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:

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.