In an experiment a part of a leaf is inserted in a test tube containing some KOH soaked cotton, while the other half is exposed to air. The setup is then placed in light for some time. On testing for the presence of starch later in the two parts of the leaf-

Mention the two chemicals which you have used in an experiment to test the presence of starch in the leaf.

In the half leaf experiment the part of leaf showed positive for starch test.

In a experiment on two leaves - a variegated leaf or a leaf that was partially covered with black paper, and one that was exposed to light. Testing these leaves for what so that it becomes clear that photosynthesis occurred only in the green parts of the leaves in the presence of light.

One test tube contains some acid and another test tube contains an equal quantity of water. To prepare a solution, 20 grams of the acid is poured into the second test tube. Then, two-thirds of the so-formed solution is poured from the second tube into the first. If the fluid in first test tube is four times that in the second, what quantity of water was taken initially? (a) 40 grams (b) 60 grams (c) 80 grams (d) 100 grams

Apparatus: Two test tubes, bent tube, rubber cork, burner, etc. Chemicals: Calcium carbonate, freshly prepared lime water. Procedure: Take some calcium carbonate in a test tube. Fit a bent tube to this test tube with the help of a rubber cork. Insert the other end of the bent tube in the freshly prepared lime water taken in the other test tube. Heat the powdered calcium carbonate in the first test tube strongly. What will you observe?

The Figure shown below represents an activity to prove the requirements for photosynthesis. During this activity, two healthy potted plants were kept in the dark for 72 hours. After 72 hours, KOH is kept in the watch glass in setup X and not in setup Y. Both these setups are air tight and have been kept in light for 6 hours. Then, Iodine Test is performed with one leaf from each of the two plants X and Y. The function of KOH is to absorb