Biology

Plant Transport and Physiology

2,012 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

Diffusion is a means of transport in plants. Which of the following is not a property of diffusion?

  1. In diffusion, no energy expenditure takes place.

  2. Molecules move in a random pattern.

  3. Movement by diffusion is passive.

  4. Diffusion is a very fast process.

  5. The rate of diffusion is affected by temperature and pressure.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as this is not a property of diffusion. Diffusion is a slow process.

Multiple choice

Which of the following statements is/are false?

a. In rooted plants, the transport in xylem is multidirectional. b. Special proteins help moving substances across membranes without expenditure of ATP energy in facilitated diffusion. c. In active as well as passive transport, a major role is played by different proteins in the membrane.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this statement is false. In rooted plants, the transport in xylem is unidirectional, i.e. from roots to the stems.

Multiple choice

In plants, bulk flow is the movement of substances in bulk or en masse from one point to another. In which of the following ways can it be achieved?

a. Positive hydrostatic pressure gradient b. Negative hydrostatic pressure gradient c. Positive concentration gradient

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Bulk flow can be achieved either through a positive hydrostatic pressure gradient or a negative hydrostatic pressure gradient.

Multiple choice

Transpiration is the evaporative loss of water by plants. Which of the following is not a function of transpiration?

  1. It supplies water for photosynthesis.

  2. It transports minerals from the leaves to the other parts of the plant.

  3. It maintains the structure of the plants.

  4. It keeps the surfaces of leaves cool.

  5. It creates transpiration pull.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option as this is not a function of transpiration. It transports minerals from the soil to all parts of the plant.

Multiple choice

Which of the following statements is/are false?

a. Transpiration is the evaporative loss of water by plants through the stomata in the leaves. b. Pinus seeds cannot germinate and establish without the presence of mycorrhizae. c. The inner wall of each guard cell is thin and non-elastic.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. The inner wall of each guard cell is thick and elastic.

Multiple choice

Which of the following is the function of phloem?

  1. It transports food.

  2. It helps in opening and closing of stomata.

  3. It transports water.

  4. It is responsible for the protection of plant.

  5. It prevents the wilting of plants.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transporting food is the function of phloem.

Multiple choice

'Stomata' are useful for

  1. exchange of gases and transpiration

  2. conducting water and dissolved minerals to different parts of the plant

  3. conducting prepared food from green leaves to other parts of the plant

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stomata are microscopic pores primarily found on leaf surfaces that serve two critical functions: gas exchange (CO2 intake for photosynthesis, O2 release) and transpiration (water vapor loss). Option B describes xylem function, and option C describes phloem function. Stomata open and close via guard cells to balance these processes.

Multiple choice

The movements that occur in response to touch are known as

  1. geotropism

  2. hydrotropism

  3. plagiotropism

  4. thigmotropism
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thigmotropism (from Greek 'thigma' meaning touch) is the directional growth movement in response to physical contact or touch. The classic example is the coiling of tendrils around supports. Geotropism is gravity response, hydrotropism is water response, and plagiotropism is growth at an oblique angle to gravity.

Multiple choice

The period of growth is divided into three phases. Which of the following is not a property of the cells of meristematic phase?

  1. The cell walls are primary in nature, thin and cellulosic.

  2. The cells have abundant plasmodesmatal connections.

  3. The cells are rich in protoplasm.

  4. The cells possess large conspicuous nuclei.

  5. Cells enlarge in this phase.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this is not a property of the cells of meristematic phase. Cells enlarge in elongation phase.

Multiple choice

Which of the following statements is/are false regarding the phase of maturation?

a. The cells in this phase attain their maximal wall thickening. b. The cells in this phase attain their maximal protoplasmic modifications. c. The cells in this phase have increased vacuolation.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only c

  5. Only b and c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as this statement is false about the phase of maturation. The cells have increased vacuolation in elongation phase.