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A plant biochemist received a spicemen f...

A plant biochemist received a spicemen from a fellow scientist who noticed that the plant's stomata are closed during the day. The biochemist observed that radioactive carbon supplied in the form of carbon dioxide fed to the plant at night, was first found in organic acids that accumulated in the vacuole.During the day, the label moved to sugars being manufactured in the chloroplast. What was the conclusion of the biochemist?

A

It is a CAM plant

B

It is a C4 plant

C

It is a C3 plant

D

It is a plant showing pentose phosphate pathway

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The correct Answer is:
A
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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:

TRUEMAN BIOLOGY-PHOTOSYNTHESIS IN HIGHER PLANTS-MULTIPLE CHOICE QUESTIONS
  1. Consider the following statement: A.The layer of bundle sheath cells...

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  2. Find out the wrong statement

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  3. A plant biochemist received a spicemen from a fellow scientist who not...

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  4. The C(2) glycolate cycle is also known as

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  5. Carotenoids are

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  6. Consider the following statement: - 1. PEP carboxylase has a high spe...

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  7. Consider the following statements A. The chloroplast pigments are fa...

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  8. Which of the following statements is true for photosynthesis?

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  9. Which of the following is a true?

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  10. Which of the following is false statement?

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  11. Select the correct statement for photosynthesis

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  12. Select the wrong statement

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  13. Cyclic photophosphorylation results in the formation of

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  14. Palisade parenchyma is absent in leaves of

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  15. Chemiosmosis was first described by

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  16. The mapping of the pahtway of carbon assimilation in photosythesis ear...

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  17. In Photosytem-I (PSI) of light reaction which substrate works as an el...

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  18. Read the following four statement A,B,C and D and select the right opi...

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  19. Go through the following figure and find out the option which reflects...

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  20. Kranz anatomy is one of the characteristics of the leaves of

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