Absorption by roots - The Processes Involved Biology - Absorption by roots - The Processes Involved

What is responsible for guttation?

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

Active transport is in a direction ________ to that of diffusion.

The pressure by which the ________ Molecules tend to cross the semi-permeable membrane is called osmotic pressure.

When placed in a more concentrated solution, the cell contents will ________ .

Complete the following statements: The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of ________ .

Active transport is one in which the ions outside the roots are ___________.

Loss of water through a cut stem.

The condition in which the cell contents are shrunken

Pressure of the cell contents on the cell wall.

The pressure which is responsible for the movement of water molecules across the cortical cells of the root.

The process by which molecules distribute themselves evenly within the space they occupy.

Study the experimental setup in the figure and then answer the question that follow.

What will you observe in the setup after about half an hour? Give reasons for your answer.

Study the experimental setup in the figure and then answer the question that follow.
What is meant by 'semipermeable membrane'?

Study the experimental setup in the figure and then answer the question that follow.

Explain the phenomenon mention in question 8.1 .

Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and B), the container A having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and somewhat decreased in size. Use the above information to answer the questions that follow: Name and define the physical process being investigated in this experiment.

The diagram below represents a layer of epidermal cells showing a fully grown root hair. Study the diagram and answer the questions that follow:
Mention one distinct difference between the parts labelled A and B.

Show by a series of diagrams, the change which a plant cell will undergo when placed in Hypotonic salt solution

Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypertonic salt solution

Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and B), the container A having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and somewhat decreased in size. Use the above information to answer the questions that follow: Account for the softness and decrease in size of the potato cubes which were placed in sugar solution.

Two potato cubes each 1 cm3 in size, were placed separately in two containers (A&B), the container (A) having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and had somewhat decreased in size. Use the above information to answer the questions that follow: Account for the firmness and increase in the size of the potato cubes placed in water.

A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:

(i) Give the technical terms of the solutions used in beakers, 1, 2 and 3.
(ii) In beaker 3, the size of the potato cube remains the same. Explain the reason in brief.
(iii) Write the specific feature of the cell sap of root hairs which helps in absorption of water.
(iv) What is osmosis?
(v) How does a cell wall and a cell membrane differ in their permeability?

Study the diagram given below and answer the questions that follow :

(a) Name the process being studied in the above experiment.
(b) Explain the process mentioned in (a) above
(c) Why is oil placed over water?
(d) What do we observe with regard to the level of water when this set up is placed in (1) bright sunlight (2) humid conditions (3) windy day?
(e) Mention any three adaptations found in plants to foster the process mentioned in (a) above

What is transpiration pull? How is it caused?

Explain the mechanism of closing and opening of the stomata.

Dry seeds when submerged in water swell up due to endosmosis.

Guttation in plants occurs maximum at mid-day.

If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt.

Soaked seeds burst into three seed coats.

Guttation is another name for bleeding in plants.

Arrange and Rewrite :
Capillary Tubes, Water Movement, Xylem Analogy,  Experiment Setup, Results Analysis

Odd One Out :
(i) Epidermal cell, Cortical cell, Root hair cell, Guard cell
(ii) Imbibition, Root pressure, Osmotic pressure, photosynthesis
(iii) Turgidity, Flaccidity, Plasmolysis, Xylem
(iv) Water absorption, Mineral absorption, Photosynthesis, Ion exchange

Odd One Out :
Diffusion, Imbibition, Osmosis, Oxidation.

Arrange and Rewrite :
Xylem, Soil water, Cortical cells, Root hair.

Arrange and Rewrite :
Facilitated Diffusion, Protein channels open, Diffusion down the concentration gradient,  The substrate binds to the protein, Release of substrate on the other side of the membrane