Absorption by Roots Biology - Absorption by Roots

Process of ascent of sap in plants occurs ___________

Wilting of plants occurs when ____________

Exudation or bleeding is associated with ___________

The water is translocated upwards from the roots through _____________

In ascent of sap water reaches upwards ____________

Name the process by which molecules distribute themselves evenly within the space they occupy ______ 

What will happen if a concentrated solution of a fertilizer is given to the potted plants?

Why do plants die when salt is sprinkled over them?

Define ascent of sap.

Explain why:
The leaves of wilted lettuce, if kept in cold water, become crisp.

Explain why:
We gargle with saline solution in case of throat infection.

Three plants (a), (b) and (c) were placed in beakers containing coloured water. The water in each beaker was covered with a layer of oil. The leaves were removed from plant (b), while plant (c) was exposed to strong light.
(i) In which plant, (a), (b) or (c) would the water move up the fastest?
(ii) In which plant (a), (b) or (c), would the water move up slowly?
(iii) Why was the water covered with a layer of oil?
(iv) What is being investigated by this experiment?

Give at least three uses of water to green plants.

Explain why:
Bacteria and fungi do not grow in pickles, jams, jellies and squashes.

The diagram given below represents a plant cell after being placed in a strong sugar solution. Guidelines 1 to 5 indicate the following:
1. Strong sugar solution
2. Cell wall
3. Protoplasm
4. Large vacuole
5. Nucleus
Study the diagram and answer the questions that follow:
(i) What is the state of the cell shown in the diagram?
(ii) Name the structure which acts as a selectively permeable membrane.
(iii) If the cell had been placed in distilled water instead of strong sugar solution which feature would not have been present?
(iv) If the cell in the diagram possessed chloroplasts where would these be present?
(v) Name any one feature of this plant cell which is not present in animal cells.

Explain briefly whydo not root hairs become flaccid when fertilisers are added to the moist soil around them?

The diagram given below represents the results of an experiment conducted on two freshly taken leafy shoots of a herbaceous plant. The lower ends of the shoots dip in ordinary water.
(i) What is the aim of the experiment?
(ii) Some parts of the stem in both the shoots have been removed. Name the conducting tissue in shoot (a) and in shoot (b) that has been removed.
(iii) What are the results of this experiment?

The figure shows a diagrammatic representation of the movement of certain substances inside the stem of a certain plant. Write five sentences on whatever you can explain about the processes or the arrangement of structures indicated in the diagram.
Note: - Each sentence must include one or more of the following four words, and each word can be used several times. Xylem, phloem, roots, leaves.

The apparatus arranged alongside signifies an important process.
(i) Name the process.
(ii) Where does this process occur in plants?
(iii) What solution is placed inside the dialysis tubing?
(iv) What happens to the level of the solution in the capillary tube?

Define root pressure. How would you demonstrate it experimentally?

Distinguish between the following:
Osmosis and diffusion

What part is played by the cell wall?

How is root hair adapted for the absorption of water from the soil?