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

Stomata is open and close due to ____________.

  1. circadian rhythm

  2. pressure of gases ouside the leaves

  3. pressure of gases inside the leaves

  4. turgor pressure of guard cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Turgor pressure of guard cells controls the opening and closing of stomatal pores. 

Multiple choice

Transpiration rate is dependent upon _________.

  1. stomatal frequency

  2. position of stomata

  3. state of stomata

  4. all of these

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

Rate of transpiration depends upon thefactors like stomatal freguency, position of stomata, the state of stomata (open or close), wind, temperature, humidity, etc.

Multiple choice

In ___________, the shoot bends towards the light source.

  1. phototropism

  2. chemotropism

  3. geotropism

  4. hydrotropism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phototropism is movement of plants in response to light. Movement can be towards or away from light. For example, the growth of shoots towards light shows positive phototropism whereas the growth of roots away from light shows negative phototropism.

Multiple choice

Geotropism is the movement of plant parts in response to __________ as stimulus.

  1. light

  2. gravity

  3. water

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

Geo - earth or gravity Tropism – movement towards stimulus Plants show movements in response to stimuli. The roots of a plant always grow downwards, while the shoots usually grow upwards and away from the earth. This upward and downward growth of shoots and roots, respectively in response to the pull of the earth or gravity is known as geotropism.

Multiple choice

Which of the following statements is incorrect?

  1. Branches, leaves, fruits and flowers grow on stems of plants.

  2. Stems of a plant provide support to the plant.

  3. Stems transport water and minerals from the roots to various parts of a plant.

  4. Stems of a plant bend themselves in the direction opposite to sunlight.

  5. The food made in the leaves is transported to other parts of a plant through stems.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stems of a plant bend themselves towards the direction of sunlight.

Multiple choice

Transfer of water from plants to atmosphere is called

  1. evaporation

  2. transpiration

  3. osmosis

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

Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapour and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves.

Multiple choice

Gravity has what type of effect on plants?

  1. the flower grows up towards the sun

  2. the leaves will lean towards the light

  3. the stem will transport food to the leaves & petals

  4. the roots grow downward in the soil for food and water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gravitropism (or geotropism) is the growth of a plant in response to gravity; roots exhibit positive gravitropism by growing downward.