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A cut trunk shows 26 concentric rings of...

A cut trunk shows 26 concentric rings of spring wood and autum wood in alternate rows. The age of trunk would be

A

13 years

B

26 years

C

52 years

D

104 years

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The correct Answer is:
A
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A 50 years old tree with distinct annual rings in its trunk will show: 1. 50 annual rings from base of trunk to apex 2. 50 rings at bae of trunk and about 20 rings at apex. 3. 50 rings at is base of trunk and uniformly decreasing towards apex 4. 50 rings at bae of trunk and more or irregular number of rings at apex.

In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants systhesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. A piece of wood from an archeological source shows a C-14 activity which is 60% of the activity found in fresh wood today. The age of archeological sample will be:

A tree shows spirally arranged deep constrictions on its trunk. The same would be due to

Go through the following statements (i) The cambium is generally more active on the inner side than on the outer. (ii) The autumn 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 from of patches. (iv) The tracheids and vessels of the sapwood get plugged by the ingrowth of the adjacent parenchyma cells into their cavities called tyloses. Which of theses are correct ? a. (i), (ii) & (iii) b. (i), (ii) & (iv) c. (i) and (ii) d. (i), (iii) & (iv)

TRUEMAN BIOLOGY-ANATOMY OF FLOWERING PLANTS -MULTIPLE CHOICE QUESTIONS
  1. The commercial jute fibres are obtained from

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  2. A common character of monocot and dicot roots is

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  3. A cut trunk shows 26 concentric rings of spring wood and autum wood in...

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  4. Casparian strips are present in the of the root

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  5. Vascular bundle having phloem at the centre encircled by xylem is know...

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  6. Go through the following diagram carefully which of the following repr...

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  7. Lenticels are involved in

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  8. Interfascicular cambium develops from the cells of

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  9. Age of tree can be estimated by

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  10. Tracheids differ from other tracheary elements in

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  11. you are given a fairly old piece of dicot stem and a dicot root. Which...

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  12. A major characteristic of the monocot root is the presence of

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  13. Vascular bundles in monocotyledons are considered closed because :

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  14. Read the different components from (A) to (D) in the list given below ...

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  15. Specialised epidermal cells surrounding the guards cells are called

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  16. Cortex is the region found between

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  17. the balloon- shaped structuces called tyloses

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  18. Indentify the wrong statement in context of heartwood

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  19. Root hairs develop from the region of

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  20. Which of the following is made up of dead cells

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