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 botany breath and blood of life stomata and transpiration transport in organisms long distance transport of water different types of circulatory systems

The process in which loss of water occurs in the form of water vapour is

  1. Respiration

  2. Guttation

  3. Transpiration

  4. Exosmosis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Respiration  is a process in which living organisms produces energy, with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
Guttation is the loss of water in the form of water droplets from hydathodes (small pores) on the leaf margin of a plant.
Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.
The passage of material through a semi-permeable membrane from a region of higher to a region of lower concentration, especially the passage of water through a cell membrane into the surrounding medium, is called exosmosis. 
Thus, the correct answer is option (C). 
Multiple choice botany breath and blood of life stomata and transpiration transport in organisms long distance transport of water different types of circulatory systems

A leafy twig of mesophytic plant dipped in water would demonstrate 

  1. Photosynthesis

  2. Transpiration

  3. Respiration

  4. Gutttation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Mesophytic plants are the plants which grow in the areas/lands which is not too dry not too wet.
When this type of plant is dipped in water (making hydrophytic) then it will demonstrate transpiration More will be the amount of water and more will be the transpiration rate.
Biochemical processes like photosynthesis, respiration and guttation do not depend upon the nature of land but transpiration depends upon the amount of water present in the soil.
So, the correct answer is 'Transpiration'.
Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

In which part of the plant, the rate of respiration is higher?

  1. Root and stem tip

  2. Buds

  3. Germinating seeds

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The highest rate of respiration are found in the actively growing root and stem tips, cambium and embryos of germinating seeds and lowest rates in dormant seeds or spores. As, the growing tips are generally rich in meristematic tissues the rate of respiration is also high.

Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

Correct statement is 

  1. Roots of plant respire through lenticels and stomata.

  2. Stem of plant respire through lenticels.

  3. Both A and B are correct.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All parts of the plant respire, the leaves, the stem, the roots and even the flowers. The parts above the soil get their oxygen directly from the air through pores. The pores in the leaves are called stomata. The pores in stems of trees are called lenticels.

Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

Stomata perform the function of

  1. Gaseous exchange

  2. Oxygen evolution

  3. Carbon dioxide evolution
  4. $CO _2$ absorption.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The stomata control gas exchange in the leaf. Each stoma can be open or closed, depending on how turgid its guard cells are. In the light, the guard cells absorb water by osmosis, become turgid and the stoma opens. In the dark, the guard cells lose water, become flaccid and the stoma closes.
So, the correct answer is 'Gaseous exchange'.
Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Supply ends in transport of solute are

  1. Green leaves and storage organs

  2. Root and stem

  3. Xylem and phloem

  4. Hormones and enzymes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Source and sink are important concepts in translocation in plants. In plants, organic solutes are translocated from regions of their synthesis like green leaves or storage organs like tubers in stem and roots to the region of their active utilisation like the regions of active growth at tips of stem and roots. Thus green leaves and storage organs act as source, whereas regions of active growth act as sink for organic solutes.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Factors like plasmolysis, deplasmolysis, root pressure, turgidity, flacidity in plants are responsible for

  1. Absorption of water and minerals in plants

  2. Movement of water and minerals inside roots of the plants

  3. Movement of water and minerals upward in the stem

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The absorption of water and minerals from the soil by the roots of plants and their movement inside roots of the plant and subsequently its upward movement in stem and other aerial parts of the plant body is because of the following phenomenon:-
Imbibition
Diffusion
Osmosis
Osmotic pressure
Root pressure
Turgidity and flacidity
Plasmolysis and deplasmolysis 

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Which of the factor is responsible for absorption and water and minerals in plants ?

  1. Plasmolysis

  2. Turgidity

  3. Osmotic pressure

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The absorption of water and minerals from the soil by the roots of plants and their movement inside roots of the plant and subsequently its upward movement in stem and other aerial parts of the plant body is because of the following phenomenon:-
Imbibition
Diffusion
Osmosis
Osmotic pressure
Root pressure
Turgidity and flacidity
Plasmolysis and deplasmolysis

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Ringing experiment is to show

  1. Translocation of food

  2. Passive absorption

  3. Stomatal opening and closing

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In ringing experiment a complete ring of tissue is removed outside the vascular cylinder at a particular height from ground in a dicot plant. As the xylem is intact water can move freely to the aerial parts from roots. But the sugars cannot move down to roots from aerial parts, because of the removal of phloem tissue, which occurs in the outer cylinder and is removed in ringing experiment. 

A prominent swelling is observed just above the point of removal of ring of tissue due to accumulation of sugars. This experiment proves the respective roles of xylem and phloem in transportation of water and sugars.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

I. Assertion: sugar is translocated to buds for growing them into flowers.
II. Reason:  xylem transport food through the plant.

  1. I and II both are correct and II is correct explanation for I

  2. I is correct and II is incorrect

  3. I and II both are false

  4. I and II both are correct but II is not correct explanation to I
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The increased contents within the cells exert a high amount of pressure on their wall. This pressure moves the food material to the adjacent cells with low pressure. This allows the phloem to move material according to the plants needs.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Root pressure provides a force which causes

  1. Pushing of water in the stem

  2. Pulling of water in the stem

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Root pressure provides a force which causes pushing of water in a stem. A continuous flow of water is maintained in the plants because the leaves transpire water through stomata and to replace the lost water the water drawn by the roots moves up.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Supply end in solute transport is

  1. Root

  2. Stem

  3. Green leaves and storage organs

  4. Xylem and phloem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
(A)Root is the absorption end of the plant.
(B)The stem is the anchorage end of the plant.
(C)Leaf is the supply end of the plant.
(D)Xylem and phloem are the conducting ends.
So, the correct answer is 'Green leaves and storage organs'.
Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Read the given statements and selected the correct option.
Statement 1: Xylem transport is unidirectional.
Statement 2: Phloem transport is bidirectional.

  1. Both statement 1 and 2 are correct and statement 2 is the correct explanation of statemnet 1

  2. Both statement 1 and 2 are correct and statement 2 is not the correct explanation of statement 1

  3. Statement 1 is correct and statement 2 is incorrect

  4. Both statement 1 and 2 are correct.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Xylem transport is primarily unidirectional (roots to leaves) due to transpiration pull. Phloem transport is bidirectional (source to sink), as sugars can be moved to various parts of the plant depending on metabolic needs.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

The primary difference between the aopolast and the symplast is that the

  1. apoplast is nonliving spaces and cell walls

  2. apoplast relies on active transport

  3. symplast is nonliving spaces and cell walls

  4. apoplast prevents passive diffusion.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Apoplast and symplast are two routes used by plants to transport water from root hair cells to the xylem of the root. Apoplast includes the non-living components of a plant such as cell walls and the intracellular spaces. The main difference between apoplast and symplast is their mechanism of the water movement.

So, the correct option is 'apoplast is non-living spaces and cell walls'.