9. Which is not a function of epidermis *
Protection from adverse condition
Gaseous exchange
Conduction of water
Transpiration
10. The dead element present in the phloem is *
Companion cells
Phloem parenchyma
Phloem fibres
Sieve tubes
11. Which of the following does not lost their nucleus at maturity *
Companion cells
Red blood cells
Sieve tube cells
12. In desert plants rate of water loss gets reduced due to the presence of *
Stomata
Lignin
Cuticle
Suberin
13. A long tree has several branches. The tissue that helps in the sideways conduction of water in the branches is *
Xylem parenchyma
Xylem vessels
Collenchyma
Parenchyma
14. Flexibility in plants is due to *
Parenchyma
Chlorenchyma
Collenchyma
Sclerenchyma
15. Cork cells are made impervious to water and gases by the presence of *
Lignin
Suberin
Cellulose
None
16. The water conducting tissue generally present in gymnosperm is *
Tracheids
Vessel
Sieve tube
Xylem fibres
Answers
Answer:
9.Conduction of water and minerals in plants takes place in conducting vessels, located in the core, called xylem. Thus conduction of water is not the function of the epidermis but, xylem.
10.(b) Phloem fibres are thick walled, elongated spindle shaped dead cells which possess narrow lumen. They provides mechanical support to the tissue. Phloem parenchyma are thin walled-living cells of parenchyma. They have two functions, storage and lateral food conduction.
11.Sieve tube cells lose the nucleus and many cell organelles at maturity. Therefore, they depend upon companion cells for their metabolic needs. Companion cells do not lose the nucleus at maturity. Therefore, option A is correct.
12.It minimises the water loss through transpiration (with the help of stomata) and also reduces pathogen entry. Lignin hardens the cell wall and provides flexcibilty, tensile and compressional strength to the cell wall. Suberin is present in cork cells and makes the cell impervious to water.
13.It is composed of xylem tracheids, vessels, fibres, and parenchyma. Xylem parenchyma helps in sideways conduction. Xylem vessels and tracheids are responsible for vertical conduction of water. So, the correct answer is option B.
14.Plants are flexible due to the presence of collenchyma. Collenchyma tissue is present in leaf stalk below the epidermis and provides mechanical support to the plant.
15.It provides flexibility, great tensile and compression strength to the cell wall and makes the eel; wail impermeable. It is present in scierenchyma cells and not in cork cells. The walls of cork cells are heavily thickened with an organic substance, suberin, Suberin makes these cells impervious to water and gases
16.
Explanation:
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