Question # 1

In neurons the message is transmitted across synapse in the form of chemical messenger called.

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Nerve impulse

Synaptic vesicle

Neurotransmitters

Communlaction

Some individuals leave behind more progeny than others and teh rate at which they do so is affected by their inherited characteristics. This is called.

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Non random mating

Selection

Migration

Mutation

The group of animals whose excretory system is structurally associated with nutritive tract.

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Vertebrates

Earthworm

Insects

Planaria

Awoman with normal colour vision, whose father was red-green colour blind, married a red-green colour-blind man. What is the probality of her first-born child being red-green colour blind?

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1.0

0.75

0.50

0.025

Hyponastic movements occur in response to.

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Contact

Chemical

Temperature

Water

Which of the following chromosome abnormalities lead to tallness, aggressiveness mental defect and anti social behavior.

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XXY

XXXY

XO

XYY

Interphase can further be divided into

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G₁-phase,S-phase and G₂-phase

G₁-phase,G₂-phase and G₃-phase

S₁-phase,S₂-phase and S₃-phase

S₁-phase,G-phase and S₂-phase

Uric acid is produced from metabolism of.

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Nucleic acid

Fetty acid

Carbohydrates

Lipds

Most of the major orangs of embryo are formed within the.

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10 week

12 week

14 week

15 week

Downs syndrome (Mongolism) occurs in man during which 21^st chromosome falls to segregate resulting gamete with

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20 chromosomes

21 chromosomes

22 chromosomes

24 chromosomes

Human skin colour is controlled by gene pairs.

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Two to four

Three to six

Four to six

Six to ten

During elongation the cell volume increase up to 150 fold due to uptake of

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Light

Oxygen

Water

Carbon dioxide

If population of predator increase then population of prey

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Increases

Decreases

May increase

Has no effect or decrease

Bats and humming birds are called.

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Ectotherms

endotherms

Heterotherms

Mesotherms

Eco. R is a commonly used

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Gene

Restriction enzyme

Bacteria

Bacteriophage

The whole of the world land is called.

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Lithosphere

Hydrosphere

Ecosphere

Biosphere

Why is there no glucose present in the filterate in the distal tubule of a nephron?

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Its molecules are two large to pass across the base ment membrane

It is removed by osmosis from the tubule

It is positively absorp by the cells lining the descending loop of henie

He is actively absorb by hte proximal tubule cells

The animal that is caught and eaten is called.

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Predator

Host

Prey

Parasite

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