Biology

Plant Transport and Physiology

1,834 Questions

Access a comprehensive set of questions on plant transport mechanisms and physiological adaptations. Topics include water movement, translocation of food, and plant responses to external stimuli. These biology questions are essential for medical entrance exams and other science competitive tests.

Xylem and phloem transportTranspiration and evaporationPlant adaptationsGeotropic and phototropic responsesWater absorption by rootsRespiration in roots

Plant Transport and Physiology Questions

Multiple choice

Which of the following is not caused by growth movement?

  1. Bending of the shoot of a plant in response to light

  2. Closing up of leaves of a sensitive plant on touching with an object

  3. Climbing up of a plant on an object by using tendrils

  4. Movement of the root of a plant towards a source of water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Closing up of leaves of a sensitive plant on touching with an object is nastic movement, not tropic movement.

Multiple choice

What is oxygen depletion?

  1. Increase in the concentration of oxygen in water

  2. Decrease in the concentration of oxygen in water

  3. Evaporation of oxygen from water

  4. Transpiration of oxygen from plants

  5. Absorption of oxygen by trees
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Due to various types of pollution, concentration of oxygen decreases in the water which is hazardous to aquatic life and humans beings for survival. This is called oxygen depletion.

Multiple choice

Plants do not survive at low temperature because _______.

  1. there is precipitation of cell's protein

  2. cells rupture due to the mechanical pressure of ice

  3. desiccation takes place owning to the withdrawal of water from vacuolated protoplasm

  4. respiration more than photosynthesis

  5. all of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

All the above are the correct answers.

Multiple choice

ABA helps in closure of stomata by ______.

  1. decreasing the movement of K+ out of the guard cell

  2. increasing the rapid movement of K+ out of the guard cell

  3. decreasing the amount of water in the guard cell

  4. increasing the amount of water out of the guard cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rapid movement of potassium ion out of the guard cell causes stomata closure.

Multiple choice

Plants do not survive at low temperature because of _________.

  1. precipitation of cells protein

  2. cells rupture due to the mechanical pressure of ice

  3. desiccation takes place owning to the withdrawal of water from vacuolated protoplasm.

  4. respiration more than photosynthesis

  5. all of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

All of the above are correct answers.

Multiple choice

A plant usually stores its carbohydrates in its fruits. This process shows the conversion of ___________.

  1. kinetic energy to potential energy

  2. mechanical energy to chemical energy

  3. solar energy to chemical energy

  4. chemical energy to mechanical energy

  5. chemical energy to solar energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Green plants absorb sun light during photosynthesis and prepare their own food, in this way plants convert this solar energy in chemical energy.

Multiple choice

When a plant wilts, the sequence of events will be

  1. exosmosis, plasmolysis, deplasmolysis, temporary wilting and permanent wilting

  2. plasmolysis, deplasmolysis, temporary wilting and permanent wilting

  3. exosmosis, plasmolysis, deplasmolysis and temporary wilting

  4. exosmosis, plasmolysis, temporary wilting and permanent wilting

  5. deplasmolysis, temporary wilting, exosmosis and plasmolysis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a plant wilts, the sequence of events will be: exosmosis, plasmolysis, temporary wilting and finally permanent wilting.

Multiple choice

Water will be absorbed by the root hairs when

  1. the plant is rapidly respiring

  2. the concentration of solutes in the cell sap is high

  3. the concentration of solutes in the soil is high

  4. the concentration of solutes in the cell sap is low

  5. the concentration of solutes in the soil is isotonic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water will be absorbed by the root hairs when the concentration of solutes in the cell sap is high due to the process of endosmosis.

Multiple choice

What are the excretory products of plants?

  1. Lignin and cellulose

  2. Cellulose and resins

  3. Resins and gums

  4. Gums and lignin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Resins and gums are the excretory products of plants. In the different parts of the plant body, crystals of some chemical substances are set aside, for example calcium carbonate crystals in the leaf of fig, calcium oxalate crystals in the leaf of colocasia. These excretory materials do not harm the plant. Saprophytic plants such as Mucor, Rhizopus and Penictllium excrete their wastes through diffusion.

Multiple choice

How is oxygen removed from the leaves?

  1. Through dead cells

  2. Through roots

  3. Through stomata

  4. Through cellular vacuoles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants get rid of oxygen through their stomatal pores. Air enters the plant through these openings, and contains carbon dioxide and oxygen, which are used in photosynthesis and respiration, respectively.