Tag: plant water relation

Quizzes (6) Questions (146)

Questions Related to plant water relation

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

The process of diffusion is involved in _____________.

  1. Respiration

  2. Photosynthesis

  3. Transpiration

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

Diffusion keeps the cell walls of the internal plant tissues moist. It is a means of spreading of ions and other substances throughout the protoplast. Transpiration or loss of water in vapour forms is a diffusion process. Exchange of gases (CO2(CO2 and O2)O2) during photosynthesis and respiration between the plant interior and outside air also occurs through diffusion.

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

A plant cell was put into a solution of substance A at a concentration of $200\ mmol/L$. The rate of uptake into the cell was measured as $5\ mmol/minute$. When the cell was placed in a solution of substance A at a concentration of $400\ mmol/L$, the rate of uptake was $10\ mmol\ per\ minute$. When the experiment was repeated with substance B, the rate of uptake was $10\ mmol\ per\ minute$ at both concentrations of the substance. Which of the following provides the best explanation of the results?

  1. Substance A appears to move into the cell by active transport, and B by diffusion

  2. Substance A and B appear to move into the cell by passive transport

  3. Substance A and B appear to move into the cell by active transport

  4. Substance A appears to move into the cell by diffusion and substance B by active transport
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In the active transport, as the concentration of the solution increases, so does the amount of uptake in a cell. And in diffusion, the amount of the uptake of a substance in a cell is usually not affected by the concentration of the solution.

So, the correct answer is 'Substance A appears to move into the cell by active transport and B by diffusion'.
Multiple choice botany plant water relation active transport and passive transport types of plant transport atp

Which of the following is zero in fully turgid cell?

  1. DPD and ${ \Psi } _{ P }$
  2. DPD and ${ \Psi } _{ W }$
  3. OP and ${ \Psi } _{ W }$
  4. TP and ${ \Psi } _{ P }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DPD is the difference in the diffusion pressure of the solution and a pure solvent when both are subjected to the same atmospheric pressure. When the increasing turgor pressure becomes equal to the decreasing osmotic pressure, the entry of the water into the cell would stop. This is called the turgid condition of the cell. This is when DPD equals zero.

Pressure potential is the positive pressure developed in the system due to the osmotic entry of water into it. It is negative in plasmolysed cell and xylem vessel and zero for the turgid cell.
Hence, the correct answer is 'DPD and ${ \Psi } _{ P }$'

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

Choose the correct answers from the alternatives given.
In a fully turgid cell, which one of the following would be zero?

  1. Suction pressure

  2. Osmotic pressure

  3. Wall pressure

  4. Turgor pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Suction pressure or the DPD is given as the difference of osmotic pressure and the turgor pressure, $DPD = OP - TP$

In a fully turgid cell, the entry of water into the cell causes the development of the turgor pressure, therefore, TP cannot be zero. When the increasing turgor pressure becomes equal to the decreasing osmotic pressure, the entry of water into the cell would stop. This means DPD becomes zero in a fully turgid condition.
Hence, the correct answer is 'Suction pressure'.