To test a leaf for starch, the leaf is boiled in water
Plant Physiology (10)Complete the following paragraph by filling in the blanks (i) to (v) with appropriate words:
To test a leaf for starch, the leaf is boiled in water to (i) ____. It is then boiled in Methylated spirit to (ii) ____. The leaf is dipped in warm water to soften it. It is placed in a petri dish, and (iii) ____ solution is added. The region of the leaf which contains starch, turns (iv) ____ and the region which does not contain starch, turns (v) _____.
Answer
- kill the cells
- remove chlorophyll / decolourise the leaf
- Iodine / Potassium iodide / K1 / I2
- blue black / blackish blue / dark blue / Indigo
- yellowish brown / reddish brown / yellow / golden brown
- Exam Year: 2018