Solved MCQs of Biology Class 9 Chapter 9

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Solved MCQs of Biology Class 9
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When do the atria contract?
Before diastole
After systole
During diastole
During systole

In most plants the food is transported in the form of:
Glucose
Sucrose
Starch
Proteins

In most plants, the food is transported in the form of:
Glucose
Sucrose
Starch
Proteins

A patient with blood group A can be given the blood of donor who has;
Blood group A or AB
Blood group A or O
Blood group A only
Blood group O only

According to pressure flow mechanism which is the actual force behind the movement of food in phloem?
Drop in the pressure at the sink end
Gain of water at the sink end
Osmotic pressure
All of these

Which of the following tissue layer is found in all blood vessels?
Smooth muscle
Endothelium
Skeletal muscle
Connective tissue

What happens when a mismatched blood group is injected in recipient?
(‘radio-button-click-target’, “Antibodies of the recipient’s blood destroy donor’s RBCs”)(‘radio-button-click-target’, “Antibodies of the donor’s blood breakdown recipient’s RBCs”)
Both of these can happen
None of these and such transfusion can be safe

A cubic millimeter of blood contain about …………. million RBCs.
5
10
15
20

PH of human blood is ……………………. .
7.1
7.2
7.3
7.4

Plants form beneficial relationships with soil bacteria fungi in order to:
Avoid diseases
Absorption of minerals
Transpire more water
All of these

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