Question # 1

When we work hard we suffer from muscle fatigue because muscle cells:

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Carry out aerobic respiration at faster rate and so are tired

Carry out anaerobic respiration and so-accumulate more CO₂

Carry out anaerobic respiration and so accumulate lactic acid

Carry out aerobic respiration at faster rate and so burst

The part of mustard plant which yields oil is

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Leaf

Seed

Root

Flower

Cells are of .............. types.

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1

2

3

4

Prior to cell replicates or duplicates its genetic material , the products are connected by a centromere and are called:

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Sister chromosomes

Homologous chromosomes

Non-sister chromatids

Sister chromatids

................... is the hereditary material.

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Protien

Chromosomes

DNA

Nucleus

We made every living thing from.

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Water

Soil

Air

Fire

............... are present only in plant cells.

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Plastids

Nucleus

Nucleolus

Ribsomes

Which one of the following convert protein to amino acids?

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Protease

Lipase

Both

None

The size of a virus is _____________

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40-50 nm

20-40 nm

10-40 nm

30-50 nm

Lock and key model was proposed by ................. .

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Emil Fisher

Koshland

Freitz London

None

Experimentation is only a step of the scientific process but it is very important step because it always:

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Gives the biologist a correct result

Allows rejection of some alternative hypothesis

Ensures that hypothesis can be confirmed with certainity

Give scientists a chance to work in the laboratory

The body of which organism consists only of RNA?

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Prions

Viroids

Viruses

Algae

Humans belong to a species called ____________

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Homo

Sapiens

Both and b

None of these

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