K.C.S.E Biology Q & A - MODEL 2014PP1QN18
Explain why four months after fertilisation, ovaries can be removed from a human female, without terminating pregnancy.
ANSWERS
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K.C.S.E Biology Q & A - MODEL 2014PP1QN18
Explain why mammalian testes are located to hang outside the body
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN06
State three roles of auxins in a plant stem.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN04
The diagram below illustrates a growing pollen tube.
​(a) Name the part labelled B.
(b) Explain the role of the parts labelled A.
ANSWERS
(a) Tube nucleus;
(b) One male nucleus fuses with the egg cell nucleus to form a zygote; The other male nucleus fuses with the polar nuclei to form the endosperm;
K.C.S.E Biology Q & A - MODEL 2014PP1QN03
State two functions of the placenta in mammals.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2013PP1QN27
State the importance of moulting to an insect.
answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN27
State two differences between complete and incomplete metamorphosis.
answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN18
How is the human sperm cell structurally specialised?
answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN17
Name the flower part that produces gametes.
answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN16
Name three mechanisms that ensure cross pollination takes place in flowering plants.
answers
K.C.S.E Biology Q & A - MODEL 2012PP2QN08
Using a relevant example, describe how an allergic reaction occurs in a human being.
ANSWERS
​An allergic reaction is a hypersensitive response; to an antigen by the body immune
system; The body immune system responds by overproducing antibodies; against harmless antigens; The antigen-antibody reaction occurs on the surface of body cells; which burst open; and release histamines; Histamines cause inflammation/itching! swelling/pain, et.c; which damage the body; Allergic people are hypersensitive to materials like dust/pollen grains/some foods/some drugs/some pollutants,
K.C.S.E Biology Q & A - MODEL 2012PP1QN17
Name two substances that leave the foetal blood through the placenta.
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN15
What name is given to a group of hormones that controls the development of secondary sexual characteristics in a human male?
answer
K.C.S.E Biology Q & A - MODEL 2011PP1QN28
State two ways by which auxins regulate growth in seedlings.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2011PP1QN26
Name the gamete cells that are produced by the ovaries.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2011PP1QN23
The diagram below represents a transverse section of an ovary from a certain flower.
a) (i)Name the structure labelled W.
(ii)Name the type of placentation illustrated in this diagram. (b) Give an example of a plant whose flowers have the type of placentation named in (a)(ìi) above.
ANSWERS
(a) (i) Ovule;
(ii) Axile placentation; (b) Orange or any correctly named citrus plant; |
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