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

Which of the following is/are the function(s) of intercalary meristem?

a. Intercalary meristem brings about the elongation of the root and stem. b. Intercalary meristem causes the stem or root to increase in diameter and girth. c. Intercalary meristem produces an increase in the length of organs such as leaves and internodes.

  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
E Correct answer
Explanation

This is the correct option as this is a function of intercalary meristem. It produces an increase in the length of organs such as leaves and internodes.

Multiple choice

Which of the following statements is/are false?

a. Epidermis is one cell thick and is covered with cuticle. b. The cells of cork cambium are rectangular and their protoplasts contain tannins and chloroplasts. c. Each stoma is bounded by a specialised kidney-shaped cell called the guard cell.

  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
E Correct answer
Explanation

This is the correct option as this statement is false. Each stoma is bounded by a pair of specialised kidney-shaped cells called the guard cells.

Multiple choice

Which of the following modified roots help a plant in the process of respiration?

  1. Epiphytic roots

  2. Annulated roots

  3. Floating roots

  4. Haustoria

  5. Assimilatory roots
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

These roots are found in aquatic plants. These roots develop from the nodes of the floating branches. The roots are spongy and are colourless. These roots are present above the level of water. As these roots are spongy and soft, they store air in them, which help the plant in floating. They also help in respiration process.

Multiple choice

Which of the following plant tissues is characterised by the absence of living protoplasm?

  1. Phloem

  2. Collenchyma

  3. Sclerenchyma

  4. Xylem

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

Sclerenchyma is a simple tissue meant for the mechanical function. It is thick-walled and lignified, and is characterised by the absence of living protoplasm. The sclerencyma gives mechanical strength to the plant organ, firmness and stiffness to the part of the plant where it is present.

Multiple choice

Nitrate reductase enzyme forms

  1. nitrogen

  2. amino acid

  3. ammonia

  4. nitrite

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

Nitrate reductse catalyse the conversion of nitrates into nitrites.

Multiple choice

Which of the following statements is/are correct for plant tissues?

  1. They are responsible for the transport of materials in the plants.
  2. They cannot be further divided.
  3. They run parallel from roots to leaves.

  1. Only 1

  2. Only 2 and 3

  3. Only1 and 3

  4. Only 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The complex plant tissues are composed of xylem and phloem. They are responsible for the transport of materials in the plant and they run parallel from roots to leaves.

Multiple choice

Consider the following statements:

  1. In plants, transpiration only takes place through stomata.
  2. Smaller cells are more metabolically active than larger ones.

Which of the given statements is/are incorrect?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 1 is incorrect. Transpiration does not take place through stomata only. Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Statement 2 is correct. The smaller the cell, the more it will be active metabolically, e.g. RBCs which are smaller as compared to other body cells carry the maximum oxygen to body parts. 

Multiple choice

Breeding crops with higher levels of minerals, vitamins or higher protein and healthier fats is called

  1. micropropagation

  2. somatic hybridization

  3. biofortification

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

Biofortification is the process of breeding crops to increase their nutritional value - specifically higher levels of minerals (iron, zinc), vitamins (vitamin A), proteins, or healthier fats. Micropropagation is rapid vegetative propagation. Somatic hybridization combines genomes of two species. Biomagnification refers to increasing toxin concentration up food chains - unrelated to breeding.