Question

(c)Why was no starch found in:(i)the part of the leaf labelled A......................................................................................................................................................................................................................................................(1)(ii)the part of the leaf labelled B?......................................................................................................................................................................................................................................................(1)(Total 7 marks)Q3.A plant with variegated (two-coloured) leaves was left in sunlight for several hours. Pieces of one of its leaves were then detached (removed) and tested for sugar. The diagram below shows the results.Explain, as fully as you can, why the yellow region of the leaf had not produced sugar

Answer 1

During photosynthesis a plant absorbs light energy using the pigment chlorophyll. This allows it to convert carbon dioxide and water into glucose. This glucose is:

transported to the growing parts of the plant for use in respiration

transformed into cellulose, proteins and oils

turned into starch for storage

Therefore, to test if a plant has been photosynthesising, you can test the leaf to see if starch is present.