Biology Revision Source

1. The semipermeable membrane surrounding the cytoplasm of a cell. (4, 8)
5. The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product. (14)
6. The part of the alimentary canal which connects the throat to the stomach. In humans and other vertebrates it is a muscular tube lined with mucous membrane (10)
7. The action of breathing. (11)
8. A mature haploid male or female germ cell which is able to unite with another of the opposite sex in sexual reproduction to form a zygote. (6)

2. A rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants it consists mainly of cellulose. (4, 8)
3. The process of taking air into and expelling it from the lungs. (9)
4. An acronym often used to help remember all the necessary features of living organisms: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition. (3, 4)
9. A crystalline sugar occurring naturally un fruits, honey etc. (7)
10. A pore in a plant leaf that controls the passage of gases into and out of the plant (7)

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