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21.
Which of the following hormones is produced during fright or when agitated?
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A.
insulin
B.
adrenalin
C.
thyroxine
D.
pituitary
Explanation. Give a better Explanation
Adrenalin is produced form adrenal gland (B).


22.
Grasses - Grasshopper - Lizards - Snakes - Hawks. In the food chain, the organisms which are the least in number are
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A.
grasses
B.
hawks
C.
lizards
D.
snakes
Explanation. Give a better Explanation
The number decreases while the size of the species increase as we move to the upper trophic level of the food chain (B).


23.
One significant difference between roots and stem is that
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A.
branch root originate in the pericycle while branch stems do not.
B.
Stems are always below the ground while rots are always under the ground
C.
Stems are positively geotropic while roots are negatively geotropic
D.
Stems are sometimes used for storage while roots are never so used.
Explanation. Give a better Explanation
(A)


24.
The arrangements below are steps in protein digestion. Which is the correct sequence? A - polypeptides, B - protein, C - amino acids, D - peptones
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A.
a->b---c->d
B.
c-d---a-b
C.
b->c->a->d
D.
b->d->a-c
Explanation. Give a better Explanation
Protein > peptone(d) > polypeptide (a)> amiftacid(c). (D).


25.
Partially digested food ready to leave the stomach is called
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A.
chime
B.
curd
C.
glycogen
D.
paste
Explanation. Give a better Explanation
The walls of the stomach are muscular and regular peristatic movements churn up the food, mixing it thoroughly with the gastric juice. By the time it is ready to leaves the stomach, the food looks like a watery paste, called CHYME (A).


26.
The particles found in the blood which play an important role in blood clotting are called
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A.
platelets
B.
red blood cells
C.
monocytes
D.
granulocytes
Explanation. Give a better Explanation
(A)


27.
In a cross between a normal male and a female carrier for haemophiliac disease, the percentage of their sons expected to suffer the disease as haemophiliac is
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A.
25%
B.
50%
C.
70%
D.
45%
Explanation. Give a better Explanation
Heamophilia is an abnormality controlled by a recessive gene located on the y - chromosome. The percentage of the carrier is 50% (B)


28.
Which of the following is the basic unit of classification of plants and animals?
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A.
genus
B.
species
C.
phylum
D.
kingdom.
Explanation. Give a better Explanation
All living things are classified into 2 major kingdoms, plant and animal kingdom (D)


29.
Alternation of sexual and asexual method of reproduction is found in
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A.
euglena
B.
blue green algae
C.
ferns
D.
grasses
Explanation. Give a better Explanation
The prothallus of a fern is equivalent to the gametophyte generation of a moss because it generations. That is, in their life cycle a sexual (sporophyte) generation and sexual (gametophyte) generation alternate (B). bears the sexual organs, while the fern plant is equivalent to the sporophyte or spore bearing generation, so we can say plant like fern and mosses show alternation of generations. That is, in their life cycle a sexual (sporophyte) generation and sexual (gametophyte) generation alternate (B).


30.
_________ is not a non-seed plant
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A.
cycad
B.
conifer
C.
fern
D.
none of the above
Explanation. Give a better Explanation
Confer belongs to the gymnosperms family. These are plant with naked seeds, they do not bear flowers. The seeds are borne on special structures called Cones (B)


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