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

On exposure to a shock or automated blow the leaflets of Mimosa pudica plant close upwards and its lower portion of petiole contracts. What is this movement called?

  1. Autonasty

  2. Seismonasty

  3. Epinasty

  4. Nyctinasty
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

On exposure to a shock or automated blow the leaflets of Mimosa pudica plant close upwards and its lower portion of petiole contracts—this movement is called Seismonasty, which is the nastic response of plants or fungus to touch.  

Multiple choice

What happens at the time of senescence of the plant?

  1. Secondary plant products accrue in tissues and organs at the time of aging.

  2. Metabolite such as carbohydrates, proteins, etc., are transmitted out of aging leaves to young leaves.

  3. Metabolite such as carbohydrates, proteins, etc., are transmitted out of young leaves to aging leaves.

  4. The plant shows serial senescence of leaves.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

At the time of senescence of the plant the plant shows serial senescence of leaves. In such condition or process the plants degeneration takes place with the age. 

Multiple choice

Which of the following is not associated with the enduring closure of stomata found on photosynthesizing plant organs in few desert plants?

  1. Interfering of stomata by the layer of wax.

  2. Interfering of hollowed stomata from exterior by the sticky masses.

  3. Additional thickening and cutilization of guard cell wall causes the closure.

  4. Rise in turgor pressure in guard cells of hollowed stomata.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rise in turgor pressure in guard cells of hollowed stomata is not associated with the enduring closure of stomata found on photosynthesizing plants organs in few desert plants.

Multiple choice

Why are sieve tubes suited for translocation of food?

  1. Because of bordered pits

  2. Because of no end walls

  3. Because of broader lumen and perforated cross walls

  4. Because of bordered pits and absence of protoplasm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The end walls of sieve tubes are perforated and these perforated end plates are called sieve plates. Pores in these tubes offer less resistance.

Multiple choice

Which of the following is a function of meristem?

  1. Absorption of water

  2. Absorption of minerals

  3. Translocation of food

  4. Growth of plants
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Meristematic tissue helps in plant growth. Throughout the life of the plant, the rate of cell division and cell elongation in the meristems is regulated by plant hormones. 

Multiple choice

Consider the following statements regarding functions of epidermis: (a) It provides mechanical support and strength. (b) It checks the entry of pathogen thus protects internal tissues. (c) It enhances the rate of transpiration by developing cuticle. (d) Exchange of gases occurs through stomata. Which of the above statements is/are incorrect?

  1. Only (a)

  2. Only (b)

  3. Only (c)

  4. Only (d)

  5. Only (c) and (d)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (c) is incorrect. It reduces, not increases, the rate of transpiration by developing cuticle.

Multiple choice

Which of the following is not a function of root of a plant?

  1. To fix the plant firmly to ground

  2. To manufacture food

  3. To absorb water from soil

  4. To prevent soil erosion

  5. To absorb minerals from soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Food is manufactured by green leaves of the plants as they contain chlorophyll, a green pigment that traps sunlight and synthesise food. 

Multiple choice

Each stomatal opening is surrounded by two semilunar cells called guard cells. Which of the following statements about these guard cells is/are correct?

a. They are dead cells. b. The inner walls of these cells are thicker and the outer walls thinner. c. They regulate the opening and closing of stomatal pores.

  1. a only

  2. b only

  3. c only

  4. a and c

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

This is the correct answer as both these statements are correct about the guard cells.

Multiple choice

Ameoba acquires its food through the process of

  1. osmosis

  2. diffusion

  3. exocytosis

  4. endocytosis

  5. photosynthesis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer. The process of cellular ingestion by which the plasma membrane folds inward to bring substances into the cell is called endocytosis. Amoeba acquires its food through the process of endocytosis.