Tag: diffusion

Questions Related to diffusion

Root pressure provides a force which causes

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

  1. Pushing of water in the stem

  2. Pulling of water in the stem

  3. Both A and B

  4. None of these

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Correct Option: A
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.

Supply end in solute transport is

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

  1. Root

  2. Stem

  3. Green leaves and storage organs

  4. Xylem and phloem

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Correct Option: C
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'.

A plant of reed -swamp stage is __________.

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

  1. Juncus

  2. Salix

  3. Trapa

  4. Sagittaria

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Correct Option: D

Periderm includes __________________.

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

  1. Phelloderm, collenchyrna and cortex

  2. Phellem, cambium and cortex

  3. All the tissues between epidermis and pith

  4. Phellogen, phellem and phelloderm

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Correct Option: A

With reference to the water relations of plants, consider the following statements.
a. The mechanical work done by a chemical system during any change at constant temperature is equal to the decrease in its free energy
b. In the case of inhibition, as water continues to move into the imbibing, the water potential of the water in the imbibing becomes less negative
c. Osmotic pressure is directly proportional to the number of solute molecules per solvent.
Which of these statements are correct?

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

  1. $1$ and $2$

  2. $2$ and $3$

  3. $1$ and $3$

  4. $1, 2$ and $3$

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Correct Option: A

Which one of the following compounds is NOT a member of the electron transport chain?

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

  1. Ubiquinone

  2. Cytochrome C

  3. Carnitine

  4. NAD

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Correct Option: A

Choose the correct answer from the alternatives given.
At the time of heavy rain, minerals in upper layers of the soil move downward by a process known as:

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

  1. weathering

  2. leaching

  3. erosion

  4. smearing

Show answer
Correct Option: B
Explanation:

Leaching is draining away from soil, ash, or similar material by the action of percolating liquid, especially rainwater downwards.

So the correct answer is "leaching"

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

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

  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.

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Correct Option: D

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

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

  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.

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Correct Option: A
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'.

The movement of water and minerals in xylem and the movement of phloem sap in phloem is ............... and .................... respectively

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

  1. Unindirectional, bidirectional

  2. Bidirectional, bidirectional

  3. Bidirectional, unidirectional

  4. Unindirectional, unidirectional

Show answer
Correct Option: A
Explanation:

The movement of water and minerals in xylem and the movement of phloem sap in phloem is unidirectional and bidirectional respectively. Plants need water for their growth, and it uptakes water through the roots. Water that is taken by the roots has to reach all the leaves or branches, here the xylem function as transportation of water. Therefore, the movement of water and minerals in xylem is always an unidirectional. Whereas, the movement of phloem is bidirectional this is because, once the food is synthesized it is the phloem that transfers the food to all the parts of plants wherever it is necessary.

So, the correct answer is option A.