Transport in Plants Test

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Transport in Plants Test - 13

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Question 1
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Which of the following opposes the osmosis?

A
Concentration

B
Volume

C
Temperature

D
Pressure

Solution

Concentration, volume and temperature change directs and increases the rate of osmosis.
Pressure opposes the osmosis as it prevents the flow of solvent across the membrane. When osmotic pressure is applied to the system, the osmosis stops.
So the correct answer is 'Pressure'.
Question 2
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Wooden doors swell up during rainy season due to ___________.

A
Endosmosis

B
Imbibition

C
Capillarity

D
Exosmosis
Question 3
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Which of the following is related with transfer of food material?

A
Xylem

B
Collenchyma

C
Phloem

D
Parenchyma

Solution

Xylem tissue is comprised of dead cells involved in the process of transport of water and minerals. Transport of water is under the influence of transpiration pull and is a physical process.
Phloem tissue is comprised of living cells involved in the process of translocation of sugars. Translocation of sugars requires living cells and is a physiological process. The sugars are transported under the influence of pressure difference between source and sink, which leads to mass flow.
Question 4
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The movement of molecules in phloem is

A
Unidirectional.

B
Bidirectional.

C
Non-directional.

D
Sometimes unidirectional and sometimes bidirectional.

Solution

Phloem is responsible for transport of food and minerals. Food synthesized in photosynthetic parts is translocated to nonphotosynthetic parts through the phloem. Phloem translocates organic substances and inorganic solutes first from leaves to all other parts of the plant and storage organs. Storage organs re-export organic nutrients to those parts which require the same as newly formed leaves and fruits i.e., it is bidirectional.
Thus, the correct answer is option B.
Question 5
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The process in plants that releases water into the atmosphere is known as

A
Run-off.

B
Condensation.

C
Precipitation.

D
Evaporation.

E
Transpiration.

Solution

The loss of water in the form of vapour from the aerial parts of the plant into the atmosphere is called as transpiration. Thus option E is the correct answer.
Question 6
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Transpiration is a process related to

A
Osmosis

B
Diffusion

C
Activated transport

D
Facilated diffusion

Solution

Transpiration is the process of loss of water in form of water vapor from the stomata of the plant. Due to high temperature during the day time the water is lost from the stomata of the plant as a result of high rate of transpiration. When the stomata opens for transpiration, it also allows gaseous exchange. Carbon dioxide is taken in for its fixation by Calvin cycle and oxygen produced during the photolysis is given out. This gaseous exchange takes place by the process of diffusion so, the process of transpiration is related to gaseous exchange.
So, the correct answer is option B.
Question 7
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The process responsible for the movement of water molecules in a solution having different concentrations of solute is

A
Facilitated transport

B
Osmosis

C
Phagocytosis

D
Active transport

E
Exocytosis

Solution

Osmosis is the process of movement of solvent from a solution of low concentration to a solution of high concentration across a semipermeable membrane.
Facilitated transport is movement of molecules across the membrane along their concentration gradient with the help of carrier proteins.
Active transport is the movement of molecules across the membrane against their concentration gradient with the utilisation of energy.
Exocytosis is the process when substances are released out of the cell when the vacuole fuses with the cell membrane.
Phagocytosis is the ingestion of materials by the action of pseudopodia.
So the correct answer is 'Osmosis'.
Question 8
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By which of the following mechanisms is glucose reabsorbed from the glomerular filtrate by the kidney tubule?

A
Osmosis

B
Diffusion

C
Active transport

D
All of the above

Solution

The glomerular filtrate after ultrafiltration enters the proximal convulated tubule (PCT). About 65% of the glomerular filtrate is normally reabsorbed in PCT before it reaches the loop of Henle. These include glucose, amino acids, vitamins, hormones, sodium, potassium, chlorides, bicarbonates, most of the water and some urea. Out of these,
• Na$$^+$$ and K$$^+$$ are reabsorbed through the active transport.
• Glucose and amino acids are reabsorbed through secondary active transport using a co-transporter with sodium.
• Reabsorption of water takes place through osmosis.
• Cl$$^-$$, urea and other solutes are reabsorbed through simple diffusion.
So, the correct answer is 'Active transport'.
Question 9
1 / -0

Which of the following factor is responsible for regulating the size of the potato slices during osmosis?

A
Increased salt concentration

B
Increased pressure

C
Increased temperature

D
Increased humidity

Solution

Osmosis is based on the difference in concentration gradients. This makes the concentration of salt a vital element in regulation. Hence increased salt concentration is the factor responsible for regulating the size of potato slices during osmosis.
So the correct answer is 'Increased sal concentration'.
Question 10
1 / -0

The movement of water molecules into and out of the cells takes place by:

A
Carrier proteins

B
Symport systems

C
Ion channels

D
Osmosis

E
Active transport

Solution

The movement of water molecules in and out of the cell is guided by osmosis.
It often doesn't need special carrier proteins or ion channels. The movement is along the concentration gradient so it is not active transport.
Symport systems are a special kind of water pathways in plants.
So the correct answer is 'Osmosis'.

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Transport in Plants Test - 13

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Transport in Plants Test - 13

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SHARING IS CARING

Question 1

Concentration

Volume

Temperature

Pressure

Solution

Question 2

Endosmosis

Imbibition

Capillarity

Exosmosis

Question 3

Xylem

Collenchyma

Phloem

Parenchyma

Solution

Question 4

Unidirectional.

Bidirectional.

Non-directional.

Sometimes unidirectional and sometimes bidirectional.

Solution

Question 5

Run-off.

Condensation.

Precipitation.

Evaporation.

Transpiration.

Solution

Question 6

Osmosis

Diffusion

Activated transport

Facilated diffusion

Solution

Question 7

Facilitated transport

Osmosis

Phagocytosis

Active transport

Exocytosis

Solution

Question 8

Osmosis

Diffusion

Active transport

All of the above

Solution

Question 9

Increased salt concentration

Increased pressure

Increased temperature

Increased humidity

Solution

Question 10

Carrier proteins

Symport systems

Ion channels

Osmosis

Active transport

Solution

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