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प्रश्न
In Gymnosperms, the activity of sieve cells are controlled by ______.
पर्याय
Nearby sieve tube members.
Phloem parenchyma cells.
Nucleus of companion cells.
Nucleus of albuminous cells.
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उत्तर
In Gymnosperms, the activity of sieve cells are controlled by Nucleus of albuminous cells.
संबंधित प्रश्न
Explain the structure of stomata with a labelled diagram.
Grafting is successful in dicots but not in monocots because the dicots have ______.
Specialised epidermal cells surrounding the guard cells are called
Cuticle is secreted from
Trichomes are ______.
Match the following and choose the correct option from below
| Column I | Column II |
| A. Cuticle | i. Guard cells |
| B. Bulliform cells | ii. Single layer |
| C. Stomata | iii. Waxy layer |
| D. Epidermis | iv. Empty colourless cell |
Identify the simple tissue system from the following.
What is present on the surface of the leaves which helps the plant prevent loss of water but is absent in roots?
Below is a list of plant fibres. From which part of the plant these are obtained
Cotton
Epidermal cells are often modified to perform specialized functions in plants. Name some of them and the function they perform.
Plants require water for their survival. But when watered excessively, plants die. Discuss.
The stomatal pore is guarded by two kidney shaped guard cells. Name the epidermal cells surrounding the guard cells. How does a guard cell differ from an epidermal cell? Use a diagram to illustrate your answer.
Distinguish between the following:
Stem hair and root hair
What is the stomatal apparatus?
In the given figure, which component has thin outer walls and highly thickened inner walls?
Identify the correct statements:
- Lenticels are the lens-shaped openings permitting the exchange of gases.
- Bark formed early in the season is called hard bark.
- Bark is a technical term that refers to all tissues exterior to vascular cambium.
- Bark refers to periderm and secondary phloem.
- Phellogen is single-layered in thickness.
Choose the correct answer from the options given below:
