Life Processes Test

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Life Processes Test - 48

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Question 1
1 / -0

Pulmonary veins pour ______ blood into the left atrium.

A
Oxygenated

B
Deoxygenated

C
Both A or B

D
Mixed

Solution

The pulmonary veins are blood vessels that carry oxygenated blood from the lungs and drain into the left atrium of the heart. There is a total of four pulmonary veins; two from each lung. Pulmonary veins are the only veins in the body that carry oxygenated blood. So, the correct answer is option A.
Question 2
1 / -0

The process of transpiration in plants helps in:

A
Opening of stomata.

B
Absorption of $$CO_2$$ from atmosphere.

C
Upward conduction of water and minerals.

D
Absorption of $$O_2$$ from atmosphere.
Solution
The evaporation of excess water from the stomata present on the leaf surface is called transpiration.
It is important for the upward movement of water in plants and in regulating the temperature of plants.
It creates a suction pressure that pulls up water from the xylem of the roots to the stem and then to the leaves.
So, the correct answer is option C.
Question 3
1 / -0

In the cardiac cycle, diastole is

A
The number of heart beats per minute.

B
The relaxation period after contraction of the heart.

C
The forceful pumping action of the heart.

D
The contraction period after relaxation of the heart.
Solution
Correct Option: B
Explanation:
- The cardiac cycle has two phases of the heart beat-systole and diastole.
Systole is the phase in which the heart chamber contracts after refilling with blood. It is the period of contraction.
Diastole is the phase of the cycle when heart chambers relax and are filled with blood. It is the period of relaxation.
Hence, diastole is the relaxation period after the contraction of the heart.
Question 4
1 / -0

Which of the following is not a function of circulatory system?

A
Homeostasis

B
Transport of gases

C
Urea formation

D
Temperature regulation
Solution
- The circulatory system has several functions such as:
1. The transportation of substances
2. The removal of metabolic wastes.
3. Maintaining the body temperature
4. Protecting the body from certain diseases.
5. Regulation of the body activities by transporting hormones.
- The formation of urea is the function of excretory system.
Thus, the correct answer is option C.
Question 5
1 / -0

Due to its nature of ..............., the blood is a connective tissue.

A
Rigidity

B
Fluidity

C
Flexibility

D
Acidity

Solution

Blood is considered a connective tissue because of its fluidity. The living cell types are red blood cells; called as erythrocytes, white blood cell; called as leukocytes and platelets called thrombocytes. The fluid portion of whole blood, its matrix, is commonly called as plasma.
Hence the correct option is B.
Question 6
1 / -0

The function of the glomerulus and Bowman's capsule of the nephron is to

A
Reabsorb water into the blood.

B
Eliminate ammonia from the body.

C
Reabsorb salts and amino acids.

D
Filter the blood and form the filtrate.
Solution
- The glomerulus is the blood capillary present in the bowman's capsule, where blood is filtered due to the pressure difference between afferent and efferent arteriole caused due to differences in their diameters.
- The blood that comes into the bowman's capsule of the nephron is filtered i.e., without any blood corpuscles.
Thus, the correct answer is (D).
Question 7
1 / -0

Blood vessel carrying blood from lung to heart is

A
Pulmonary artery

B
Pulmonary vein

C
Coronory artery

D
None of the above

Solution

Pulmonary vein carries oxygenated blood from the lungs into the left auricle. This is an exception as veins generally carry deoxygenated blood.
So, the correct answer is option B.
Question 8
1 / -0

Exchange of wastes, nutrients, gases, and hormones between the blood and the body cells occurs in the ____________.

A
Arteries

B
Arterioles

C
Capillaries

D
Veins

Solution

Capillaries are the smallest blood vessels that branch out from arterioles to form networks around body cells.
The wall of capillaries is single cell thick. The exchange of materials like wastes, nutrients, gases, and hormones between the blood and the surrounding cells take place across this thin wall.
So, the correct answer is option C.
Question 9
1 / -0

Veins can be differentiated from arteries, as the veins have:

A
Valves

B
Thicker walls

C
Oxygenated blood

D
Red blood cells

Solution

Veins carry deoxygenated blood (except pulmonary vein) from all parts of the body to the heart. To prevent the backflow of this blood, veins have valves.
Arteries carry oxygenated blood. The blood flows at very high pressure in the arteries. That is why they have thicker walls.
Both arteries and veins carry blood that has red blood cells in it.
So, the correct answer is option A.
Question 10
1 / -0

Excretion means:

A
Removal of harmful metabolic wastes from the body.

B
Formation of the metabolic substances which plays some role in the body.

C
Breakdown of large insoluble food molecules into small water-soluble food molecules.

D
Formation of new offspring by an individual organism.
Solution
Correct Option: A
Explanation:
- Excretion is an essential process in all forms of life. It is a process in which metabolic waste is eliminated from the body of an organism. Accumulation of these wastes beyond a level inside the body is harmful to the body of an organism.
- In mammals, urine is expelled with the help of the excretory system. In unicellular organisms, waste products are discharged directly through the surface of the cell.
- In green plants, excretory gases like carbon dioxide and oxygen exit the plant body through stomata, root cell walls, etc. They also eliminate waste materials in the form of resin, saps, latex, etc.
Hence, excretion is the removal of harmful metabolic wastes from the body.

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Life Processes Test - 48

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Life Processes Test - 48

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SHARING IS CARING

Question 1

Oxygenated

Deoxygenated

Both A or B

Mixed

Solution

Question 2

Opening of stomata.

Absorption of $$CO_2$$ from atmosphere.

Upward conduction of water and minerals.

Absorption of $$O_2$$ from atmosphere.

Solution

Question 3

The number of heart beats per minute.

The relaxation period after contraction of the heart.

The forceful pumping action of the heart.

The contraction period after relaxation of the heart.

Solution

Question 4

Homeostasis

Transport of gases

Urea formation

Temperature regulation

Solution

Question 5

Rigidity

Fluidity

Flexibility

Acidity

Solution

Question 6

Reabsorb water into the blood.

Eliminate ammonia from the body.

Reabsorb salts and amino acids.

Filter the blood and form the filtrate.

Solution

Question 7

Pulmonary artery

Pulmonary vein

Coronory artery

None of the above

Solution

Question 8

Arteries

Arterioles

Capillaries

Veins

Solution

Question 9

Valves

Thicker walls

Oxygenated blood

Red blood cells

Solution

Question 10

Removal of harmful metabolic wastes from the body.

Formation of the metabolic substances which plays some role in the body.

Breakdown of large insoluble food molecules into small water-soluble food molecules.

Formation of new offspring by an individual organism.

Solution

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