Tag: types of plant transport

Questions Related to types of plant transport

In apoplast pathway, water moves exclusively through the

bio-chemistry plant physiology active transport and passive transport types of plant transport atp

  1. Plasmodesmata

  2. Cell walls

  3. Intercellular spaces

  4. Both B and C

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Correct Option: D
Explanation:
Apoplast pathway consists of non-living parts of plant body i.e., cell walls and intercellular spaces. In apoplast pathway, water passes from root hair to xylem through the walls of intervening cells without crossing any membrane or cytoplasm. The pathway provides the least resistance to movement of water. However, it is interrupted by the presence of impermeable lingo-suberin casparian strips in the walls of endodermal cells.
So, the correct answer is 'Both B and C'.

When transport proteins simultaneously move two molecules across a membrane in the same direction, the process is called

bio-chemistry plant physiology active transport and passive transport types of plant transport atp

  1. Uniport

  2. Antiport

  3. Symport

  4. Diffusive port

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Correct Option: C
Explanation:
Some carrier proteins allow transport only if two types of molecules move together. This is called cotransport. It is of two types: symport and antiport method. In symport method of cotransport, both molecules cross the membrane in the same direction at the same time. In antiport method of cotransport, both molecules move in opposite direction. When a molecule move across a membrane independent of other molecule, the process is called uniport.
So, the correct answer is 'Symport'.

The type of diffusion in which substance move across the membrane along their concentration gradient in the presence of certain or transport proteins is called as 

bio-chemistry plant physiology active transport and passive transport types of plant transport atp

  1. Simple diffusion

  2. Facilitated diffusion

  3. Osmosis

  4. Active transport

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Correct Option: B
Explanation:
The diffusion of hydrophilic substances along the concentration gradient through fixed membrane transport proteins without involving energy expenditure, is called facilitated diffusion. Facilitated diffusion is very specific as it allows cell to select substances for uptake. It is sensitive to inhibitors as well as show saturation effect. Two major types of transport proteins are known viz, carrier proteins(also called carriers, transporters) and channel proteins. Carrier proteins bind the particular solute to be transported and deliver the same to the other side of the membrane.
So, the correct answer is 'Facilitated diffusion'.

Which of the below mentioned properties is not true with respect to facilitated transport?

bio-chemistry plant physiology active transport and passive transport types of plant transport atp

  1. Requires special membrane proteins

  2. Transport saturates

  3. Uphill transport

  4. Highly selective

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Correct Option: C
Explanation:
Active transport is also known as uphill transport that requires the transport of molecules from a low-concentration region to a high-concentration region.  whereas facilitated transport is the passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins.
So the correct answer is 'Uphill transport'.

When a molecule moves across a membrane independent of other molecules, the process is called (i) Uniport (ii) Symport (iii) Antiport?

bio-chemistry cell membrane active transport and passive transport types of plant transport atp

  1. i

  2. i and ii

  3. i and iii

  4. ii and iii

  5. iii

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Correct Option: A
Explanation:

When a molecule moves across a membrane independent of other molecule, it is called uniport.

When two molecules move simultaneously across the membrane in the same direction, it is called symport.
When two molecules move in opposite direction to each other across the membrane, it is called antiport. Thus, the correct answer is A.

When a molecule moves across a membrane independent of other molecules, the process is called

bio-chemistry cell membrane active transport and passive transport types of plant transport atp

  1. Uniport

  2. Symport

  3. Antiport

  4. None of these

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Correct Option: D
Explanation:

A uniporter is an integral membrane protein that transports a single type of substrate species (charged or uncharged) across a cell membrane. It may use either facilitated diffusion and transport along a diffusion gradient or transport against one with an active transport process. They can be either ion channels or carrier proteins. In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.

So the correct option is 'None of the above'

In the resting state of the neutral membrane, diffusion due to concentration gradients, if allowed, would drive.

botany plant water relation active transport and passive transport types of plant transport atp

  1. $K^+$ into the cell

  2. $K^+$ and $Na^+$ out of the cells

  3. $Na^+$ into the cells

  4. $Na^+$ out of the cell

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Correct Option: A

Which one of the following processes accounts for the accumulation of some ions inside the vacuole of the cell at a higher concentration than in the surrounding medium?

botany plant water relation active transport and passive transport types of plant transport atp

  1. Diffusion

  2. Donnan equilibrium

  3. Energy dependant uptake

  4. Osmosis

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Correct Option: A

Diffusion in gases are _____ than in liquids.

botany plant water relation active transport and passive transport types of plant transport atp

  1. Slower

  2. Faster

  3. Equal

  4. None of these

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Correct Option: B
Explanation:

Diffusion occurs in both liquids and gases and can take place over long distances. Diffusion in gases are much faster than in liquids the diffusion rate of oxygen in air is $1,00,000$ times more than diffusion rate of oxygen in water.

Choose the correct answers from the alternatives given.
Which one of the following does not increase the rate of diffusion?

botany plant water relation active transport and passive transport types of plant transport atp

  1. Decreasing the size of the molecules

  2. Increasing the size of the molecules

  3. Increasing the temperature of the fluid

  4. Increasing the concentration of the molecule

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Correct Option: B
Explanation:

Diffusion is the movement of molecules or ions from the region of their higher concentration to the region of their low concentration. Diffusion is obvious in gases and liquids but rare in solids. Diffusion rates are affected by the concentration gradient, the permeability of the membrane separating different molecules, temperature and pressure. 

Hence, the correct answer is 'Increasing the size of the molecules'.