Practice Pakistan's most useful MCQs for competitive exams

The increase in pH of blood has ________ effect on the oxygen carrying capacity of haemogolobin?

• (A)  plus ve
• (B)  – ve
• (C)  No
• (D)  All of these

Answer

Submitted By :Ali Uppal

The glycolate produced diffuses into the membrane bounded organelles called____________?

• (A)  Glyoxisomes
• (B)  Peroxisomes
• (C)  Lysosomes
• (D)  Mitochondria

Answer

Submitted By :Ali Uppal

The air spaces may comprise upto _________ of total volume of leaf surface?

• (A)  30%
• (B)  20%
• (C)  40%
• (D)  50%

Answer

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There are _________ stomata per square cm of leaf surface in Tobacco plants?

• (A)  1200
• (B)  12000
• (C)  100,000
• (D)  1000

Answer

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Important factors which affect the capacity of haemoglobin to combine with oxygen is

• (A)  Temperature
• (B)  Carbon dioxide
• (C)  pH
• (D)  All of these

Answer

Submitted By :Ali Uppal

Water is _________ times viscous than air?

• (A)  50
• (B)  1000
• (C)  5000
• (D)  8000

Answer

Submitted By :Ali Uppal

Haemoglobin can be almost completely oxygenated by an oxygen pressure of __________ of mercury.

• (A)  10 mm
• (B)  60 mm
• (C)  10 cm
• (D)  100 mm

Answer

Submitted By :Ali Uppal

Oxygen contents per liter of air is____________?

• (A)  10 ml
• (B)  100 ml
• (C)  200 ml
• (D)  100ml

Answer

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The maximum amount of oxygen which normal human blood absorbs and carries at sea level is ________ per 100 ml of blood.

• (A)  10 ml
• (B)  20 ml
• (C)  30 ml
• (D)  40 ml

Answer

Submitted By :Ali Uppal

Which of the following animals has a respiratory system with one way flow of the air through the lungs, and the air is renewed after inspiration?

• (A)  Cockroach
• (B)  Earthworm
• (C)  Aves
• (D)  Frogs

Answer

Submitted By :Ali Uppal