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Asserion : Long distance flows of photo...

Asserion : Long distance flows of photoassimilates in plants occurs through seive tubes
Reason : Mature seive tubes have parietal cytoplasm and prforated seive plates

A

If both Assertion and Reason are true and Reason is correct explaination of Assertion.

B

If both Assertion and Reason are true but Reason is not correct explanation of Assertion.

C

If Assertion is true but Reason is false.

D

If both Assertion and Reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
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Assertion : long distance flow of phtoassimilates in plants occurs through sieve tubes. Reason: mature seive tubes have parietal cytoplasm

Assertion : Water and mineral uptake by root hairs from the soil occurs through apoplast until it reaches edodermis. Reason : Mature sieve tubes have parietal cytoplasm and perforated sieve plates.

Identify the statements as true(T) or false(F). A. Xylem fibres are the components of xylem in all categories of vascular plants. B. Advanced angiosperm families like Winteraceae & Trochodendraceae do not have vessals. C. Seive tubes & companion cells are ontogenetically related & are called sister cells. D. The cytoplasm of a mature seive tube occurs in the form of a thin-living layer along the inner side of cell walls.

Assertion (A): Seive tubes are made up of sieve plates that help in conduction. Reason (R): Phloem parenchyma gives mechanical support.

$ Seive tubes in plants are formed of enucleated cells called seive members. ! All the activities of a seive cell are controlled by nucleated parenchyma cells.

(i) In the arrangement shown in the figure, the tank has a large cross section and the pipes have much smaller cross section. The opening at A is unplugged and the water jet hits the ground surface at a horizontal distance x. (a) Find the level of water (h) in the tube B as water flows out of A. (b) Find x. (i) A flat horizontal surface has a small hole at its centre . A circular glass plate of radius R is placed symmetrically above the hole with a small gap h remainng between the plate and the surface A liquid enters the gap symmetrically from all sides and after travelling radially through the gap finally exits from the hole. The volume flow rate of the liquid coming out from the hole is Q (in m^(3)s^(-1) ). (a) If the flow speed just inside the circumference of the circular plate is V_(0) and the speed (V_(x)) of flow inside the gap at distance x(see figure) from the centre of the hole. (b) Write V_(x) in terms of Q, h and x.

MODERN PUBLICATION-PHOTOSYNTHESIS IN HIGHER PLANTS-COMPETITION FILE (OBJECTIVE TYPE QUESTIONS )( D.ASSERTION TYPE QUESTIONS ):
  1. Assertion : Photorespiration retards the products of light reaction in...

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  2. Assertion : Action spectrum of Chl.a follow the absorption spectrum in...

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  3. Assertion : The role of phycobilins in photosynthesis is to absorb and...

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  4. Assertion : In photosynthesis oxygen evolved comes from water. Reaso...

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  5. Assertion : Red and blue light support the highest rate of synthesis. ...

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  6. Assertion : Algae float in water during daytime and sink during night ...

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  7. Assertion : The dark reaction in photosynthesis is called because it d...

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  8. Assertion : C4 plants form food more rapidly more efficiently in photo...

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  9. Assertion : In C4 plants end product of CO2 fixation is oxalo-acetic a...

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  10. Assertion : In all C4 plants, photorespiration takes place. Reason:...

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  11. Assertion : Chlorophyll is soluble in ethyl ether and acetone. Reaso...

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  12. Assertion : Etiolated plants are formed due to lack of light. Reason:...

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  13. Assertion : The sequence of dark reaction of photosynthesis was discov...

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  14. Assertion : CO2 is utilized in dark reaction of photosynthesis. Reaso...

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  15. Assertion : The role of chlorophyll in photosynthesis is absorption of...

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  16. Assertion : photosynthetic pathway is more efficient than the C3 path...

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  17. Assertion. The atmospheric concentration of CO(2) at which photosynthe...

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  18. Asserion : Long distance flows of photoassimilates in plants occurs t...

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  19. Assertion (A) Under condition of high light intensity and limited CO(2...

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  20. Assertion: Photosynthetically C(4) plants are less efficient than C(3)...

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