Transport in Plants Test

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Transport in Plants Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

5 grams of raisins were placed in distilled water for 24 hours. The weight of soaked raisins was found to be 7 grams. The percentage of water absorbed by raisins should be

A
$$\frac{(7-5) g}{5 g}\times \frac{1}{100}$$

B
$$\frac{(7-5) g}{7 g}\times \frac{1}{100}$$

C
$$\frac{(7-5) g}{5 g}\times 100$$

D
$$\frac{(7-5) g}{7 g}\times 100$$
Question 2
1 / -0

Plasmolysis in a plant cell is defined as

A
Break down (lysis) of plasma membrane in hypotonic medium

B
Shrinkage of cytoplasm in hypertonic medium

C
Shrinkage of nucleoplasm

D
None of the above

Solution

Plasmolysis in a plant cell is defined as the process of shrinkage of the cytoplasm as a result of loss of water from the cell. It occurs when plant cells are placed in a solution that has a higher concentration of solutes than the cell does. In this, plant cell is kept in hypertonic solution. When cell is placed in hypotonic solution, cell is lysed.
Thus, the correct answer is option B.
Question 3
1 / -0

The following are the steps in the procedure to determine the percentage of water
absorbed by raisins.
(i) Take a measuring cylinder and place raisins in it
(ii) Pour water so that the raisins are dipped fully well
(iii) Note down the initial weight of raisins.
(iv) Next day note down the final weight of the soaked raisins.
The proper sequence of the above steps is -

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

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

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

D
(i), (ii), (iv), (iii)
Question 4
1 / -0

Following are the few definitions of osmosis. Read carefully and select the incorrect definition.

A
Movement of solute molecules from a lower concentration of water to a higher concentration of solution through a semipermeable membrane.

B
Movement of solvent molecules from lower solute concentration to higher solute concentration.

C
Movement of solute molecules from higher concentration to lower concentration of solution through a permeable membrane.

D
All of the above.

Solution

Osmosis is defined as the movement of solvent molecules from a lower concentrated solution to a higher concentrated solution through a semi-permeable membrane. Hence all the definitions are wrong. The correct answer is option D.
Question 5
1 / -0

In case, respiration is inhibited by some inhibitor, the nonosmotic active absorption of water will

A
Decrease

B
Increase

C
Remain same

D
None of the above

Solution

Osmosis is transport of solvent or water across semi permeable membrane along the concentration gradient. Osmosis is a type of passive transport and does not involves energy input. Active transport occurs against the concentration gradient and requires input of energy. The energy comes from respiratory activity in the cell. If respiration is inhibited, active transport will decrease.
Question 6
1 / -0

Osmoscope is used for

A
Measuring TP (turgor pressure)

B
Measuring OP (osmotic pressure)

C
Measuring W (water potential)

D
Demonstrating osmosis

Solution

Osmosis is the movement of water molecules from the region of their high concentration to the region of their lower concentration through a semi permeable membrane.
Osmoscope is an instrument to demonstrate osmosis. In a laboratory most commonly used osmoscope is the potato osmoscope, prepared by making a cavity in a potato.
Question 7
1 / -0

The process of transpiration in plants helps in the

A
Opening of stomata

B
Closing of stomata

C
Upward conduction of water and minerals

D
Both B and C

Solution

Transpiration is the loss of water by the stomatal openings of the aerial parts of the plant. This helps in the upward movement of water and minerals from the roots to the leaves by a cohesion-adhesion mechanism.
Question 8
1 / -0

Which of the following is not a function of transpiration?

A
Excretion of minerals

B
Cooling of leaves

C
Uptake of water

D
Uptake of minerals
Solution
- Transpiration is the process of water loss from leaves in the form of vapour.
- It is necessary for transporting minerals from the soil to the plant parts, cooling the plant, moving sugars and maintaining turgor pressure.
- Excretion of minerals does not occur through transpiration.
Thus, option A is correct.
Question 9
1 / -0

Which of the following helps in translocation of food in plants?

A
Xylem

B
Phloem

C
Scelerenchyma

D
Collenchyma

Solution

Phloem helps in translocation of food in plants.
In vascular plants, phloem is the living tissue that carries organic nutrients (known as photosynthate), in particular, sucrose, a sugar, to all parts of the plant where needed. In trees, the phloem is the innermost layer of the bark, hence the name.
The phloem is concerned mainly with the transport of soluble organic material made during photosynthesis. This process of transportation is called translocation.
So, the correct answer is option B.
Question 10
1 / -0

Dead cells of phloem are

A
Companion cells

B
Phloem fibres

C
Phloem parenchyma

D
Sieve tubes

Solution

Phloem is the chief conducting tissue of vascular plants responsible for translocation of organic solutes. The phloem is composed of several different kinds of cells. The basic components are sieve elements, companion cells, phloem parenchyma and phloem fibres. Sieve element is the main component of phloem and these elements are placed one over the other to form a continuous sieve tube. The sieve elements are living elements without nucleus because each sieve cell is present in association with companion cells which contain active protoplasts and cellular organelles. Phloem parenchyma is living parenchymatous cells present as components of phloem. They store food materials in the form of starch and fats. Phloem fibres are the only non-living cells present in association with phloem. They provide mechanical support and give strength and rigidity to the organ.
So, the correct answer is 'Phloem fibres'

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Transport in Plants Test - 25

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Transport in Plants Test - 25

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Question 1

$$\frac{(7-5) g}{5 g}\times \frac{1}{100}$$

$$\frac{(7-5) g}{7 g}\times \frac{1}{100}$$

$$\frac{(7-5) g}{5 g}\times 100$$

$$\frac{(7-5) g}{7 g}\times 100$$

Question 2

Break down (lysis) of plasma membrane in hypotonic medium

Shrinkage of cytoplasm in hypertonic medium

Shrinkage of nucleoplasm

None of the above

Solution

Question 3

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

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

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

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

Question 4

Movement of solute molecules from a lower concentration of water to a higher concentration of solution through a semipermeable membrane.

Movement of solvent molecules from lower solute concentration to higher solute concentration.

Movement of solute molecules from higher concentration to lower concentration of solution through a permeable membrane.

All of the above.

Solution

Question 5

Decrease

Increase

Remain same

None of the above

Solution

Question 6

Measuring TP (turgor pressure)

Measuring OP (osmotic pressure)

Measuring W (water potential)

Demonstrating osmosis

Solution

Question 7

Opening of stomata

Closing of stomata

Upward conduction of water and minerals

Both B and C

Solution

Question 8

Excretion of minerals

Cooling of leaves

Uptake of water

Uptake of minerals

Solution

Question 9

Xylem

Phloem

Scelerenchyma

Collenchyma

Solution

Question 10

Companion cells

Phloem fibres

Phloem parenchyma

Sieve tubes

Solution

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