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 properties of plants shows that they are sensitive?

  1. They grow towards sunlight.

  2. They respire through stomata.

  3. They produce their own food.

  4. They can reproduce.

  5. They grow themselves.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sensitivity means when the things respond to the changes in the surroundings. A plant usually responds to change as it moves or bends towards sunlight. This shows that plants are sensitive and can respond to the changes that occur in surroundings.

Multiple choice

Wilting of the plant occurs when

  1. xylem is blocked

  2. phloem is blocked

  3. both xylem and phloem are blocked

  4. a few roots are removed

  5. apical bud is removed
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Wilting of the plant occurs when there is scarcity of water in the plant. Xylem is responsible for the movement of water throughout the plant. Hence, when the xylem is blocked, it causes wilting of the plant.

Multiple choice

Increase in temperature and velocity of wind cause an increase in transpiration initially but later it slows down because

  1. of closure of stomata

  2. water is not made available to the plant further

  3. the air around the plant becomes humid

  4. of mechanical disturbances

  5. of chemical disturbances
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Increase in temperature and velocity of wind cause an increase in transpiration initially but later it slows down because of closure of stomata.

Multiple choice

The spraying of phenyl mercuric acetate on leaves

  1. increases transpiration

  2. reduces transpiration

  3. increases the rate of photosynthesis

  4. reduces the rate of photosynthesis

  5. causes guttation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The spraying of phenyl mercuric acetate on leaves reduces transpiration.

Multiple choice

In which of the following plants would the metabolism be hindered, if the leaves are coated with wax on their upper surface?

  1. Hydrilla

  2. Pistia

  3. Lotus

  4. Vallisneria

  5. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In lotus plant, the metabolism might be hindered if the leaves are coated with wax on their upper surface. The reason is that the exchange of gases takes place through the leaf surface, present on the upper surface. Since the upper surface of the leaf is above water, hence high frequency of stomata is present on the upper surface only. So, when the upper surface is coated, the gas exchange and other activities will eventually stop.