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NEET • BIOLOGY • TRANSPORT IN PLANTS
Transport in plants practice · Medium
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181
Medium
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Remembering
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Plant obtain carbon and most of their oxygen from
View answer and explanation
Correct option: C
from the atmosphere
Option C is correct. Plants obtain carbon and most of their oxygen from the atmosphere through photosynthesis and respiration.
182
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Remembering
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“Porins” are chemically?
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Correct option: C
Proteins
Option C (Proteins) is correct because porins are channel-forming proteins found in the outer membranes of bacteria, mitochondria, and chloroplasts.
183
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Remembering
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Loss of water in the form of vapours from the living tissues of aerial plant parts is called
View answer and explanation
Correct option: A
Transpiration
Option A (Transpiration) is correct because transpiration is defined as the loss of water vapor from aerial parts of a plant.
184
Medium
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Analyzing
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Which of the following statements is incorrect?
(i) Less than 1 per cent of the water reaching the leaves is used in photosynthesis.
(ii) Most of the water flow in the roots occurs via the apoplast pathway.
(iii) Suction through a straw is an example of positive hydrostatic pressure.
(iv) Turgor pressure is responsible for enlargement and extension growth of cells.
(i) Less than 1 per cent of the water reaching the leaves is used in photosynthesis.
(ii) Most of the water flow in the roots occurs via the apoplast pathway.
(iii) Suction through a straw is an example of positive hydrostatic pressure.
(iv) Turgor pressure is responsible for enlargement and extension growth of cells.
View answer and explanation
Correct option: C
Only (iv)
Option B (Only (ii)) is correct because statement (ii) is incorrect. Most of the water flow in the roots occurs via the symplast pathway, not the apoplast pathway due to the Casparian strip.
185
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Remembering
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Phloem sap is mainly ….. and Choose the correct pair of options?
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Correct option: A
Water, sucrose
Option A (Water, sucrose) is correct because phloem sap is mainly composed of water and sucrose.
186
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Analyzing
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Study the following and identify the mismatch
View answer and explanation
Correct option: A
Simple diffusion – S.P.M
Option A (Simple diffusion – S.P.M) is correct because simple diffusion does not require a semi-permeable membrane (SPM).
187
Medium
187 of 205
Remembering
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Which of the following theories for ascent of sap was proposed by an eminent Indian scientist J C Bose?
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Correct option: A
Pulsation theory
Option A (Pulsation theory) is correct because J.C. Bose proposed the Pulsation theory for the ascent of sap.
188
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Remembering
+4 | -1
Element involved in the opening and closing of stomata, stomatal regulation is
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Correct option: C
Potassium
Option C (Potassium) is correct because potassium ions are involved in the opening and closing of stomata.
189
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Remembering
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When a carrier protein facilitates the movement
of two molecules across the membrane in
same direction, it is called:
of two molecules across the membrane in
same direction, it is called:
View answer and explanation
Correct option: A
Symport
Option A (Symport) is correct because symport refers to the transport of two different molecules across a membrane in the same direction using a carrier protein.
190
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Remembering
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Attraction of water molecules to polar surfaces is known as
View answer and explanation
Correct option: D
Adhesion
Option D (Adhesion) is correct because adhesion is the attraction between water molecules and other polar surfaces.
191
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Understanding
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Read the following statement and choose the correct one from the codes given below
I. The apoplastic movement of water takes place exclusively through intercellular spaces and cell wall without crossing any membrane
II. Symplastic movement occurs from cell to cell through plasmodesmata, ., adjacent cells are connected through plasmodesmata
III. Permeability of a membrane depends on its composition and chemical nature of the solute
IV. Solutes present in a cell increases the free energy of the water or water potential
I. The apoplastic movement of water takes place exclusively through intercellular spaces and cell wall without crossing any membrane
II. Symplastic movement occurs from cell to cell through plasmodesmata, ., adjacent cells are connected through plasmodesmata
III. Permeability of a membrane depends on its composition and chemical nature of the solute
IV. Solutes present in a cell increases the free energy of the water or water potential
View answer and explanation
Correct option: A
I, II and III
Option A (I, II and III) is correct because statements I, II, and III accurately describe apoplastic and symplastic water movement and membrane permeability.
192
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Application
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How many litres of water is absorbed by 10 corn plant in 50 days?
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Correct option: C
1500 lits
Option C (1500 lits) is the most reasonable estimate for the amount of water absorbed by 10 corn plants in 50 days, considering the high transpiration rate of corn.
193
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Understanding
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Why all the minerals present in soil can not be passively absorbed by roots?
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Correct option: C
Due to more concentration of ions in root interior than in soil
Option C (Due to more concentration of ions in root interior than in soil) is correct because minerals need to be actively transported into the roots against their concentration gradient.
194
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Remembering
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Which of the following theory gives the latest explanation for the closure of stomata?
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Correct option: D
Active potassium ion transport theory
Option D (Active potassium ion transport theory) is correct because it is the most current and widely accepted explanation for stomatal closure and opening.
195
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Understanding
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Water potential gradient can be best defined as
View answer and explanation
Correct option: B
The overall movement of water
Option B (The overall movement of water) is correct because water potential gradient drives the movement of water from areas of high water potential to areas of low water potential.
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196
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Remembering
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In companion cells, during translocation, organic nutrient is loaded mainly in the form of
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Correct option: A
Sucrose
Option A is correct because during translocation, organic nutrients are loaded mainly in the form of sucrose in companion cells.
197
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Understanding
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Water potential increases due to
View answer and explanation
Correct option: D
Increase in pressure
Option D (Increase in pressure) is correct because an increase in pressure potential directly increases the overall water potential.
198
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Understanding
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What is required for the transport of substances through a membrane from a region of lower
concentration to higher concentration?
concentration to higher concentration?
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Correct option: A
Input of energy
Option A (Input of energy) is correct because transport of substances against their concentration gradient, from a region of lower concentration to a region of higher concentration, requires active transport, which necessitates an input of energy.
199
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Remembering
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The process by which water is absorbed by solids like colloid causing them to increase in volume, is called
View answer and explanation
Correct option: C
Imbibition
Option C (Imbibition) is correct because imbibition is the process of water absorption by colloids, leading to an increase in volume.
200
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Remembering
+4 | -1
Which of the following cells are not related to the structure of stomata?
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Correct option: A
Sclerenchymatous cells
Option A is correct. Sclerenchymatous cells are not directly related to the structure of stomata; they provide support and rigidity to other plant tissues.
201
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Analyzing
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Select the incorrect pair from the following.
View answer and explanation
Correct option: D
Phloem transport - B, Cu
Option D (Phloem transport - B, Cu) is correct because while Boron (B) is involved in phloem transport, Copper (Cu) is not directly associated with it. Copper is more related to redox reactions.
202
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Remembering
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The first process by which water enters into the seed coat when a seed is placed in suitable environment for germination is
View answer and explanation
Correct option: D
Imbibitions
Option D (Imbibitions) is correct because imbibition is the initial process of water absorption by the dry seed coat.
203
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Understanding
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PH of guard cells increases during day time due to?
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Correct option: A
Efflux of ions
Option A is correct because the pH of guard cells increases during the day due to the efflux (outward movement) of hydrogen ions (H+).
204
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Remembering
+4 | -1
Water channels are possessed by a membrane to facilitate the movement of hydrophilic substances.
These channels are made up of
These channels are made up of
View answer and explanation
Correct option: B
Eight different type of aquaporin
Option B (Eight different type of aquaporin) is correct because water channels are made up of eight different types of aquaporins.
205
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Understanding
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During flowering, fruit ripening and development period in plants, which part of the plant act as source?
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Correct option: C
Photosynthesising leaves and older leaves
Option C (Photosynthesising leaves and older leaves) is correct because these parts act as sources of carbohydrates during flowering, fruit ripening, and development.
Revision notes and key takeaways
Review TRANSPORT IN PLANTS in your textbook or class notes, then use this set to check your understanding.
Showing 181-205 of 205 questions