Tag: types of plant transport

Questions Related to types of plant transport

Which of the following shows that metabolic energy is required in the absorption of ions

botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

  1. More ions absorption in presence of oxygen

  2. Less absorption of ions in presence of oxygen

  3. More ions absorption in presence of ATP

  4. More ions absorption in presence of NAD

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Correct Option: C
Explanation:

The absorption of ions, involving use of metabolic energy is called active absorption. Energy is generally obtained from ATP.Therefore active absorption is linked to hydrolysis of ATP

Difference between active and passive modes of membrane transport is

botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

  1. Active transport is confined to cations while passive is connected to anions

  2. Active transport is non-selective while passive one is selective

  3. Active transport requires metabolic energy while passive transport requires concentration gradients

  4. Active transport is more rapid.

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Correct Option: A

Active transport of solutes in a living system is?

botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

  1. Unidirectional

  2. Bidirectional

  3. Multidirectional

  4. Cyclic

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Correct Option: A

Choose the correct answer from the alternatives given.
Active transport from outside to inside of molecules across a membrane requires:

botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

  1. cyclic AMP

  2. acetyl chlorine

  3. ATP

  4. lecithin

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Correct Option: C
Explanation:

Active transport, which is the movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration, requires the assistance of a type of protein called a carrier protein, using energy supplied by ATP. So, the correct option is 'ATP'.

Sucrose moves into sieve tube elements by?

botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

  1. Diffusion

  2. Endosmosis

  3. Active transport

  4. Exosmosis

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Correct Option: C
Explanation:

The mechanism used for the translocation of sugars from source to sink is called the pressure flow hypothesis. As glucose is prepared at the source, it is converted to sucrose. This is moved into the companion cells and then into the living phloem sieve tube cells by active transport. Again active transport is necessary to move the sucrose out of the phloem sap and into the cells which will use the sugar converting it into energy. 


Hence, the correct answer is option C.

Select the odd one our w.r.t. porins.

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

  1. Not associated with the inner membrane of plastids

  2. Associated with the outer membrane of mitochondria

  3. Found in outer membrane of gram positive bacteria

  4. Allow movement of low molecular weight hydrophilic substances

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Correct Option: A
Explanation:

Porins are beta barrel proteins that cross a cellular membrane and act as a pore, through which molecules can diffuse. Unlike other membrane transport proteins, porins are large enough to allow passive diffusion, i.e., they act as channels that are specific to different types of molecules. Porins from non-green plastids and from the outer mitochondrial membrane were re- constituted into planar lipid bi-layers. The proteins showed high pore-forming activities and similar single- channel conductance. So, the correct option is "Not associated with the inner membrane of plastids".

Facilitated diffusion can be differentiated from active transport except

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

  1. Energy does not required

  2. Show saturation effect

  3. Accumulation of molecule

  4. (1) and (3) both

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Correct Option: D
Explanation:

In facilitated diffusion ,special proteins help move substances across membranes without expenditure of  ATP energy. While in case of Active transport it uses energy to pump molecules against a concentration gradient .

In both case , transportation rate reaches a maximum when all of the protein transporters are being used (saturation).
So the correct option is 'One and three both' .

The process of facilitated diffusion is different from active transport due to

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

  1. Involvement of membrane protein

  2. Its response to protein inhibitors

  3. Being a downhill process

  4. Saturation of transport

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Correct Option: A

Facilitated diffusion can not cause net transport of molecules from a low to a high concentration because -

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

  1. This would require output of energy

  2. This would require Input of energy

  3. Both (1) and (2)

  4. None of these

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Correct Option: A

The physical process involved in the release of molecular oxygen from leaves is

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

  1. Diffusion

  2. Transpiration

  3. Osmosis

  4. Capillarity

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Correct Option: A
Explanation:

Diffusion is a slow process and is not dependent on a living system. Diffusion is very important to plants since it the only means for gaseous movement within the plant body. Intake of carbon dioxide and release of oxygen through stomata occurs through the process of diffusion. Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.