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[A]: Sieve tube members have abundant cy...

[A]: Sieve tube members have abundant cy- toplasm but there is no nucleus.
[R]: The nucleus disint~grates during their development

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Assertion. Sieve tube members have abundant cytoplasm but there is no nucleus. Reason. Nucleus is present in companion cell.

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The acitvity of sieve tubes is remotely controlled by the nucleus of

[A] : One or many nucleoli are present in a nucleus . [R] :The nuclei of polyploids have more nucleoli than those of diploids .

Mature sieve tubes do not have nucleus but they are living and metabolically active . The cell which is associated with sieve tube is :

In this section each item consists of six sentences of a passage. The first and sixth sentences are given in the beginning as S1 and S6. The middle four sentences in each have been jumbled up and labelled P, Q, R and S. You are required to find the proper sequence of the four sentences S1: Systematic and ceaseless efforts are being made to tap scientifically the abundant solar energy available in the country. S6 :Installation of solar thermal systems and devices has helped to save or generate energy to the extent of 350 kWh per annum. P: These include cooking, water heating, water desalination, space heating, etc. Q : A large number of applications in the area have already become commercial. R : Efforts are also afoot to develop economically viable solar collectors for high temperature applications. S : A simple and common mode in solar energy utilization is solar thermal conversion. The proper sequence should be.

TRUEMAN BIOLOGY-Plant Morphology & Reproduction -ASSERTION AND REASON
  1. [A]: The inner most distinict layer of the cortex is called endomermi...

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  2. [A]: Gramineoos type of stomata are found in Gramineae and Cyperaceae....

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  3. [A]: lntercellular spaces are found in mer-isematic cells (R]: The m...

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  4. [A]: Monocot stem has collateral open vascu- lar bundle. [R]: Open ...

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  5. [A]: Root system in hydrophytes is poorly de- veloped. [R]: The con...

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  6. [A]: Aerenchyma is a characteristic of litho- phyte. [R]: It is a sp...

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  7. [A]: Protostele is most simple primitive type of stele. [R]: Accordi...

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  8. [A]: Rubber is obtained from the latex of Hevea brasiliensis. [R]: B...

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  9. [A]: No fibres are found in plants. [R]: Xylem vessels are absent ...

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  10. [A]: Sclerenchyma cells are rarely found in plants. [R]: Sclerencym...

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  11. [A]: Hanstein's dermatogen is not eqyivalent to Haberlandt's Protoderm...

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  12. [A]: Trichomes may occur on all parts of a plant. [R]: Trichomes ei...

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  13. [A]: The vascular cambium is absent in monocots. [R]: The monocots ...

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  14. [A]: In the hydrophytes the Xylem is not differ- entiated into differe...

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  15. [A]: Dicot stem shows secondary growth. [R]: Tissue system is not d...

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  16. given below are assertion and reson. Point out if Assertion . In woo...

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  17. [A]: The inner most distinct layer of the cortex is called endodermis...

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  18. [A]: Sieve tube members have abundant cy- toplasm but there is no nucl...

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  19. Assertion : In collateral vascular bundles phloem is situated toward ...

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  20. [A]: Xylem translocates water and dissolved mineral salts from the roo...

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