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NEET

Explore popular questions from Plant Physiology for NEET. This collection covers Plant Physiology previous year NEET questions hand picked by experienced teachers.

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Plant Physiology

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Q 1. Which one of the following is not a micronutrient?

A

Molybdenum

Potassium

C

Zinc

D

Boron

Explanation

Macronutrients are essential elements which are present in easily detectable quantities, 1 - 10 mg per gram of dry weight. The macronutrients include, carbon, hydrogen, oxygen, nitrogen, phosphorous, sulphur, potassium, calcium and magnesium. Micronutrients or trace elements, are needed in very small amounts (equal or less than 0.1 mg/gm of dry matter). These include iron, manganese, copper,molybdenum, zinc, boron, chlorine and nickel.

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Q 2. Which one of the following elements is almost non-essential for plants?

A

Zn

Na

C

Ca

D

Mo

Explanation

The 16 elements necessary for plants called essential elements, are as : C, H, O, N, P, S, K, Mg, Ca, Fe, Cu, B, Zn, Mn, Mo and Cl.
Zn is essential for the synthesis of tryptophan aminoacid.
Ca is the part of middle lamella, it stabilizes the structure of chromosomes. Mo is responsible for nodulation in legumes. It is a part of nitrate reductase enzyme which helps in nitrogen fixation.
Na is a non-essential element. It seems to be involved in membrane permeability but its essentiality has not been proved.

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Q 3. Which one among the following chemicals is used for causing defoliation of forest trees?

A

Malic hydrazide

{tex} 2,4 -D {/tex}

C

{tex} \mathrm { Amo } - 1618 {/tex}

D

Phosphon D

Explanation

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Q 4. Connecting link between glycolysis and Krebs'cycle before pyruvate entering Krebs' cycle is changed to

A

oxaloacetate

B

PEP

C

pyruvate

acetyl CoA.

Explanation

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Q 5. The conditions necessary for vernalization are

A

high temperature, oxygen and water

low temperature, water and oxygen

C

water, oxygen and carbon dioxide

D

oxygen and water.

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Q 6. The closure of lid of pitcher in pitcher plant is:

A paratonic movement

B

A tropic movement

C

A turgor movement

D

An autonomous movement

Explanation

Paratonic movements are induced by external stimuli.

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Q 7. Guttation is caused due to

A

Imbibition

B

Osmosis

Positive root pressure

D

Transpiration

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Q 8.

Seed dormancy is due to the

A

ethylene 

abscisic acid

C

IAA

D

Starch

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Q 9. See the following diagram when the TP of the cell B increases to 18. What changes would be occur with regard to water movement

A

No movement of water will occurred

B

B actively absorb water form neighbor cell

Cells A,C,D and E absorb water from B

D

Water diffuses into B form outer cell

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Q 10. Refer the given table and select the option that correctly fills the blanks in it.

Property Simple diffusion Facilitated Transport Active transport  
Highly A YES B  
Uphill Transport NO C YES  
Requires ATP NO D YES  

A B C D ?

No, Yes, No, No

B

Yes, Yes, Yes, No

C

No, No, No, Yes

D

No, Yes, Yes, Yes

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Q 11. Go through comparison of different transport process given below

  Simple Diffusion Facilitated
Diffusion
Active
Transport
1 YES YES YES
2 NO YES YES
3 NO NO NO
4 NO YES YES

A

Only I is correct

B

I and II are correct

C

Only II is correct

No one is correct

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Q 12. Which relationship is considered correct for a solution

Ψw = Ψs + Ψp

B

Ψs = Ψw + Ψp

C

Ψw = Ψs

D

Ψp = Ψw

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Q 13.
Initially solution in side A, with respect to side B, is -

A

Hypotonic

Hypertonic

C

Isotonic

D

Lower

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Q 14.  
After the system reaches equilibrium, what changes are observed?

A

The water level is higher in side A than in side B.

B

The water level is higher in side B than in side A

No change is observed

D

First the level of water is high in tube A and then water level is decreased.

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Q 15. Attraction of water molecules to polar surface is known as :

A

Cohesion

Adhesion

C

Capillarity

D

Tencile strength

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Q 16. The lowest water potentials in the xylem are in the -

A

Root hairs

B

Vascular cylinders of root

C

Tracheids of the stem

Leaves

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Q 17. The sap of a plant has Ψs of - 10 bars and there is wall pressure of 2 bars. When this cell is placed in a solution having Ψs of - 3 bars wall pressurecausing water to enter the cell is -

A

- 8 bars

B

- 7 bars

- 5 bars

D

- 3 bars

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Q 18. Statement I - The evolution of the C4 photosynthetic system is probably one of the strategies for maximizing the availability of CO2 while minimizing water loss.
Statement II - C3 plants are twice as efficient as C4 plants in terms of fixing carbon
Statement III - C3 plant loses only half as much water as a C4 plant for the same amount of CO2 fixed.

Which of the given statement/s is or are correct

A

All statements are correct

B

All statements are incorrect

Only statement I is correct

D

Statement II and III are correct

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Q 19. The pressure flow model of translocation depends entirely on the existence of mechanisms for loading sugars into phloem at the ______ regions and for unloading them at the ______ regions -

A

Sink, source

B

Sink, sink

C

Source, source

Source, sink

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Q 20. What is correct for diagram below?

A

Cell "A" will lose H2O, Cell "B" will gain H2O, Cell "C" neither gain nor loses H2O

B

Cell "A" neither gain not loses H2O, Cell "B" will gain H2O, Cell "C" will lose H2O

C

Cell "A" will gain H2O, Cell "B" neither gain nor loses H2O, Cell "C" will lose H2O

Cell "A" will gain H2O, Cell "B" will lose H2O, Cell "C" neither gain nor loses H2O

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Q 21. The diagram shows the appearance of plant cell immersed in a solution which is isotonic to the cell's sap -

Which of the diagram show below most accurately represents the appearance of this cell after immersion in a hypertonic solution?

A

C

D

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Q 22. The accompany diagram show plasmolysis in cell. A is normal turgid cell, B shows incipient plasmolysis and C is plasmolysed cell. Identify W, X, Y and Z  respectively.

Shrunken protoplast, Protoplast, Vacuole, External solution

B

Turgid protoplast, Protoplast, Vacuole, External solution

C

Shrunken protoplast, Flaccid protoplast, Vacuole, External solution

D

Shrunken protoplast, Protoplast, Vacuole, Hypotonic solution

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Q 23. The diagram shows a Potato plant forming new tubers.
Which route would be taken by most of the food at this time?

A

1 → 4 → 2 → 3

6 → 5 → 2 → 3

C

1 → 4 → 5 → 6

D

6 → 5 → 4 → 1

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Q 24. Nobel prize of 1991 for discovering the single ion channels in cell was awarded to

A

Waston and Hargobind Khorana

Erwin Neher and Bert Sakmann

C

Nirenberg and Kornberg

D

Holley and Matthaei

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Q 25. Select the potion which completes the given equation for reductive amination.

A

- Ketoglutaric acid - Transaminase

-Ketoglutaric acid - Glutamate dehydrogenase

C

Asparagine - Glutamate dehydrogenase

D

Glutamine - Transaminase