A plant requires potassium for:

(1) Holding its cells together

(2) Synthesizing chlorophyll

(3) DNA replication

(4) Opening and closing its stomata

Subtopic:  Stomata: 3 | Stomata |
 89%
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NEET 2023 - Target Batch - Aryan Raj Singh
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The water potential of pure water is

(1) zero

(2) less than zero

(3) more than zero, but less than one

(4) more than one

Subtopic:  Plant Water Relations: Water Potential: 2 | Plant Water Relations: Reverse Osmosis & Water potential: 1 | Plant Water Relations: Reverse Osmosis & Water Potential |
 96%
From NCERT
NEET - 2017
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NEET 2023 - Target Batch - Aryan Raj Singh

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

(1) Acidic

(2) Alkaline

(3) Low refractive index

(4) The absence of sugar

Subtopic:  Ascent of Sap |
 68%
NEET - 2016
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NEET 2023 - Target Batch - Aryan Raj Singh
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Root pressure develops due to

1. active absorption

2. low osmotic potential in soil

3. passive absorption

4. increase in transpiration

Subtopic:  Radial Transport |
 53%
From NCERT
NEET - 2015
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NEET 2023 - Target Batch - Aryan Raj Singh

A column of water within xylem vessels of tall trees does not break under its weight

because of

1. dissolved sugars in water

2. tensile strength of water

3. lignification of xylem vessels

4. positive root pressure

Subtopic:  Transpiration Pull: Illustration |
 68%
From NCERT
NEET - 2015
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Transpiration and root pressure cause water to rise in plants by

1. Pulling it upward

2. pulling and pushing it, respectively

3. pushing it upward

4. pushing and pulling it, respectively

Subtopic:  Transpiration & Guttation |
 68%
From NCERT
NEET - 2015
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

In a ring girdled plant ?

1. the shoot dies first

2. the root dies first

3. the shoot and root die together

4. Neither root nor shoot will die

Subtopic:  Phloem Translocation |
 64%
NEET - 2015
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which one gives the most valid and recent explanation for stomatal movements?

1. Transpiration

2. Potassium influx and efflux

3. Starch hydrolysis

4. Guard cell photosynthesis

Subtopic:  Stomata: 3 | Stomata |
 73%
NEET - 2015
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Which of the following criteria does not pertain to facilitated transport?

1. Requirement of special membrane proteins

2. High selectivity

3. Transport saturation

4. Uphill transport

Subtopic:  Means of Transport: Passive |
 85%
From NCERT
NEET - 2013
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Which one of the following elements in plants is not remobilised?

1. Calcium

2. Potassium

3. Sulphur

4. Phosphorus

Subtopic:  Phloem Translocation | Photosynthesis Transpiration Compromise & Mineral Translocation |
 85%
From NCERT
NEET - 2011
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh