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

Openings of stomata are surrounded by ____.

  1. epidermal cells

  2. chloroplast

  3. subsidiary cells

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

Guard cells are specialized cells that surround each stoma and control its opening and closing by changing shape. Epidermal cells form the outer layer, chloroplasts contain chlorophyll for photosynthesis, and subsidiary cells may support guard cells but don't directly control stomata.

Multiple choice

Plants can get along well without any respiratory organs as

  1. each plant part takes care of its own gas-exchange needs

  2. living cells in a plant are superficial

  3. photosynthesis provides them energy

  4. Both (1) and (2)

  5. All (1), (2) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is correct as both the options are true regarding respiration without any specialised respiratory organs.

Multiple choice

In Xerophytes the deficiency is of

  1. Water

  2. Chlorophyll

  3. Mineral salts

  4. Air
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Xerophytes are plants adapted to arid environments where water is scarce. They have developed specialized features like reduced leaves, thick cuticles, and extensive root systems to minimize water loss and maximize water uptake, making water their primary limiting factor.

Multiple choice

On which principle does a potometer work?

  1. Potential difference between the tip of the tube and that of the plant

  2. Amount of water absorbed equals the amount transpired

  3. Osmotic pressure

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

 Potometer works on the principle that amount of water absorbed equals the amount transpired. There are two main types of potometers used - the bubble potometer and the mass potometer.

Multiple choice

Which of the following statements is/are true regarding the function of veins in a leaf? a) It gives a beautiful look. b) It provides rigidity to the leaf blade. c) It gives the leaf its green colour. d) It helps in transport of food and water.

  1. a and d

  2. b and d

  3. c and d

  4. a and c

  5. a, b and d
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. Leaf gets strength to stand firm with the help of veins and these veins work as channels to transport water, food and minerals.

Multiple choice

Which of the following is the increasing order for rate of transpiration?

  1. Cuticular transpiration - Lenticular transpiration - Stomatal transpiration

  2. Lenticular transpiration - Cuticular transpiration - Stomatal transpiration

  3. Stomatal transpiration - Lenticular transpiration - Cuticular transpiration

  4. Stomatal transpiration - Cuticular transpiration - Lenticular transpiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stomatal transpiration forms the major part of overall transpiration. Lenticular transpiration is more than that of cuticular transpiration.

Multiple choice

Which of the following statements is NOT true?

  1. Transpiration is reduced on a cloudy day.

  2. Transpiration is not affected by sunlight.

  3. Stomatal transpiration does not occur at night.

  4. Rate of transpiration is higher during the day.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transpiration is affected by sunlight. Stomata remain open during day and close at night. More transpiration occurs due to presence of sunlight.