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प्रश्न
The below figure shows a root hair:
(i) Label the parts 1 to 4.
(ii) What is the role of part 4?
(iii) Why is the root hair one-celled?
(iv) What will happen to the root hair if some fertilizer is added to the soil near the root hair?
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उत्तर
(i) 1. Nucleus
2. Vacuole
3. Cell wall
4. Cell membrane
(ii) Part 4 is the cell membrane. It is semi-permeable. It allows only water molecules to pass through it.
(iii) Because it is an extension of epiblema cell.
(iv) By the addition of fertilizer, root hair becomes flaccid, because water will move out of it as soil water becomes hypertonic.
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संबंधित प्रश्न
Which one of the following is a characteristic NOT related with the suitability of the roots for absorbing water?
Root hairs become flaccid, when fertilizers are added to the moist soil around it. Explain.
A few RBC’s were kept in three test tubes containing isotonic, hypotonic and hypertonic solutions. What will be the expected observations after a few hours? Explain.
Name the following:
The kind of cells that constitute the cortex of a root.
Most plant cells and tissues constitutes _____ % water.
What is the composition of an outer layer of root hair?
Epiphytic plants like orchids absorb water vapours from air with the help of epiphytic roots having special tissue called ____________.
How many regions are there in a typical root?
How many regions are there in a typical root?
Why and how does water enter continuously into the root xylem?
