Life Processes Test

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Life Processes Test - 3

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Question 1
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Directions For Questions

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Refer to the above figure and choose the incorrect option.

A
A are photosynthetic organisms.

B
B are the consumers in the food chain.

C
A give out CO₂ in photosynthesis.

D
B reproduce both sexually and asexually.

Solution

A are plants and plants give out oxygen during the process of photosynthesis.They utilise CO₂ during photosynthesis. Plants store their food as starch.
Question 2
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Directions For Questions

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Refer to the above flow chart and choose the incorrect option.

A
A: Longest structure of the gastrointestinal tract

B
B: Breaking down of glucose with release of energy

C
C: Carried out in large intestine

D
D: Takes place through anus

Solution

C is breaking down of complex food into simpler materials i.e. digestion. It is carried out in stomach and small intestine. No digestion takes place in large intestine. Options 1, 2 and 3 are correct. Site of absorption is intestine which is the longest structure of the gastrointestinal tract. Assimilation is breaking down of food to release energy and in the process of egestion, undigested food is removed through anus.
Question 3
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Refer to the above figure and choose the correct option.

A
Area 1 is for the salty taste.

B
Area 2 is for the bitter taste.

C
Area 3 is for the sour taste.

D
Area 4 is for the sweet taste.
Solution
Area 4 is for the sweet taste. The taste buds for sweet taste are present in this part. The role of taste buds in different areas of the tongue are as follows:
- Buds in area 1: Bitter taste
- Buds in area 2: Sour taste
- Buds in area 3: Salty taste
- Buds in area 4: Sweet taste
Question 4
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The stomach in the gastrointestinal tract is

a. protected by a mucus layer
b. a fat absorption organ
c. thick-walled
d. a chyme forming organ

A
b, c and d

B
a, b and d

C
a, c, and d

D
a, b, c and d

Solution

The inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices. The mucous protects the lining of the stomach. It is a thick-walled organ and reduces food into a semi-fluid suspension called chyme.
Question 5
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A disaccharide present in the milk of mammals is known as

A
fructose

B
galactose

C
glucose

D
lactose

Solution

Disaccharide present in milk is lactose, which composed of galactose and glucose. It is also called milk sugar.
Question 6
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Given below is a sketch of a leaf partially covered with black paper. It is to be used in the experiment to show that light is necessary for the process of photosynthesis. At the end of the experiment,which one of the leaf parts labelled, I, II and III will become blue black when dipped in iodine solution?

A
I only

B
II only

C
I and III

D
II and III

Solution

Black paper does not allow light to pass through it as it absorbs all light falling on it. Hence, portions I and III will be performing photosynthesis. No photosynthesis will occur in leaf area covered by black portion.When tested for presence of starch, only portions I and III will give positive result.
Question 7
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Which blood group does not have any antigen but possesses both 'anti a' and 'anti b' antibodies?

A
A

B
O

C
B

D
AB

Solution

Blood group O does not have any antigen on its surface but possesses both 'anti a' and 'anti b' antibodies. Therefore, O negative blood group is considered the universal donor.
Question 8
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In public urinals, the urine gives a pungent smell due to

A
conversion of creatinine into ammonia

B
conversion of uric acid into ammonia by ornithine cycle

C
conversion of urea into ammonia by bacteria

D
None of the above

Solution

Public urinals, which lack water generally, give a pungent smell. This is because urea present in the urine gets broken down into ammonia and carbonate by the bacterial enzyme urease. The ammonia is responsible for the pungent smell.
Question 9
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The correct path of lymph flow is:

(a) Lymph capillaries Lymph vessels Veins
(b) Lymph capillaries Lymph vessels Arteries

A
Only a is correct.

B
Only b is correct.

C
Both a and b are correct.

D
Both a and b are incorrect.

Solution

Unlike blood, lymph flows only in one direction. The flow is from lymph capillaries to lymph vessels and then into the venous blood stream.
Question 10
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What will happen to the body of an adult human being, if his spleen is removed?

A
RBC production will be reduced.

B
Antibodies production will be less.

C
WBC production will be less.

D
Recycling of dead RBCs would not be possible.

Solution

Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen also helps fight certain kinds of bacteria that cause pneumonia and meningitis.
Question 11
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Directions: Refer to the figure and choose the incorrect option.

A
Complete oxidation of food occurs in A

B
C is associated with both alcohol and lactic acid production

C
B takes place inside the cells

D
B takes place in the presence of oxygen

Solution

B is associated with release of energy, thus B is cellular respiration. Cellular respiration takes place both in presence and absence of oxygen. When energy is released from glucose with the use of oxygen, it is called aerobic respiration. Cellular respiration can also occur without using oxygen. This is called anaerobic respiration. Breakdown of food by any kind of respiration releases energy.
Question 12
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Refer to the above flow chart and choose the correct option with reference to A, B, or C.

A
A has thin and elastic walls.

B
B permits exchange of gases.

C
C takes blood away from heart.

D
A possess mechanism to prevent backflow.

Solution

B represents extremely thin tubes. Thus, B are capillaries as capillaries are extremely thin tubes which are in close contact with body tissues. Capillaries permit exchange of gases during respiration.
In A, blood flows at high pressure. Thus, A are arteries. Arteries have thick and elastic walls.
C are vessels with valves. Thus, C are veins. Veins do not take blood away from the heart.
Question 13
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In the figure shown above, the functions and characteristics of a physiological process X (in plants) have been shown.

Which of the following sentence is true about X?

A
X takes place through hydathodes.

B
X is important for photosynthesis.

C
X is carried out by xylem.

D
X involves pores on leaves called stomata.

Solution

X cools down plant, generates suction pull and involves evaporation of water; thus, X is the process of transpiration. Transpiration is carried out through small pores on leaves called stomata.
Question 14
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Refer to the above figure and choose the correct statements:

a. Unidirectional movement is observed in A.
b. Unidirectional movement is observed in B.
c. Bidirectional movement is observed in A.
d. Bidirectional movement is observed in B.

A
a and b

B
b and c

C
a and d

D
c and d

Solution

A is involved in transportation of water; thus, A is xylem tissue. Water moves from roots to all plant parts in xylem. As roots are the only part below the ground, water moves in only one direction in xylem, i.e. upwards; thus, unidirectional movement manifests in xylem (A).
B are vascular tissues involved in the transportation of food; thus, B is phloem. Food is synthesised in leaves and has to be transported to all the plant parts both on the upper and lower sides of leaves; thus, bidirectional movement manifests in phloem (B).
Question 15
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Read the following statements and select the correct option accordingly.

Statement 1: Plants absorb water and minerals by the roots.
Statement 2: The outer wall of roots have numerous projections called root hair.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true, but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true and statement 2 is false.

D
Both statements 1 and 2 are false.

Solution

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. The root hair increase the surface area of the root for the absorption of water and mineral nutrients dissolved in water.
Question 16
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The above figure gives the characteristics of the organ X. Which of the following sentences is correct about X?

A
Urine enters X via urethra.

B
Urine exits X via ureters.

C
Urine enters X via the ureters.

D
Urine neither enters nor exits X.

Solution

X is a muscular organ, has high elasticity and stores urine; thus, X is urinary bladder. Urine in urinary bladder enters via ureters and exits via urethra. Urinary bladder is not a full organ but a hollow organ.
Question 17
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In kidney, glomerulus is involved in

A
reabsorption of salts

B
urine collection

C
urine formation by blood filtration

D
All of the above

Solution

Blood enters into the Bowman's capsule. It is a cup-shaped unit with a cluster of capillaries known as glomeruli.
From capillaries, which form glomeruli, water and solutes filter out into the space made by Bowman's capsule. Hence, glomerulus is involved in filtration of blood.
Question 18
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Which of the following statements is/are false?

a. Uric acid increases in muscle cells when they are lacking oxygen.
b. The breathing and respiration in woody stem of a plant takes place through the lenticels.
c. Pyruvate can be converted into ethanol and carbon dioxide by yeast.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

This statement is false. Lactic acid increases in muscle cells when they are lacking oxygen.
Question 19
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Seema is a professional singer. Due to continuous practice, she starts to lose her voice. She goes to a doctor who tells her that there is a problem in the

A
larynx

B
pharynx

C
trachea

D
alveoli

Solution

The voice box, or larynx, is the portion of the respiratory (breathing) tract containing the vocal cords, which produce sound. Due to continuous use of her voice box, Seema has started to lose her voice.
Question 20
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Which of the following is a function of magnesium and iron in plants?

A
Energy transfer

B
Stomatal opening

C
Synthesis of chlorophyll

D
Translocation of carbohydrates

Solution

One of the major functions of magnesium (Mg) and iron (Fe) is the synthesis of chlorophyll.