Porins are not present in 

  • The outer membranes of Plastids 

  • The outer membrane of Mitochondria 

  • The outer membrane of bacteria 

  • Inner membrane of Plastids

 Which of the following is not sensitive to inhibitors? 

  • 1 .Pump 

  • 2 .Diffusion 

  • 3. Facilitated Diffusion 

  • 4. Potions 

Which of the following is correct with respect to Facilitated Diffusion? 

  • Some channels are always open while others can be controlled 

  • All channels are always open 

  • Some channels are closed while others are always open

  • No regulation of channels as such. 

Molecules move in opposite direction across the membrane by the means of a transport protein, such movement is called 

  • Biport 

  • Symport 

  • Antiport 

  • Uniport 

Molecules moves across a membrane independent of other molecules, by the means of membrane protein, the process is called 

  • Biport 

  • Symport 

  • Uniport 

  • Antiport 

Active Transport 

Which of the following is wrong? 

 

  • Uses energy to transport 

  • Uses energy to pump molecules against a concentration gradient 

  • Carried out by specific membrane proteins 

  • Substances are transported from a high concentration to low concentration 

Membrane proteins are for 

 

  • Uphill transport 

  • Downhill transport 

  • Uphill as well as downhill transport only 

  • For Facilitated Diffusion only 

Transport proteins are 

  • 1 .Specific 

  • 2. Sensitive to inhibitors 

  • 3. Show saturation 

  • 4. All of these 

Which of the following is not a common characteristic between Active transport and Facilitated Transport? 

  • Use of ATP 

  • Highly selective 

  • Liable to saturate 

  • Under Hormonal Regulation 

 Water 

Which one is wrong for Water. 

 

  • Provides a medium in which different substances are dissolved 

  • Makes 92% part of watermelon 

  • Makes 30-45% part of most herbaceous plants 

  • Present in dry seeds as well 

Transpiration 

  • Loss of water in soil 

  • Loss of minerals in soil 

  • Loss of water to the air from the leaves 

  • Loss of organic substances because of photorespiration 

 A mature corn plant absorbs…….. of water in a day while a mustard plant absorbs water equal to its own weight in about…….. 

  • 5L, 3hours 

  • 3L, 5 hours 

  • 5L, 5 hours 

  • 3L, 3 hours 

Water is often a major limiting factor in

  • Photosynthesis

  • Respiration

  • Photorespiration

  • Plant Growth and Productivity

Which of the following is the two major components of water potential

  • Solute potential and osmotic pressure

  • Solute potential and pressure potential

  • Osmotic pressure and turgor pressure

  • Osmotic pressure and solute concentration

Water molecules show a motion

  • Random

  • Rapid

  • Constant

  • All of these

The greater water potential actually does not suggest the

  • Greater concentration of water

  • Greater Kinetic Energy

  • Less solute concentration

  • Lower solute potential

Water movement is observed

  • From high water potential to lower water potential

  • From low solute potential to high solute potential

  • From low pressure potential to high pressure potential

  • From high solute concentration to low solute concentration

Water moves

  • Down a gradient of solutes

  • Down a gradient of free energy

  • Above a gradient of water

  • Above a gradient of pressure

Water potential is not

  • Denoted by Greek symbol psi

  • Expressed in pressure units such as Pascals (Pa)

  • At standard temperature not under any pressure, is taken zero

  • Always negative or zero

For a solution at atmospheric pressure

  • Solute potential is more than water potential

  • Water potential more than solute potential

  • Solute potential is less than water potential

  • Water potential is equal to solute potential

Plants have

  • Positive water potential when cells get turgor pressure

  • Negative water potential when water is transported up a stem

  • Negative pressure is developed in the cell due to turgor pressure

  • Both 1 and 2

Cell wall is

  • Freelly permeable

  • Impermeable

  • Semipermeable

  • Selectively permeable

In plant cell, which of the following is important determinants of movement of molecules in or out of the cell?

  • Cell wall

  • Cell membrane

  • Tonoplast

  • Both 2 and 3

Osmosis

  • Diffusion of water across a differentially permeable membrane

  • Diffusion of water across a semipermeable membrane

  • Diffusion of water across a freely permeable membrane

  • Both 1 and 2

The net direction and rate of osmosis depends upon

  • Pressure gradient

  • Concentration gradient

  • Chemical potential

  • All of these

Apply concept of water potential and osmosis

Solution of which chamber has a lower solute potential?

  • Chamber A

  • Chamber B

  • Both will have equal values

  • Cannot be predicted

Apply concept of water potential and osmosis

In which direction will osmosis occur?

  • From A to B

  • From B to A

  • No net osmosis

  • Cannot be predicted

Apply concept of water potential and osmosis

Which chamber has lower solute potential at equilibrium?

  • Chamber A

  • Chamber B

  • Both will have equal values

  • Cannot be predicted

Apply concept of water potential and osmosis

If B chamber has water potential of -2000 kPa and the A has water potential of -1000kPa, which is the chamber that has the highest Water potential?

  • Chamber A

  • Chamber B

  • Both will have equal values

  • Cannot be predicted

Apply concept of water potential and osmosis

If two solutions, A with water potential 0.2 MPa and B with water potential 0.1 MPa are separated by a selectively permeable membrane, then what will be the direction of movement of water?

  • From A to B

  • From B to A

  • No net osmosis

  • Cannot be predicted

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