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小 發表於 2011-10-30 02:32 PM (第 4533 天)
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Help me to solve these science questions,plz!!
1 The green part of a leaf contains ? which can be removed by ? .
2 Keeping plants in the dark for a few days can remove all the starch stored in the leaves. This is called ? .
3 ? balances the amount of carbon dioxide and oxygen in nature and produces ? for all living things.
4 A ? leaf contains non-green parts.
5 Another name of green plants.
6 ? needs to feed on plants as they cannot make their own food.
7 It is similar to burning but no flame is involved in the process.
8 Usually green plans contain this pigment.
9 A substance in cigarette which can cause cancer.