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[A]: The vascular cambium is absent in m...

[A]: The vascular cambium is absent in monocots.
[R]: The monocots never show secondary growth

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

Text Solution

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The correct Answer is:
A
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An example of monocots showing secondary growth in stem is

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Go through the following statements (i) Phloem parenchya is absent in most of the monocot (ii) Phloem fibres store food material and other substance like resins, latex and mucilage (iii) Phloem fibre are generally absent in the primary phloem but are found in the secndary phloem (iv) Gymnosperms lack sieve tubes and albuminous cells. Which of these are correct ?

[A]: The secondary pholem consititutes a less poriment part of the tree trunk than the secondry xylem [R] : The amount of Phloem produced by the cambium is smaller than that of seconday

Read the following four statements (A-D) (A) Both, photophosphorylation and oxidative phoshorylation involve up hill transport of protons across the membrane (B) In dicot stems, a new cambium originates from the cell of pericycle at the time of secondary growth (C ) Stamens in flowers of Gloriosa and Petunia are polyandrous (D)Symbiotic nitrogen-fixers occur in the free-living state also in soil How many of the above statements are right

Why is vascular bundle of monocot stem called closed vascular bundle ?

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What is the fate of primary xylem in a dicot root showing extensive secondary growth?

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]: Gramineous type of stomata are found in Gramineae and Cyperaceae....

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  3. [A]: lntercellular spaces are found in meristematic 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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