Home
Class 12
BIOLOGY
Assertion : In angiosperms the conductio...

Assertion : In angiosperms the conduction of water is more efficient because their xylem has vessels.
Reason : Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.

A

if both are true with reason being correct explanation (A),

B

both true but reason is not correct explanation (B),

C

Assertion is ture but reason is wrong (C),

D

both are wrong (D),

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Similar Questions

Explore conceptually related problems

If cohesion tension transpiration theory is correct then a break in water column in xylem vessels

The girdling or ringing experiment to prove that the water moves through the xylem vessels was performed by

A column of water within xylem vessels of tall trees does not break under its weight because of

[A]: The movement of ions from endodermis to xylem elements is an active process. [R]: It requires the involvement of metabolic energy that comes from respiration.

The chief water conducting elements of xylem in gymnosperms are

The ascent of minerals is 1. equal to the rate of translocation of water 2. dependent on transpiration pull 3. through xylem vessel 4. All of the above

[A]: In the hydrophytes the Xylem is not differ- entiated into different types of cells. [R]: Xylem provides support and helps in the conduction of water which is not very impor- tant in hydrophytes

Inner, darker and harder portion of secondary xylem that cannot conduct water, in an older dicot stem, is called

Assertion The increase in internal energy ( DeltaE ) for the vaporisation of one mole of water at 1 atm and 373 Kis zero. Reason For all isothermal processes DeltaE = 0 .

Go through the following statements (i) The cambium is generally more active on the inner side than on the outer. (ii) The autumn wood is darker and has a higher density than spring wood. (iii) In stem, the secondary xylem shows distinction into protoxylem and metaxylem and occurs in the from of patches. (iv) The tracheids and vessels of the sapwood get plugged by the ingrowth of the adjacent parenchyma cells into their cavities called tyloses. Which of theses are correct ? a. (i), (ii) & (iii) b. (i), (ii) & (iv) c. (i) and (ii) d. (i), (iii) & (iv)