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General questions on photosynthesis
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- 1What does a plant need to photosynthesise?Carbon dioxide, water, light, and chlorophyll -which needs magnesium ions.
- 2Why would a plant need a healthy root system to photosynthesise?To photosynthesise, plants need chlorophyll and water. But to make chlorophyll, you need magnesium ions, so roots are used to get these ions and water which are vital for photosynthesis.
- 3When and why would plants carry out the reversal of photosynthesis.This reversal is called respiration, it happens all throughout the day, especially at night. As there is no light at night, there is no energy for photosynthesis. Plants use this time to release energy from food to function - ie they respire
- 4Why is clearing large amounts of forest areas worrying scientists?The trees take in carbon dioxide, and release oxygen.
- 5Why do plants look green?The pigment - chlorophyll is green, it is in chloroplasts which are on the upper layer of the leaf. The layer above them is transparent. So the visible green chloroplasts reflects the green light making it look green.
- 6In which direction does the water in the xylem travel?It travels upwards as it progresses from the roots, to the stem and veins.
- 7Where in the cells does photosynthesis occur?In the chloroplasts
- 8Why is excess sugar often stored as starch and not simple sugar?Simple sugar can dissolve in water, and the plant would not be able to return the sugar. But starch is insoluable so it can be easily stored.
- 9Why are leaves often arranged so they do not shade each other?So that each leaf can recieve light.
- 10What substances are made with photosynthesis?Glucose and oxygen.
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- Flashcards with general questions about photosynthesis
- Erstellt von
- ELIZABETH Poyner
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- Erstellt von Fatima K · 28 Mär 2016
- Kopiert von ELIZABETH Poyner · 2 Mär 2017
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