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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

Correct Answer :

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


Related Questions

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4

Accepted theory for the origin of life is

A. Cosmozoic theory

B. Biogenesis

C. Abiogenesis

D. Oparin's theory

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4

Haemophilia is a hereditary disease carried by

A. females and expressed by females

B. females and expressed by males

C. males and expressed by females

D. males and expressed by males

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4

Sadabahar, a common weed, is the raw material that provides the source of medicines used In the treatment of

A. gout

B. blood cancer

C. coronary heart disease

D. polio

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4

Late blight of potato is caused by

A. Puccinia

B. Pennisetum

C. Phytophthora

D. Erysiphe

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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

Dwarf plants can be made to attain their normal stature by applying

A. IAA

B. Ethylene

C. Gibberelins

D. Cytokinins

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4

The biologist who believed in the spontaneous creation of microorganisms was

A. Leuwenhock

B. Needham

C. Spallanzeni

D. Pasteur

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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

Agroecology relates

A. crops and productivity

B. crops and environment

C. crop productivity and physiology

D. crop resistance to climatic changes

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4

Most of the enzymes are

A. proteins

B. lipids

C. acids

D. alkalis

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4

Human blood is oxygenated and purified in the

A. heart

B. lungs

C. liver

D. kidneys

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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

Genes are arranged in chromosomes

A. In clusters

B. In binary fashion

C. In linear fashion

D. Scattered

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4

Cancer cells are more easily damaged by radiation than normal cells because they are

A. different in structure

B. non-dividing

C. starved of nutrition

D. undergoing rapid division

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4

What is 'atavism'?

A. The genes which show numerous phenolypic effects

B. Reappearance of traits after several generations

C. Effects of mutation

D. Intermediate inheritance of genes

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4

The deficiency of Vitamin A which leads to poor vision during night is termed

A. nyctolopia

B. myopia

C. glaucoma

D. colour blindness

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4

Organisms which synthesise their own food are called

A. autotrophs

B. heterotrophs

C. saprotrophs

D. auxotrophs

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4

Which of the following is a disease of brain?

A. SARS

B. AlDS

C. Diabetes

D. Alzheimer's

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4

The geotropism of the roots that makes them grow towards gravity is said to be

A. positive

B. negative

C. neutral

D. oblique

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4

The grouping o( blood is based on substances called

A. antibodies

B. antigens

C. antitoxin

D. enzymes

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4

The mode of nutrition in which particulate food is devoured is

A. holozoic

B. holophytic

C. saprophytic

D. parasitic

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4

Carbohydrates are mainly needed for

A. growth

B. immunity

C. repair

D. energy

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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

Sex linked genes are carried by

A. X-chromosomes

B. Y-chromosomes

C. different part of X- and Y-chromosomes

D. autosomes

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4

Bordetella pertussis causes

A. tetanus

B. diphtheria

C. whooping cough

D. rabies

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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

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

Which organelle in the cell, other than nucleus, contains DNA?

A. Centriole

B. Golgi apparatus

C. Lysosome

D. Mitochondrion

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4

When does the heart start functioning?

A. At birth

B. After birth

C. Before birth

D. After a week from birth

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4

Life begets life' or biogenesis was stated by

A. Robert Koch

B. Miller

C. Louis Pasteur

D. Lord Lister