Q3. ANSWER THE FOLLOWING QUESTIONS (2 + 3 = 5)
a) What is reticulate venation and parallel venation?
b) How will you test the presence of starch in a food?
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1. Reticulate Venation. Meaning. When veins (or the nerves) are arranged parallel to one another all over the leaf blade or lamina is called as parallel venation. When veins (or the nerves) shows network or web-like arrangement all over the leaf blade or lamina, it is called as reticulate venation.
2. Take small quantity of the food items to be tested. Put 2-3 drops of iodine solution on it. Observe the colour of the food item. Blue-black colour indicates the presence of starch in the tested food item.
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