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प्रश्न
They are pipe-like, consisting of a group of specialised cells. They transport substances and form two-way traffic in plants. Which of the following terms qualify for the features mentioned above?
पर्याय
Xylem tissue
Vascular tissue
Root hairs
Phloem tissue
उत्तर
Phloem tissue
Explanation:
Phloem tissue consists of a group of specialised cells. Sieve tubes are elongated tubular conducting channels of phloem through which food is transported. The contents of the phloem can move in the upward as well as in the downward direction. Therefore, they form two-way traffic in plants.
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संबंधित प्रश्न
Match the items in column I with those in column II
| Column I | Column II | ||
| (a) | Xylem | (i) | semi - permeable |
| (b) | Phloem | (ii) | permeable |
| (c) | Cell membrane | (iii) | downward flow of sap |
| (d) | Root pressure | (iv) | upward flow of water |
| (e) | Cell wall | (v) | guttation |
Study the diagram given below and answer the questions that follow:
- Name the process being studied in the above experiment.
- Explain the process mentioned in (a) above
- Why is oil placed over water?
- What do we observe with regard to the level of water when this set-up is placed in (1) bright sunlight, (2) humid conditions and (3) windy days?
- Mention any three adaptations found in plants to foster the process mentioned in (a) above
Explain why:
Raisins swell up in water.
Choose the correct answer:
An example of a selective permeable membrane is __________
Choose the correct answer:
Which one is semi-permeable?
Choose the correct answer:
Meaning of ascent of sap is ____________
Choose the correct answer:
Wilting of plants occurs when ____________
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?
Give Technical Term for the following.
Phenomenon of absorption of water by surface attraction.
What is the composition of inner layer of root hair?
