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

In which group of plants is root pressure absent?

  1. Angiosperms

  2. Gymnosperms

  3. Short plants

  4. Deciduous trees
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Root pressure is absent in gymnosperms. Transpiration causes negative water vapour pressure in surrounding cells of a leaf. Once this happens, water is pulled into the leaves from surrounding vascular tissues.

Multiple choice

Which of the following is not true about parenchyma?

  1. Cells may be oval, spherical or polygonal.

  2. They are made of dead cells.

  3. They store food and water.

  4. They are present in the stem and roots.

  5. They are thin walled cells with spaces in between them.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sclerenchyma is made of dead cells that are packed together closely. However, parenchyma cells may be oval, spherical or polygonal. The cell wall is thin and there are spaces between the cells. It stores food and water in the roots and stems of the plants.

Multiple choice

Which of the following is not true about xylem?

  1. It conducts minerals.

  2. It is composed of thick, and lignified walls.

  3. It is a living tissue.

  4. It conducts water.

  5. It is hollow and join each other end to end.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Xylem is mostly made of dead cells.

Multiple choice

The morphological changes that are indicative of element deficiency are called deficiency symptoms. The deficiency symptoms of which of the following elements are visible first in the senescent leaves?

a. Manganese b. Iron c. Potassium d. Magnesium

  1. Only a and b

  2. Only a and c

  3. Only a and d

  4. Only c and d

  5. Only b and d
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. The deficiency symptoms of potassium and magnesium are visible first in the senescent leaves.

Multiple choice

Which of the following statements is/are false?

a. The symptom of manganese toxicity in a plant is the appearance of blue spots surrounded by chlorotic veins. b. Toxicity levels of an element may vary in different plants and are difficult to identify. c. Mineral salts are translocated through xylem along with the ascending stream of 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
A Correct answer
Explanation

This is the correct option as this statement is false because prominent symptom of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins.

Multiple choice

Plasma membrane

  1. helps in protein synthesis

  2. regulates the passage of water only into and out of the cell

  3. regulates the passage of water and dissolved substances into and out of cell

  4. protects the organelles of the plant cell

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

The plasma membrane controls the movement of water, ions, nutrients, and waste products into and out of the cell through selective permeability. It does not synthesize proteins (that's ribosomes) or specifically protect plant cell organelles (that's the cell wall's job).