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

Food is transported to different parts of the plant through

  1. xylem

  2. phloem

  3. cortex

  4. pith

  5. vascular system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Xylem & phloem are called vascular tissues and are present in every part of the plant. This special vessel called phloem, transports minerals from the leaf to different parts of the plant in the form of carbohydrates, sugars and proteins.

Multiple choice

_______ helps in translocation of food in plants.

  1. Xylem

  2. Palisade cells

  3. Root hair

  4. Phloem

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

Phloem is the vascular tissue responsible for the transport of organic nutrients, particularly sucrose, from leaves to other parts of the plant. This process of moving food is known as translocation. Xylem, on the other hand, is primarily responsible for the transport of water and minerals.

Multiple choice

Transpiration and _______ help in transport of water in plants.

  1. translocation

  2. photosynthesis

  3. root pressure

  4. shoot pressure

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

Water transport in plants is driven by two main forces: transpiration pull from the leaves and root pressure from the bottom. Transpiration creates a suction effect that pulls water up the xylem, while root pressure helps push water upwards, especially when transpiration rates are low. Translocation refers to the movement of food, not water.

Multiple choice

Which of the following statements is correct?

  1. Stem absorbs the water and minerals from the soil.

  2. The number of petals and filaments in a flower are equal.

  3. Roots conduct the water to the leaves.

  4. The ovary of a flower contains stigma.

  5. The pattern of veins on leaves is called venation.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct choice. The pattern of veins on leaves is called venation.

Multiple choice

Which of the following is not a function undertaken by the stem?

  1. As a link between roots and other parts of the flower.

  2. As a path for the conduction of water and minerals absorbed.

  3. As a producer of food for the plant.

  4. As a support for holding the plant upright.

  5. As a bearer of flowers and fruit.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is the correct answer. This is not a function of the stem. Leaves are the food factories of the plants.

Multiple choice

When the stomata in a leaf closes, ________________.

  1. carbon dioxide in the air spaces in the leaf decreases

  2. oxygen in the air spaces in the leaf increases

  3. C3 plants carry on photorespiration using oxygen and produce PGA and carbon dioxide

  4. all photosystems as well as photorespiration come to a halt

  5. 1, 2 and 3 are correct
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

When stomata close, gas exchange stops, leading to a decrease in CO2, an increase in O2 (due to light reactions), and the initiation of photorespiration in C3 plants.