Question

.8 When a rolled-up hosepipe, that was lying on the lawn for a few days, is lifted
from the lawn, the grass underneath the hosepipe is not green, but yellow white
Why does this happen?​

Answer 1

Explanation:

If you leave grass alone underneath a yogurt container, it will turn yellow. Why does this happen? While people go to the grocery store to buy food so that they can survive and grow, plants can make their own food through a process called photosynthesis. This process involves water, carbon dioxide, and light, and is controlled by chloroplasts, tiny organ-like structures (or organelles) that contain a green pigment called chlorophyll. Chloroplasts also contain other pigments like xanthophylls (yellow) and carotenes (orange).

You’ve likely seen these non-green pigments at work before! If you live in a place with deciduous trees, in the fall you will see the leaves changing color. While they’re working on making food in the spring and summer, the leaves green becaue of all the chlorophyll—but as the days get shorter and darker, the chlorophyll production slows down and the other pigments become more visible. This is why you see yellow and red leaves.

The same thing happened to your grass in the dark. Grass turning yellow can be explained this way: when the grass was no longer exposed to sunlight, chlorophyll production slowed and pigments like xanthophylls became visible. This loss of green is called chlorosis.

During photosynthesis, plants also absorb carbon dioxide while releasing oxygen. Plants still need to absorb some oxygen to help them break carbohydrates down into energy. At night, plants take in a little oxygen from the air—about a tenth of what they produce in the daytime. Over time, a plant in a place that’s completely airtight might have difficulty balancing carbon dioxide and oxygen in its environment. When you added yogurt containers with flaps and holes, this allowed oxygen to enter the container even though there was not a lot of light. Did you notice much of a difference in plant growth? Now, let’s think about what happened to your plants growing under the cellophane filters. Light has all of the colors of the rainbow in it, and plants need all of those colors to grow well. Plants without the full spectrum will grow in strange ways. Plants will grow tall and spindly in red light. Blue light controls leaf development, so plants will be short and stocky.

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