7- What is the name given to plants which grow in the absence of light. Give one typical feature of such plants.
8- How does the length of daylight affect the breeding behaviour of mammals?
9-What is the biological significance of seasonal breeding behaviour?
10- What if the biological significance of photoperiodism in plants (with respect to flowering)?
Answers (Q6 is missing) 1- Short day plant 2- Photoperiodism 3- Testes and ovaries 4- Equator or temperate regions 5- Spinach 7- Etiolated ½, elongated internodes/weak stem/small- curled-yellow leaves (max of ½ for one good answer) 8- Gonads become active at only certain times of year 9- Young are born when there is plenty of food? Weather is warmer 10- Flowering at the same time so that cross- pollination can take place.