the cork

D. shortening of day time

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4

A few infections like sore throat, whooping cough and tuberculosis are carried through the respiratory system. Which among the following is caused by bacteria while passing through the respiratory tract?

A. diphtheria

B. dysentery

C. jaundice

D. typhoid

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4

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

A. peptidase

B. amylase

C. lipase

D. thrombokinase

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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