Question # 1

Important cause of species extinctions is:

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Habitat loss

Deforestaion

Over population

Both a and b

Which of the following variable is least likely to affect an enzymes rate of reaction?

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Temperature

pH

Carbon dioxide concentration

Enzyme concentration

Lignin is present in:

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Primary wall

Secondary wall

None of above

............... is an essential requirement of photosynthesis.

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CO2

H2O

O2

All

Beriberi can be produced by the lack of ......... .

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Vitamin A

Vitamin B

Vitamin BI

Vitamin C

Which of these statements is correct about the circulatory system?

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It transports hormones

Capillaries have thicker walls than veins

Systemic circulation carries blood to and from the lunges

All of the above are true

The large omnivorous bird that flies to Pakistan in winter from former Sovier territory is:

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Chakor

Houbara Bustard

Kiwi

Ostrich

Cells of which of the followings are called cancerois cells?

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Malignant tumer

Benign tumer

Both a and b

None of the above

Which of the following is unique to mitosis and not a part of meiosis?

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Homologous chromosomes pair forming bivalents

Homologous chromosomes cross over

Chromosomes pairs are broken during anaphase

Chromatids separate during anaphase

When an enzyme is no longer able to work, it is said to be:

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Catalyzed

Dead

Cofactored

Denatured

................. is called power house of cell.

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Mitochondria

Cell wall

Nucleus

Vaculoe

Ribosomes are present in :

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SER

RER

Both

NOne

Plasma contains .................. % water.

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10%

7%

90%

2%

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