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In temperate regions, cambium is less ac...

In temperate regions, cambium is less active during winter season and forms fewer xylary elemetns that have narrow vessels, this wood is called as

A

spring wood

B

automn wood

C

heartwood

D

sapwood.

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The correct Answer is:
B
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In temperate regions, during spring season, cambium is very active and produces a large number of xylary elements having vessel with wider cavities wood formed in this way is called as

Read the following statements. A. All tissue on the inner side of the endodermis constitute the stele. B. Peripheral vascular bundles are generally larger than the centrally located ones in monocot stems. C. In late wood, cambium produces a large number of xylary elements having vessels with wider cavities. D. The cork is impervious to water due to suberin deposition in the cell membrane. How many of the above statements are incorrect?

The wood formed during spring season is called :

State true(T) or false(F) to the given statements and select the correct option. ( a ) Annual rings are distinct in plants growing in temperate regions. ( b ) Lenticels occur in most woody trees and permit the exchange of gases. ( c ) Due to stelar secondary growth, central cylinder of wood surrounded by secondary phloem is formed. ( d ) The cells of endodermis opposite to protoxylem divide to give rise vascular cambium in dicot roots.

Go through the following statements (i) The cambium is generally more acitve on the inner side than on the outer. (ii) The autunn 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 form of patches. (iv) The tracheids and vessels of the sapwood get plugged by the ingrowth of the adjacent parenchyma cells into thier cavities called tyloses. Which of theses are correct ?

What is so special about tropics that might account for their greater biological diversity? a. Unlike temperate regions subjected to frequent glaciations in the past, tropical latitudes have remained relatively undisturbed for millions of years and thus, had a long evolutionary time for species diversification. b. Temperate environments, unlike tropical ones, are less seasonal, relatively more constant and predictable. Such constant environments promote niche specialization and lead to a greater species diversity. c. There is more solar energy available in the tropics, which contributes to higher productivity, this in turn might contribute indirectly to greater diversity.

NCERT FINGERTIPS ENGLISH-ANATOMY OF FLOWERING PLANTS-Anatomy Of Flowering Plants
  1. Identify P,QltRltS and T in the given T.S. of dicot stem showing secon...

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  2. As comprared to spring wood, automn wood has

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  3. In temperate regions, cambium is less active during winter season and ...

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  4. In temperate regions, during spring season, cambium is very active and...

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  5. Read the following statements and select the correct option Statemen...

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  6. In old trees, central dark coloured, non-conducting part of secondary ...

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  7. Which of the following statements are correct about heartwood? (i). ...

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  8. Study carefully the following statements and select the incorrect one(...

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  9. Match column I with column II and select the correct option from the g...

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  10. The terms 'wood' and 'bast' respectively refer to

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  11. Which of the following options carrectly shows the sequence of differe...

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  12. Phellogen cuts off derivatives on the inner side to form and on the ou...

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  13. Cork is impervious to water due to the presence of in its cell wall.

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  14. Bark does not include

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  15. The collective term used for phelloderm (secondary cortex), cork cambi...

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  16. Bark dormed early in the season is called as bark and bark formed towa...

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  17. Match column I with column II and select the correct option from the g...

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  18. During secondary growth in a dicot root, cork cambium is formed by the...

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  19. Bark of which of the following plants yields a drug for the treatment ...

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  20. Match column I with column II and select the correct option from the g...

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