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

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

What is the function of prop roots?

  1. To store food

  2. To absorb nutrients

  3. To give support

  4. To attach the plant to any tree or wall

  5. To manufacture food

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

Prop roots of banyan tree like pillars support the heavy branches of the tree. Thus, they give support to the plant. 

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

Which of the following statements is incorrect?

  1. Plasma membrane is the outermost covering of a plant cell.

  2. Plasma membrane allows only selected materials to move in and out of the cell.

  3. Plasma membrane is living.

  4. The movement of water across the plasma membrane is called osmosis.

  5. The plasma membrane is flexible.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This statement is incorrect. Thus, it is the correct answer. Plasma membrane is the outermost covering of an animal cell. Cell wall is the outermost covering of a plant cell.

Multiple choice

Which of the following allows uptake of water by root hair through osmosis?

  1. Higher concentration of water molecules in root cells.

  2. Increased surface area of roots by root hairs

  3. Low concentration of water molecules in soil.

  4. Semi permeability of plasma membrane of root hair cells.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Osmosis occurs across semi permeable membrane. It allows movements of water from soil (high concentration of water) to the root hair (low concentration of water)

Multiple choice

Which of the following is TRUE for epiblema?

  1. It is the skin of root which outgrows to form root hair.

  2. It consists of specialized cells that provide flexibility to the stem.

  3. It helps in transportation of minerals and water to leaves.

  4. It is responsible for the process of transpiration.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Epiblema is the skin of root which outgrows to form root hair.