A plant with variegated (two-coloured) leaves was left in the sun for several hours. A piece of one of its leaves were then detached (removed) and tested for sugar. Explain, as fully as you can, why the yellow region of the leaf had not produced sugar. (5 marks)

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It does not contain chlorophyll which is needed to absorb light or energy.

The parts without chlorophyll do not photosynthesise, and so they do not make starch and the iodine does not change colour.

The green parts contain chlorophyll and photosynthesise to make starch.

The white part of the leaf does not contain chlorophyll, so does not photosynthesise.

Explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.