11. Plants convert this food into _____________ for storage. 12. Cellular respiration provides _____________ to the organism. 13. ____________ respiration produces a greater amount of energy than _____________ respiration.
14. _____________ _____________ causes a burning sensation in muscles after anaerobic respiration has occurred.
K U
Knowledge and Understanding 1. What substances produced in photosynthesis are used in respiration? 2. Why do athletes often consume high energy glucose gels or drinks before and during exercise?
3. Why do you think lactic acid forms in the muscles of athletes even when they are breathing in oxygen?
4. What effect does the availability of glucose have on aerobic respiration in yeast cells? T I
Thinking and Investigating 1. How does the structure of a leaf relate to its function? 2. A cactus has tiny needles instead of typical leaves. This helps to reduce water loss in hot weather. Do you think a cactus can carry out photosynthesis? Explain your answer.
3. ‘Not all oxygen produced by plants is released into the atmosphere.’ Is this statement true or false? Explain your answer.
4. Based on your knowledge of photosynthesis, suggest why rainforests are referred to as the ‘lungs of the earth’.
5. (a) Explain why we breathe faster when we are exercising. (b) Do you think our pulse rate gets faster when our breathing rate increases? Give a reason for your answer.
6. Carbon dioxide levels and light intensity affect the rate of photosynthesis in plants. Imagine you are a gardener trying to grow tomatoes in a greenhouse. How would you design the layout of your greenhouse in order to ensure a good crop of tomatoes?
7. ‘If a plant gains mass as it grows, and if soil is the source of nutrition for plants, then as a plant grows, the soil should lose mass and the plant should gain an amount of mass equal to the amount that the soil loses.’ What do you think the scientist using this hypothesis was trying to find out? Outline an experiment to test this hypothesis. Do you think the results would support or reject the hypothesis? Explain your answer.
