Question # 1

Stomata close when guard cells:

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Loss water

Gain chloride ions

Become turgid

Grain potassium ions

The death of the heart tissue is called:

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Arterioclerosis

Atherosclerosis

Myocardial infarction

Thalassemia

Which of the followings in not true about the opening and Closing of Stomata?

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Light helps in the opening and closing of stomata

K⁺ ions are responsible for the opening and closing of stomata

The osmosis of water is responsible for the opening and closing of stomata

None for these

Which ions are involved in opening and closing of stomata?

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Potassium ions

Chloride ions

Sodium ions

Iodide ions

Which of the following blood vessels have oxygenated blood?

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Pulmonary artery

Pulmonary vein

Superior vena cave

Inferior vena cave

Heart consists of ............ chambers.

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Two

Three

Four

Five

Blood is composed of ................. parts.

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One

Two

Three

fOUR

A cubic millimeter of blood contain about ............. million RBCs.

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5

10

15

20

Exchange of materials between blood and surrounding tissues occurs in:

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Arteries

Veins

Capillaries

All of these

Which of the following is a function of human blood?

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It regulates body temperature

It transports wastes

It provides defence

All of the above

Normal rate of heart beat in a healthy human being is ......... beats per minute.

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72

73

70

75

What is correct about human red blood cells?

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Have limited life span

Are capable of phagocytosis

Produce antibodies

Are multinucleate

Plasma is made up of water and _____________

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Metabolities and wastes

Salts and ions

Proteins

All of the above

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