K.C.S.E Biology Q & A - MODEL 2014PP2QN01

K.C.S.E Biology Q & A - MODEL 2014PP2QN01

​(a) State four characteristics of fruits dispersed by animals.
(b) State two roles of each of the following hormones in menstruation:
(i) luteinising hormone; 
(ii) oestrogen. 

ANSWERS

​(a)

• Fruit fleshy/juicy/succulent;
•  Fruit brightly colouredJlarge/inclusters;
•  Fruit scented has sweet smell/sweet aroma;
•  Seeds have toughlhard testa;
•  Some seeds have sticky/mucoid secretions;
•  Fruits have hooks;

(b) (i) Luteinising hormone: 

• stimulates ovulation;
• stimulates the development of remains of the graafian follicle into corpus luteium:
• stimulate corpus luteum to produce progesterone; 

(ii) Oestrogen:

• stimulate s healing and repair of uterine lining /endometrium following menstruation;
• stimulates pituitary gland to secrete luteinising honnone;