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प्रश्न
Write a note on the morphological structure of the root.
उत्तर
A typical root of terrestrial plants has four regions from the apex to the base of the root. These are:
- Region of cell division: This is a meristematic region which lies at the tip of the root, where the division of cell occurs.
- Region of cell elongation: Cells of this region undergo elongation, as a result, the length of the root increases.
- Region of absorption: This is the region for water absorption and bears root hairs. Root hairs absorb water and mineral salts from the soil. iv. Region of maturation: Cells of this region undergo maturation and form different types of tissues.
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संबंधित प्रश्न
How is root hair adapted for the absorption of water from the soil?
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.
The alongside diagram A shows a root hair growing through the soil particles. Diagram B is the root hair of an aquatic plant.
(i) Name the parts 1,2,3.
(ii) Name two substances which enter the root hair. What are their uses?
(iii) By what process do these substances enter the root hair?
(iv) Account for the different shapes of root hairs in the two diagrams.
Given below is the diagram of a cell as seen under the microscope after having been placed in a solution:
(i) What is the technical term used for the state/condition of the cell given above?
(ii) Give the technical term for the solution in which the cell was placed.
(iii) Name the parts numbered 1 to 4.
(iv) Is the cell given above a plant cell or an animal cell ? Give two reasons in support of your answer as evident from the diagram.
(v) What would you do to bring this cell back to its original condition?
The diagram given below represents the result of an experiment conducted on two freshly taken shoots of a green herbaceous plant. The lower ends dip in the 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?
Given below is an experimental demonstration.
(i) Which phenomenon has been demonstrated in the given figure?
(ii) What is the solute and what is solvent in the above experiment?
(iii) Define the phenomenon in Q. (i) above.
(iv) Give one example from your daily life experiences based on this principle.
Multiple Choice Question:
Water will be absorbed by the root hairs when:
Outer layer of root hair is made up of ________.
Epiphytic plants like orchids absorb water vapours from air with the help of ______ having special tissue called velamen.
