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

Stomata of CAM (crassulacean acid metabolism) plants are___________.

  1. open during the night and close during the day

  2. always remain open

  3. open during the day and close at night

  4. never open
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

CAM plants are the succulents found in deserts, where carbon dioxide fixation occurs during night. Hence, their stomata remain open during the night.

Multiple choice

A sundew plant shows ______ movement.

  1. seismonastic

  2. chemonastic

  3. photonastic

  4. hydrotropic

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

Sundew plant shows chemonastic movement as it bends its tentacles on its leaves over certain insects, when they touch the leaves.

Multiple choice

The shoot tip of a plant receives water

  1. through water vapours present in air

  2. through vessels and tracheids

  3. through tracheids and xylem fibres

  4. through vessels and parenchyma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The shoot tip of a plant receives water through vessels and tracheids.

Multiple choice

The loss of water from aerial parts of a plant is known as

  1. transpiration

  2. translocation

  3. excretion

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

The loss of water in the form of vapours from the aerial parts of a plant is known as transpiration. It helps in (1) absorption and upward movement of water and minerals dissolved in it from roots to leaves (2) temperature regulation

Multiple choice

Which of the following statements is/are false?

a. The gaseous exchange in plants takes place through the stomata in leaves. b. In addition to leaves, stomata are also present in the roots of the plant. c. In most broad-leaved plants, stomata occur only in the lower surface of the leaf.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

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

Stomata are minute aperture structures on plants found typically on the outer leaf. They are also known as the epidermis.

Multiple choice

Which statement is TRUE about weathering due to plant growth?

  1. the water running of the leaves is more acid than rain

  2. root growth in a crack can cause the rock to crack

  3. there will be more weathering due to the plant in winter

  4. it is a chemical form of weathering

  5. plant has no role in weathering
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, the plant root grows into the narrow cracks,as the plant grows, the roots become thicker and break the rocks.

Multiple choice

Which of the following characteristics help in conservation of water in cactus?

  1. Elongated roots
  2. Presence of large amount of chlorophyll
  3. Waxy coating around the plant body
  4. Reduced leaves into spikes

  1. Only (1), (2) and (3)

  2. Only (2), (3) and (4)

  3. Only (1), (3) and (4)

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Cactus develops long roots to go deep into the ground to get water. - Chlorophyll only helps in photosynthesis; it does not help in conservation of water. -  Waxy coating around the plant body reduces water loss.
    • The leaves of cactus are reduced to spikes resulting less number of stomata and less transpiration.
Multiple choice

Which of the following most nearly means “Efficient”?

Directions: Read the given passage and answer the following question.

Xylem and Phloem. The Xylem is responsible for transporting water and certain nutrients from the root to the rest of the plant. The Phloem carries soluble organic material, i.e. food for the plant, which is produced in the leaves by photosynthesis to the other parts of the plant. The Xylem and phloem are the two types of vascular tissues that are present in plants. They are responsible for transporting water, minerals, food and other organic materials between the roots, stems and leaves of the plant. The Xylem and phloem form vascular bundles with each other, which means that together they are responsible for the efficient transportation of food, nutrients, minerals, and water in the plant, and hence the survival of the plant. Xylem is a type of transport tissue in vascular plants that is responsible for transporting water and certain nutrients from the root to the rest of the plant. Thus, it essentially flows in one direction, that is, from the bottom up to the sky towards the top of the plant. Its main function is to effectively transport water and nutrients from the soil to the various parts of the plant. The word ‘xylem’ is derived from the Greek word ‘xylon’, meaning wood. This is because wood is the best-known xylem tissue which is found throughout the tree. Xylem is a mixture of dead and living tissues, which are non-living at the time of maturity. It is made up of tracheids, vessels, xylem parenchyma, xylem fibres and ray parenchyma. Xylem cells are hard walled cells, which are stacked on top of each other and are mainly found in the center of the stem. Hence, xylem has another function, which is to provide mechanical support to the plant. The Xylem is surrounded by the phloem. The Phloem is the other type of transport tissue in vascular plants. Its main function is to carry soluble organic material, i.e. food for the plant, which is produced in the leaves by photosynthesis to the other parts of the plant. This process is called translocation. To do this effectively it flows both up and down the stem, unlike the xylem, which only flows up. The word ‘phloem’ is derived from the Greek word ‘phloos’, which means bark, as the phloem is the innermost layer of the bark in most trees. The Phloem is made up of sieve cells, sieve tube elements, phloem parenchyma, phloem fibres, and phloem ray cells. It consists of both living and dead soft-walled cells, where the outer phloem is made up of dead cells and the inner phloem is made of living cells.

  1. Inept

  2. Fragile

  3. Idle

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

Efficient and deft are synonyms.

Multiple choice

Xylem and Phloem are responsible for which function in plants?

Directions: Read the given passage and answer the following question.

Xylem and Phloem. The Xylem is responsible for transporting water and certain nutrients from the root to the rest of the plant. The Phloem carries soluble organic material, i.e. food for the plant, which is produced in the leaves by photosynthesis to the other parts of the plant. The Xylem and phloem are the two types of vascular tissues that are present in plants. They are responsible for transporting water, minerals, food and other organic materials between the roots, stems and leaves of the plant. The Xylem and phloem form vascular bundles with each other, which means that together they are responsible for the efficient transportation of food, nutrients, minerals, and water in the plant, and hence the survival of the plant. Xylem is a type of transport tissue in vascular plants that is responsible for transporting water and certain nutrients from the root to the rest of the plant. Thus, it essentially flows in one direction, that is, from the bottom up to the sky towards the top of the plant. Its main function is to effectively transport water and nutrients from the soil to the various parts of the plant. The word ‘xylem’ is derived from the Greek word ‘xylon’, meaning wood. This is because wood is the best-known xylem tissue which is found throughout the tree. Xylem is a mixture of dead and living tissues, which are non-living at the time of maturity. It is made up of tracheids, vessels, xylem parenchyma, xylem fibres and ray parenchyma. Xylem cells are hard walled cells, which are stacked on top of each other and are mainly found in the center of the stem. Hence, xylem has another function, which is to provide mechanical support to the plant. The Xylem is surrounded by the phloem. The Phloem is the other type of transport tissue in vascular plants. Its main function is to carry soluble organic material, i.e. food for the plant, which is produced in the leaves by photosynthesis to the other parts of the plant. This process is called translocation. To do this effectively it flows both up and down the stem, unlike the xylem, which only flows up. The word ‘phloem’ is derived from the Greek word ‘phloos’, which means bark, as the phloem is the innermost layer of the bark in most trees. The Phloem is made up of sieve cells, sieve tube elements, phloem parenchyma, phloem fibres, and phloem ray cells. It consists of both living and dead soft-walled cells, where the outer phloem is made up of dead cells and the inner phloem is made of living cells.

  1. Manufacturing of food

  2. Transportation of food

  3. Photosynthesis

  4. Construction of cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Together they are responsible for the efficient transportation of food, nutrients, minerals, and water in plants.