HQ-Chap.32. 1- A plant which needs a minimum number of hours of darkness (or more) to flower is called what?

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Presentation transcript:

HQ-Chap.32

1- A plant which needs a minimum number of hours of darkness (or more) to flower is called what?

2- What is the name of the process by which plants respond to the length of daylight and darkness?

3- What is meant by gonads?

4- Which geographical location tends to be inhabited by short day plants?

5- Example of a long day plant.

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.