Exercises
Dr. K.K. Aggarwal Biology Solutions for Exercises
Simple step-by-step solutions to Exercises questions of Photosynthesis from A New Approach to Biology. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.
Questions from Exercises with Hints & Solutions
In the equation of photosynthesis, the number of molecules of carbon dioxide and water to form 1 molecule of glucose are
Name the process of conversion of several molecules of glucose to one molecule of starch.
Complete the following by filling in the blanks numbered 1 to 10 with the appropriate word/term:
Photosynthesis involves light reaction and dark reaction. During light reaction, the chlorophyll present in the (I) _____ (chloroplasts / mitochondria) gets activated by absorbing light energy. This energy splits (2) _____ (water / oxygen) molecules into (3) _____ (hydrogen ions / sodium ions) and oxygen and releases two electrons. This process is called (4) _____ (photolysis / glycolysis). The (5) _____ (hydrogen / calcium) ions are picked up by NADP to form (6) _____ (NADPH2 / FADH2). The ADP is converted to (7) _____ (ATP / GTP). This process is called (8) _____ (photophosphorylation / gluconeogenesis). During the dark phase, the compound produced at the end of a light reaction reacts with carbon dioxide to from (9) _____(phosphoglyceric acid (PGA) / Glyceraldehyde-3-phosphate). This product is converted to starch. The process is called (10) _____ (carbon fixation / electron transport chain).
Complete the following by filling in the blanks (i) to (v) with the appropriate word:
To test a leaf for starch, the leaf is boiled in water to (i) _____ (destroy enzymes / protect enzymes). It is then boiled in methylated spirit to (ii) _____ (remove chlorophyll / remove carotenoids). The leaf is dipped in warm water to soften it. It is placed in a petri dish, and (iii) _____ (iodine / sodium) solution is added. The region of the leaf which contains starch, turns (iv) _____ (blue-black / yellow-green) and the region which does not contain starch, turns (v) _____ (yellow or remains unchanged / red or purple).
Define photosynthesis.
Define photophosphorylation.
If you are planning an experiment to show the effect of light on photosynthesis:
Will you select white light or green light? Justify your answer.
If you are planning an experiment to show the effect of light on photosynthesis:
Why would you select a destarched plant?
