CAIE A-Level Biology A2 14.1.1 Homeostasis Definition and Importance Questions

Explain starch testing in leaves as evidence of photosynthesis using evidence from each question and mark scheme.

Exam points

Explain starch testing in leaves as evidence of photosynthesis.

[Maximum number: 6]

Explain what is meant by homeostasis in a mammal and explain why it is important to maintain body temperature, blood glucose concentration and the water potential of blood.

any six from:
1 maintain / keep / regulate, internal, environment / conditions ;
2 within, narrow / set, limits or around, optimum value / set point / norm ;
3 low (body) temperature and consequence ;
4 high (body) temperature and consequence ;
5 low blood glucose (concentration) and consequence ;
6 high blood glucose concentration and consequence ;
7 low, (blood) water potential / $\psi$ , and consequence ;
8 high, (blood) water potential / $\psi$ , and consequence ;

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CAIE A-Level Biology A2 14.1.1 Homeostasis Definition and Importance Questions question 1