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During secondarry growth , at same place...

During secondarry growth , at same places ,the cambium forms narrow band of parenchyma, which passes through the secondary xylem and the secondary phloem in the radial directions. These are called

A

Medullary rays

B

Phelloderm

C

Secondary medullary rays

D

Fascicular cambium

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The correct Answer is:
C

During secondary growth at some places the camsbium forms narrow band of parenchyma, which passses though the secondary xylem and the secondary phloem in the radial irection. These are called secodary medullary rarys
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At some places, the cambium forms a narrow bands of (A)____ which passes throught he secondary xylem and the secondary phloem in the radial directions. These are the (B)_____

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What happens to primary xylem and primary phloem during secondary growth?

Read the passage given below and answer the following questions: Reductive alkylation is the term applied to the process of introducing alkyl groups into ammonia or a primary or secondary amine by means of an aldehyde or ketone in the presence of a reducing agent. The present discussion is limited to those reductive alkylations in which the reducing agent is hydrogen and a catalyst or "nascent" hydrogen, usually from a metalacid combination, most of these reductive alkylations have been carried out with hydrogen and a catalyst. The principal variation excluded is that in which the reducing agent is formic acid or one of its derivatives, this modification is known as the Leuckart reaction. The process of reductive alkylation of ammonia consists in the addition of ammonia to a carbonyl compound and reduction of the addition compound or its dehydration product. The reaction usually is carried out in ethanol solution when the reduction is to be effected catalytically Since the primary amine is formed in the presence of the aldehyde it may react in the same way as ammonia, yielding an addition compound, a Schiff's base (RCH= NCH_(2)R) and finally, a secondary amine. Similarly, the primary amine may react with the imine, forming an addition product which also is reduced to a secondary amine Finally, the secondary amine may react with either the aldehyde or the imine to give products which are reduced to tertiary amines. Similar reactions may occur when the carbonyl compound employed is a ketone. (source: Emerson, W. S. (2011). The Preparation of Amines by Reductive Alkylation. Organic Reactions, 174–255. doi:10.1002/0471264180.or004.03 ) Acetaldehyde is reacted with ammonia followed by reduction in presence of hydrogen as a catalyst. The primary amine so formed further reacts with acetaldehyde. The Schiff’s base formed during the reaction is:

Read the passage given below and answer the following questions: Reductive alkylation is the term applied to the process of introducing alkyl groups into ammonia or a primary or secondary amine by means of an aldehyde or ketone in the presence of a reducing agent. The present discussion is limited to those reductive alkylations in which the reducing agent is hydrogen and a catalyst or "nascent" hydrogen, usually from a metalacid combination, most of these reductive alkylations have been carried out with hydrogen and a catalyst. The principal variation excluded is that in which the reducing agent is formic acid or one of its derivatives, this modification is known as the Leuckart reaction. The process of reductive alkylation of ammonia consists in the addition of ammonia to a carbonyl compound and reduction of the addition compound or its dehydration product. The reaction usually is carried out in ethanol solution when the reduction is to be effected catalytically Since the primary amine is formed in the presence of the aldehyde it may react in the same way as ammonia, yielding an addition compound, a Schiff's base (RCH= NCH_(2)R) and finally, a secondary amine. Similarly, the primary amine may react with the imine, forming an addition product which also is reduced to a secondary amine Finally, the secondary amine may react with either the aldehyde or the imine to give products which are reduced to tertiary amines. Similar reactions may occur when the carbonyl compound employed is a ketone. (source: Emerson, W. S. (2011). The Preparation of Amines by Reductive Alkylation. Organic Reactions, 174–255. doi:10.1002/0471264180.or004.03 ) The reaction of ammonia and its derivatives with aldehydes is called:

Assertion: Secondary growth usually occurs in dicotyledonous stems. Reason: The vascular cambium present between xylem and phloem possesses the ability to form secondary xylem and secondary phloem respectively.

During the secondary growth in a dicotyledonous stem, the fusiform initials of vascular cambium give rise to which of the given labelled part?

Assertion: During secondry growth, the amount of secondary xylem produced is more than secondaryt phloem and soon forms a compact mass. Reason: The vascular cambium (cambial ring) is generally more active on the inner side than on the outer side

A2Z-ANATOMY OF FLOWERING PLANTS-Section A : Topicwise Questions Topic 6 : Secondary Growth (vascular Cambium , Cork Cambium And Seco
  1. The function of cork cambium (phellogen) is to produce

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  2. Recoginise the figure and find out the correct matching

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  3. During secondarry growth , at same places ,the cambium forms narrow ba...

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  4. Which of the following statements are correct about heartwood? (a). ...

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  5. The activity of cambium is under the control of -

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  6. which is not part of periderm

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  7. Match the columns I II and III and choose the correct combination from...

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  8. The climatic conditons are not uniform through the year in

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  9. Recognise the figure and find out the correct matiching

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  10. Cambium is a lateral meristem that takes part in

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  11. Fill in the blanks: In older trees , the greater part of …a…. Is dar...

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  12. cellular layers form outside to inside in old dicot stem are

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  13. The peripheral region of the secondary xylem is lighter in colour and ...

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  14. older resin-clogged central seconedary xylem and younger outer seconda...

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  15. Recognise the figure and find out the correct matiching

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  16. Read the following statements and find out the incorrect statement

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  17. vascular cambium of stem is

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  18. Which of the following statement is / are not true A. Cork cambium i...

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  19. Recognise the figure and find oput the correct matching

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  20. Cambium ring in dicot stem consist of

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