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

Plants are the basic source of

  1. water

  2. carbon dioxide

  3. food

  4. manure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants are autotrophs. They can make their own food from inorganic raw materials like water and carbon dioxide obtained from their surroundings. Plants act as the source of food for all the birds and animals, including humans. 

Multiple choice

Which of the following takes place during transpiration?

  1. The process by which water is converted from its liquid form to its vapour form.

  2. The absorption of water from air in plants.

  3. The process of water movement through a plant and its evaporation from aerial parts.

  4. The process of preparation of food by plants through absorption of water from soil.

  5. The process in which evaporated water converts back into droplets.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Correct. The process of water movement through a plant and its evaporation from aerial parts is transpiration.  It occurs chiefly at the leaves while their stomata are open for the passage of CO2 and O2 during photosynthesis.

Multiple choice

Which of the following adaptations is/are there in floating plants?

a. Poorly developed root hair b. Thin and flexible stem c. Long and thin leaves

  1. Only a

  2. Only b

  3. Only c

  4. Only a and b

  5. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is correct. Both these adaptations have been made by floating plants, such as water lily. Floating plants like water lily have poorly developed roots and root hair as water is not a problem to them. Floating plants have a thin and flexible stem so that they can sway and bend with the water movements and pressure.

Multiple choice

While walking in the evening in a garden Somu's shoes touched the leaves of a plant. Immediately the leaves of the plant folded. This is because______.

  1. all plants close their leaves in the evening

  2. plant was dying

  3. there was less sunlight so the leaves of the plant folded

  4. the leaves of the plant were responding to touch

  5. plants are afraid of humans and close their leaves after a touch
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is a right answer. The plant which Somu's shoe touches was a 'touch me not'. This plant closes its leaves after getting a touch, as it is a very sensitive plant and responds immediately after getting touched.

Multiple choice

Suresh removed part X of a plant. After removing that part of the plant the plant died because it cannot get water. What is the part X of the plant?

  1. Leaf

  2. Flower

  3. Bud

  4. Root

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

Roots originate from the lower portion of a plant and they are in the soil. Their functions are to absorb nutrients and moisture and anchor the plant in the soil. This is a right answer. If we remove roots of a plant, then plant will not be able to absorb water and will die very soon.

Multiple choice

The specific characteristic present in the leaves of C4 plants is the presence of

  1. bulliform cells

  2. parallel venation

  3. dimorphic chloroplasts

  4. stomata which open at night
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

C4 plants possess dimorphic chloroplasts - bundle sheath chloroplasts are larger and lack grana, while mesophyll chloroplasts are smaller with well-developed grana. This Kranz anatomy is an adaptation for efficient carbon fixation. Bulliform cells and parallel venation are general monocot features, while night-opening stomata characterize CAM plants.

Multiple choice

Which of the following statements is/are false?

a. The aquatic plants use the carbon dioxide gas dissolved in water for carrying out photosynthesis. b. In narrow-leaved plants, the stomata occurs only in the narrow surface of the leaf. c. The opening and closing of the stomatal pores is controlled by the guard cells.

  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
C Correct answer
Explanation

This is the correct option as this statement is false. In narrow-leaved plants, the stomata are equally distributed on both the sides of the leaf.

Multiple choice

Which of the following statements is/are false?

a. The xylem vessel is a non-living, long tube which runs like a drain pipe through the plant. b. Xylem vessels contain cytoplasm and nuclei. c. In flowering plants, either only xylem vessels transport water or both xylem vessels and tracheids transport water.

  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
C Correct answer
Explanation

This is the correct option as this statement is false. Xylem vessels do not contain cytoplasm or nuclei.

Multiple choice

Which of the following statements is true for C4 plants?

  1. Grana is present in mesophyll cells and absent in bundle sheath cells.

  2. Grana is absent in mesophyll cells and present in bundle sheath cells.

  3. Grana is present in both mesophyll and bundle sheath cells.

  4. Grana is absent in both mesophyll and bundle sheath cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chloroplasts of the mesophyll cells contain grana, whereas bundle sheath chloroplasts are almost devoid of grana.

Multiple choice

What is the name of water conducting channel in plants?

  1. Xylem

  2. Phloem

  3. Stomata

  4. Lenticels

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Xylem is the vascular tissue in plants that conducts water and dissolved minerals upward from roots to leaves. Phloem transports food/sugars, while stomata and lenticels are structures for gas exchange. The word 'channel' here refers to the conducting tissue system.

Multiple choice

What does hyponasty term refers to?

  1. Growth is less on the lower surface of the leaf.

  2. Growth is more on the lower surface of the leaves.

  3. There is no growth on the upper surface of the leaves.

  4. Growth is equal on both the surfaces.

  5. All the above are correct.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An upward bending of leaves or other plant parts, resulting from growth of the lower side is called hyponasty.