Home
Class 12
BIOLOGY
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

early wood

B

late wood

C

heat wood

D

sapwood

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

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.