STRUCTURAL ORGANISTION OF PLANTS AND ANIMALS
ANATOMY OF FLOWERING PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Wood is lighter and has higher density
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Xylary elements have wide cavity
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Ring of autumn wood alternates with spring wood to form annual ring
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Cambium is highly active during autumn
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Detailed explanation-1: -The early wood and the late wood occur appears in the form of concentric rings known as the annual rings. Autumn wood is not differentiated from spring wood in colour of xylem and cambium. Thus, option B is correct.
Detailed explanation-2: -Late wood or autumn wood is formed during winter season. It is formed after the early wood. It consists of xylem elements with narrow vessels. They are produced less in amount, more dense.
Detailed explanation-3: -The autumn wood is also called as late wood and under unfavorable conditions, a lower quantity of secondary xylem is developed in these trees. These trees comprise smaller, thick-walled and narrower tracheary constituents. Note:The wood density of spring wood is lower as compared to that of the autumn wood.
Detailed explanation-4: -The springwood is lighter in color and has a lower density. Autumn wood is darker in color and has higher density. The transition from springwood to autumn wood is slow. The transition from an autumn wood to springwood is fast.
Detailed explanation-5: -The vessels have narrow lumen as less water is needed in the season. The wood formed during this season is called the springwood or earlywood. The wood formed in this season is called autumn wood or latewood.