Life Processes Test

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Life Processes Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

The figure that correctly depicts the removal of chlorophyll is :

A
(I)

B
(II)

C
(III)

D
(IV)
Question 2
1 / -0

The diagram shows a section through the human heart. Which blood vessels carry blood to and from the lungs?

A
Blood to lungs - 1, Blood from lungs - 3

B
Blood to lungs - 1, Blood from lungs - 4

C
Blood to lungs - 2, Blood from lungs - 3

D
Blood to lungs - 2, Blood from lungs - 4
Solution
- The labeled portion depicted by the number 2 is the pulmonary artery that carries deoxygenated blood to the lungs from the right ventricle of the heart.
- The labeled portion depicted by the number 4 is the pulmonary vein that returns oxygenated blood to the left atrium of the heart.
Thus the correct answer is option D.
Question 3
1 / -0

Small intestine in herbivores is longer than in carnivores because

A
Digestion of cellulose takes a longer time

B
Digestive juices of herbivores are not so functional

C
Most of the herbivores swallow food

D
None of the above

Solution

Cellulose is a polysaccharide which has strong glycosidic bonds. Its digestion takes a longer time. Hence, herbivores who eat grass/green leafy vegetables need a longer small intestine to allow complete digestion of cellulose. Carnivores animals cannot digest cellulose, hence, they have a shorter intestine.
Thus, the correct answer is option A.
Question 4
1 / -0

Human blood pressure (B.P.) is represented by what is called a pressure picture. In a normal human being, the pressure picture is 120/80/40 where 120 represents systolic pressure, 80 represents diastolic pressure, and 40 represents the pulse pressure which is the resultant difference in the two pressures. In one of the patients, the pressure picture was found to be 140/110/30 suggesting that there has been

A
an increase in the resistance from arteries

B
a decrease in the resistance from arteries

C
an increase in the resistance from veins

D
a decrease in the resistance from veins
Question 5
1 / -0

Which one of the following is correct?

A
Left atrium and left ventricle - oxygenated blood, right atrium and right ventricle - deoxygenated blood

B
Left atrium and left ventricle - deoxygenated blood, right atrium and right ventricle - oxygenated blood

C
Both A and B

D
None of the above

Solution

There are four chambers in the human heart:
(i) Left atrium, (ii) Left ventricle, (iii) Right atrium and (iv) Right ventricle.
(i) Left atrium- It takes the oxygenated blood from the lungs via a pulmonary vein ( the only vein carrying the oxygenated blood in the human body) and pass the blood to the left ventricle during systole.
(ii) Left ventricle- It takes the oxygenated blood from the left atrium and supplies the oxygenated blood all over the body via aorta during systole.
(iii) Right atrium- It takes the deoxygenated blood from all over the body via superior and inferior vena cava during diastole and passes the blood to the right ventricle during systole.
(iv) Right ventricle- It takes the deoxygenated blood from the right atrium and pass the blood for purification (oxygenation) to the lungs via pulmonary artery during systole.
Therefore, the correct answer is option A.
Question 6
1 / -0

What will happen if mucus is not secreted by the gastric glands?

A
Erosion of stomach wall

B
Erosion of intestinal wall

C
Indigestion of food

D
Enlargement of stomach

Solution

Gastric mucus is a gel-mucous barrier secreted by epithelial cells and glandular cells in the stomach wall. It acts as part of a barrier that protects the stomach wall from the acid and digestive enzymes within the stomach lumen.
So, if mucus is not secreted by the gastric glands, erosion of stomach wall occurs.
Option 'A' is correct.
Question 7
1 / -0

Which of the following statements is correct with respect to a four-chambered heart?

A
The left half is completely separated from the right half by a septum.

B
Complete partitioning prevents mixing of oxygenated and deoxygenated blood.

C
It allows a highly efficient supply of oxygenated blood to all parts of the body.

D
All of the above

Solution

In a four-chambered heart, the left half is completely separated from the right half by the septum. This prevents the mixing of oxygenated and deoxygenated blood. This allows a highly efficient supply of oxygenated blood to all parts of the body. This is useful in animals that have high energy needs, such as birds and mammals.
Therefore, the correct answer is option D.
Question 8
1 / -0

Which one of the following is the correct combination of the relevant materials required for setting up an experiment to show that light is necessary for photosynthesis.

A
Destarched leaves, strips of black paper, starch solution and iodine crystal

B
A potted plant, strips of coloured paper, starch solution, iodine and potassium iodide.

C
Destarched potted plant, strips of black paper, starch solution, potassium iodide.

D
Destarched potted plant, strips of black paper and iodine solution.
Solution
Experiment to show that light is necessary for photosynthesis require the following relevant materials-
Destarched potted plant, so that no part of the plant contain starch.
Strips of black paper, as it can't absorb light.
And Iodine solution, to perform the starch test.
Option "D" is correct.
Question 9
1 / -0

To determine that light is essential for photosynthesis, following are the steps, but not in
sequence :
(i) Pluck the leaf and do the starch test.
(ii) Keep the selected plant in sunlight.
(iii) Destarch the plant for 48 - 72 hours.
(iv) Cover the leaf with black paper strip.
The correct sequence is

A
(iii), (i), (ii), (iv)

B
(iii), (ii), (iv), (i)

C
(iii), (iv), (ii), (i)

D
(i), (ii), (iv), (iii)
Solution
The correct sequence determining that light is essential for photosynthesis is-
Destarch the plant for 48-72 hours.
Cover the leaf with black paper strip.
Keep the selected plant in sunlight.
Pluck the leaf and do the starch test.
Option "C" is correct.
Question 10
1 / -0

In an experiment to test the presence of starch in a leaf, the leaf is boiled in alcohol for a few minutes using a water bath. This is an essential step in the experiment because:

A
Alcohol is highly volatile.

B
Alcohol decolourises the leaf.

C
Alcohol cleans the leaf.

D
Alcohol gives nutrients to the leaf.

Solution

The presence of starch in the leaves proves the process of photosynthesis in the plants. Now, in order to check the presence of starch, iodine solution is used. In the presence of starch, iodine changes its colour from yellow to blue-black colour. This change in colour cannot be seen in green leaves. Hence, to remove the green pigment present in the leaf, the leaf is boiled in alcohol using a water bath. The green pigments get dissolved in the alcohol and the leaf gets decolourised. The colour change of iodine is properly visible in the decolourised leaf.

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Life Processes Test - 47

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Life Processes Test - 47

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SHARING IS CARING

Question 1

(I)

(II)

(III)

(IV)

Question 2

Blood to lungs - 1, Blood from lungs - 3

Blood to lungs - 1, Blood from lungs - 4

Blood to lungs - 2, Blood from lungs - 3

Blood to lungs - 2, Blood from lungs - 4

Solution

Question 3

Digestion of cellulose takes a longer time

Digestive juices of herbivores are not so functional

Most of the herbivores swallow food

None of the above

Solution

Question 4

an increase in the resistance from arteries

a decrease in the resistance from arteries

an increase in the resistance from veins

a decrease in the resistance from veins

Question 5

Left atrium and left ventricle - oxygenated blood, right atrium and right ventricle - deoxygenated blood

Left atrium and left ventricle - deoxygenated blood, right atrium and right ventricle - oxygenated blood

Both A and B

None of the above

Solution

Question 6

Erosion of stomach wall

Erosion of intestinal wall

Indigestion of food

Enlargement of stomach

Solution

Question 7

The left half is completely separated from the right half by a septum.

Complete partitioning prevents mixing of oxygenated and deoxygenated blood.

It allows a highly efficient supply of oxygenated blood to all parts of the body.

All of the above

Solution

Question 8

Destarched leaves, strips of black paper, starch solution and iodine crystal

A potted plant, strips of coloured paper, starch solution, iodine and potassium iodide.

Destarched potted plant, strips of black paper, starch solution, potassium iodide.

Destarched potted plant, strips of black paper and iodine solution.

Solution

Question 9

(iii), (i), (ii), (iv)

(iii), (ii), (iv), (i)

(iii), (iv), (ii), (i)

(i), (ii), (iv), (iii)

Solution

Question 10

Alcohol is highly volatile.

Alcohol decolourises the leaf.

Alcohol cleans the leaf.

Alcohol gives nutrients to the leaf.

Solution

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