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 of the following is the most accepted theory of ascent of sap?

  1. Capillary theory

  2. Root pressure theory

  3. Pulsation theory

  4. Transpiration theory

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

The cohesion of water explains only maintenance of the sap column. The explanation for the upward movement of the water is accounted for by a mechanism, called transpiration pull, that involves the evaporation of water from leaves. It is the most accepted theory for ascent of sap.

Multiple choice

Water supply in plants is due to

  1. osmosis

  2. imbibition

  3. guttation

  4. adhesion force

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

In plants, adhesion forces water up the columns of cells in the xylem.

Multiple choice

Tropic movements occur as a result of

  1. multidirectional effect of environmental factors on plant organs

  2. unidirectional effect of environmental factors on the plant organs

  3. bidirectional effect of environmental factors on plant organs

  4. senescence of plant organs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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Multiple choice

The water available to plants for absorption is

  1. gravitational water

  2. capillary water

  3. hygroscopic water

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

Capillary water is the water that remains in the soil after the water drains. It permits plants to survive through periods of drought.

Multiple choice

Which of the following is the cause of guttation?

  1. Root pressure

  2. Osmosis

  3. Transpiration force

  4. Cohesive force

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Guttation is caused due to a positive hydrostatic pressure (root pressure) that develops in the xylem ducts of the root.

Multiple choice

Geotropism is defined as

  1. movement of a part of plant in response to water

  2. movement of a part of plant in response to a chemical stimulus

  3. movement of a part of plant in response to gravity

  4. movement of a part of plant in response to light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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