0

Absorption by Roots

Description: 20
Number of Questions: 15
Created by:
Tags: 20 Cell - Structure and Functions
Attempted 0/15 Correct 0 Score 0

Seeds when soaked in water imbibe due to _________________.

  1. low osmotic pressure inside the seed

  2. seed coat containing lot of salts

  3. the working of the process of absorption

  4. many vacuoles in the endosperm

  5. none of these


Correct Option: C
Explanation:

Seeds when soaked in water imbibe because the process of absorption works.

The process of endosmosis stops

  1. when concentration becomes equal

  2. when solution becomes isotonic

  3. when the leaves fall

  4. when there is no light

  5. in the presence of chlorophyll


Correct Option: B
Explanation:

The process of endosmosis stops when solution becomes isotonic.

Which of the following will be zero, when the cell is fully turgid?

  1. Osmotic pressure

  2. Turgor pressure

  3. Wall pressure

  4. Internal pressure

  5. Suction pressure or diffusion pressure deficit


Correct Option: E
Explanation:

When the cell is fully turgid, suction pressure or diffusion pressure deficit will be zero.

In the process of osmosis in a cell __________.

  1. both protoplasm and cell wall act as a membrane

  2. only cell wall act as membrane

  3. only outermost layer of protoplast acts as a membrane

  4. the entire protoplast acts as a membrane

  5. some parts of protoplast act as a membrane


Correct Option: D
Explanation:

In the process of osmosis in a cell, the entire protoplast acts as a membrane.

When a plant wilts, the sequence of events will be

  1. exosmosis, plasmolysis, deplasmolysis, temporary wilting and permanent wilting

  2. plasmolysis, deplasmolysis, temporary wilting and permanent wilting

  3. exosmosis, plasmolysis, deplasmolysis and temporary wilting

  4. exosmosis, plasmolysis, temporary wilting and permanent wilting

  5. deplasmolysis, temporary wilting, exosmosis and plasmolysis


Correct Option: D
Explanation:

When a plant wilts, the sequence of events will be: exosmosis, plasmolysis, temporary wilting and finally permanent wilting.

Marine fish when thrown under tap water bursts because of

  1. diffusion

  2. exosmosis

  3. endosmosis

  4. plasmolysis

  5. deplasmolysis


Correct Option: C
Explanation:

The movement of water molecules takes place from outside to inside due to endosmosis and hence, marine fish when thrown under tap water bursts.

The space between the cell wall and the plasma membrane in a plasmolysed cell is filled with

  1. isotonic solution

  2. hypertonic solution

  3. hypotonic solution

  4. water

  5. cytoplasm


Correct Option: A
Explanation:

The space between the cell wall and the plasma membrane in a plasmolysed cell is filled with isotonic solution.

Wilting and drooping of leaves is due to loss of ____________.

  1. water

  2. root pressure

  3. salts

  4. turgidity

  5. sap


Correct Option: D
Explanation:

Wilting and drooping of leaves is due to loss of turgidity.

When there is no movement of water in the cell from the outside ________, it is considered to be _________ to cell sap.

  1. isotonic, medium

  2. medium, isotonic

  3. medium, hypotonic

  4. medium, hypertonic

  5. hypotonic, medium


Correct Option: B
Explanation:

When there is no movement of water in the cell from the outside medium, it is considered to be isotonic to cell sap.

Condition of cell in which the contents are shrunken is

  1. osmosis

  2. endosmosis

  3. deplasmolysed

  4. plasmolysed

  5. exosmosis


Correct Option: D
Explanation:

Condition of cell in which the contents are shrunken is plasmolysed.

______________ serves as a medium for the transport of ______________ and food molecules in the plant.

  1. Solute, water

  2. Water, solute

  3. Inorganic salts, water

  4. Water, inorganic salts

  5. Inorganic salts, solute


Correct Option: D
Explanation:

Water serves as a medium for the transport of inorganic salts and food molecules in the plant.

Plasma membrane controls____________.

  1. passage of water only

  2. passage of water and solutes in and out of the cell

  3. passage of water and solutes into the cell

  4. movement of cell contents out of the cell

  5. passage of gases in and out of the cell


Correct Option: B
Explanation:

Plasma membrane controls passage of water and solutes in and out of the cell.

Water will be absorbed by the root hairs when

  1. the plant is rapidly respiring

  2. the concentration of solutes in the cell sap is high

  3. the concentration of solutes in the soil is high

  4. the concentration of solutes in the cell sap is low

  5. the concentration of solutes in the soil is isotonic


Correct Option: B
Explanation:

Water will be absorbed by the root hairs when the concentration of solutes in the cell sap is high due to the process of endosmosis.

Osmosis involves diffusion of

  1. suspended particles from the region of lower concentration to higher concentration

  2. water from the more concentrated solution to the less concentrated solution

  3. molecules or ions from the less concentrated solution to the more concentrated solution

  4. suspended particles from the region of higher concentration to lower concentration

  5. molecules or ions from the more concentrated solution to the less concentrated solution


Correct Option: E
Explanation:

Osmosis involves diffusion of molecules or ions from the more concentrated solution to the less concentrated solution.

Osmosis is the diffusion of _____________ molecules from the region of higher ___________ potential to the region of lower __________ potential.

  1. solution, solution, water

  2. water, solution, solution

  3. water, water, water

  4. solution, solution, water

  5. water, solution, water


Correct Option: C
Explanation:

Osmosis is the diffusion of water molecules from the region of higher water potential to the region of lower water potential.

- Hide questions