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Assertion :- Xylem fibres have highly th...

Assertion :- Xylem fibres have highly thickened walls and continous central lumen.
Reason :- Xylem fibre's wall show lignin deposition and there is no septation and deposition in their lumen face.

A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.

C

If Assertion is True but the Reason is False

D

If both Assertion & Reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
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Explore conceptually related problems

Which xylem element have highly thickned walls and obliterated central lumen?

Match column I with column II and select the correct option from the given codes. {:("Column I","Column II"),(A." Vessels",(i)." CElls are living, with thin cellulosic cells walls"),(B." Tracheids",(ii)." Cells possess highly thickened walls with obliterated central lumen"),(C." Xylem fibres",(iii)." Individual members are interconnected through perforations in their"),(D." Xylem parenchyma",(iv)." Elongated tube-like cells with thick, lignified walls and tapering ends"):}

Assertion : collenchyma is thick walled dead tissue Reason: collenchymatous cells show thickening of pectin

Assertion: Cork or phellem is impervious to water. Reason: Cork has suberin deposition in the cell wall.

Assertion : Atherosclerosis affects the vessels that supply blood to the heart muscle. Reason : It is caused by deposits of calcium, fat, chalesterol and fibrous tissue which makes the lumen of arteries narrower.

Assertion: Red algae contribute in producing coral reef. ltbr. Reason: Some red algae secrete and deposit calcium carbonate our their walls.

Assertion : Sclerenchyma fibres constitute the major mechanical tissue of the plants. Reason : The cells are thick walled and are made up of lignin.

Assertion The collenchyma is a thick-walled living tissue. Reason The collenchyma is thickened due to deposition of pectin.

Assertion (A): Deposition of suberin on the walls makes them impermeable to water. Reason (R): Cell wall is multilayered with usually three layers.

MOTION-ANATOMY OF FLOWERING PLANTS-Excercise - 4 AIIMS | Assertion & Reason Questions
  1. Assertion :-Both tracheids and vessels are devoid of protoplasm. Rea...

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  2. Assertion :-Ontogenically tracheids are unicellular and vessels are mu...

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  3. Assertion :- Xylem fibres have highly thickened walls and continous ce...

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  4. Assertion :- Companion cells are essential for functioning of sieve tu...

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  5. Assertion :-Tissues of plants vary depending on their location in plan...

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  6. Assertion :- Epidermal tissues system is of protective in function. ...

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  7. Assertion :- Epidermal stem hairs are usually of multicellular in natu...

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  8. Assertion :-In roots vascular bundles show radial arrangement of xylem...

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  9. Assertion :- Pericycle of monocot roots show dual functioning. Reaso...

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  10. Assertion :- Both vascular cambium and cork cambium are lateral merist...

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  11. Assertion :- Vascular cambium of dicot stem shows dual origin. Reaso...

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  12. Assertion :- Interfascicular cambium is the dedifferentiated tissue. ...

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  13. Assertion :- Old woody plant parts are devoid of primary phloem. Rea...

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  14. Assertion :- Vascular cambium activity is not uniform throughout the y...

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  15. Assertion :- Annual rings donot provide accurate estimation of age of ...

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  16. Assertion :-Development of cork cambium is the consequence of activity...

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  17. Assertion :- Cork cambium activity is responsible for slough off perip...

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  18. Assertion :- Removal of bark in the form of ring from tree leads to d...

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  19. Assertion :- In roots cork cambium is of secondary origin. Reason :...

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  20. Assertion :- Vascular tissue are complex tissues. Reason :- Xylem ...

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