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

Which movement is found only in dead parts of the plants?

  1. Nyctinastic movement

  2. Geotropic movement

  3. Hydrotropic movement

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

Hygroscopic movement is found only in dead parts of the plants, which are hygroscopic in nature and result either due to loss or gain of water by them from the atmosphere.

Multiple choice

Translocation is the

  1. transport of food from leaves to other parts of the plant

  2. transport of water in non-flowering plants

  3. transport of hormones made by plants in the root and shoot tips

  4. transport of xylem sap through xylem vessels to all parts of the plant

  5. transport of water and minerals through the roots and stem of plants to reach the leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Translocation is the transport of food from leaves to other parts of the plant. 

Multiple choice

Which is correct about transport of conduction of substances?

  1. Organic food moves up through phloem and down by xylem.

  2. Organic food moves up through xylem.

  3. Inorganic food moves upward and downward through xylem.

  4. Organic food moves upward and downward through phloem.

  5. Both inorganic and organic food moves upward through phloem.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phloem is the food conducting tissue of plants. All organic food made in leaves move upward and downward through phloem.

Multiple choice

Which among the following statements does not characterise phloem tissues in higher plants?

  1. The phloem tubes sit on the outside of the xylem.

  2. The movement through the phloem is driven by positive hydrostatic pressures.

  3. Phloem sap helps in sending informational signals throughout vascular plants.

  4. When the plant is an embryo, vascular tissue emerges from cambium tissue.

  5. Messenger RNAs are transported in the phloem through sieve tube elements.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the plant is an embryo, vascular tissue emerges from procambium tissue which is at the center of the embryo. Protophloem itself appears in the mid-vein extending into the cotyledonary node which constitutes the first appearance of a leaf in angiosperms where it forms continuous strands.

Multiple choice

Which among the following statements regarding the upwards water transport by xylem is incorrect?

  1. Metaxylem develops after the protoxylem but before the secondary xylem.

  2. The xylem transports water and soluble mineral nutrients from the roots throughout the plant.

  3. Root pressure is lowest in the morning.

  4. Adhension is the force responsible for the capillary action movement of water.

  5. Transpirational pull requires that the vessels transporting the water are very small in diameter.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Root pressure is highest in the morning, before the stomata open and allow transpiration to begin. Different plant species can have different root pressures even in a similar environment.

Multiple choice

The soil water which is of greatest importance to the plant life is

  1. gravitational water

  2. capillary water

  3. hygroscopic water

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

Capillary water is held in soil pores that plants can readily absorb through their roots. Gravitational water drains away quickly, while hygroscopic and combined water are bound too tightly to soil particles for plant use.

Multiple choice

Match the following:

a. The process of releasing surplus water into air by plants 1. Evaporation
b. The process of changing water into its vapours 2. Water cycle
c. The process of changing water vapours into water 3. Transpiration
d. The journey of water from oceans to atmosphere and back to oceans 4. Condensation

  1. a - 3, b - 1, c - 2, d - 4

  2. a - 3, b - 1, c - 4, d - 2

  3. a - 1, b - 3, c - 4, d - 2

  4. a - 2, b - 1, c - 4, d - 3

  5. a - 3, b - 4, c - 1, d - 2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. The process of releasing surplus water into air by plants is called transpiration. The process of changing water into  vapour is evaporation, changing water vapour into water is condensation, and the journey of water from oceans to atmosphere and back to oceans is water cycle.

Multiple choice

Which of the following is not a characteristics of plants?

  1. Plants have autotrophic mode of nutrition.

  2. Reserve food of plants is glycogen and fat.

  3. Plants do not contain sense organs and nervous system.

  4. Response to external stimuli is slow.

  5. Plants do not contain excretory organs.

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

This is the correct option as this is not a characteristic of plants. Reserve food of plants is not glycogen and fat, but is starch and oil.

Multiple choice

What is the effect of hydrogen fluoride on plants?

  1. It affects germination of seeds, root and stem.

  2. Necrosis and chlorosis

  3. It causes decay of leaves and fruits.

  4. Dryness of bud
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydrogen fluoride causes necrosis and chlorosis in plants.