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*WELCOME TO BLASTEXAMS BEST EXAM PORTAL*
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Use this pls

*BIOLOGY OBJ*

1-10:CBDBDBBBBC

11-20:BBCCBADDDC

21-30:DBCCCCBAAA

31-40:CCADCBAACB

41-50:CBCBBBBDAB

BIOLOGY ESSAY & OBJ ANSWERS

Obj loading……….

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Theory

1a.
This is the structure of mammal that provides mechanical support for the body

1b

i. Exoskeleton eg..
ii. endoskeleton eg. Mammals
iii. Hydrostatic skeleton eg. Soft body animals

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(2a)
Vitamins are group of organic compounds which are essential for normal growth and nutrition and are required in small quantities in the diet because they cannot be synthesized by the body.

(2b)
Vitamin: C
One Function: Healing of wounds
One Deficiency: Scurvy
One Source: Citrus Fruits

Vitamin: D
One Function: Strong bones and teeth
One Deficiency: Rickets
One Source: Eggs

Vitamin: B
One Function: Releases energy from cabohydraes
One Deficiency: Beri-beri
One Source: Yeast

Vitamin: K
One Function: Clotting of blood
One Deficiency: Failure of blood to clot
One Source: Milk

(2c)
(i) Iron: Assists in nitrate and sulfate reduction and energy production within the plant

(ii) Nitrogen: For rapid growth

(iii) Calcium: It is responsible for holding together the cell walls of plants

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3a)
1) Food chain
Mango trees Caterpillars->
Producer) (Primary consumer)

-chicks of foul thank
secondary consumer) (Tertiary Consumer)

ii)Pyramid of numbers
Hawks 1o
chicks 30
Caterpillars 80
Mango trees 50

b) Benefits of
1) Water
– it serves as a medium of transportion
– it is useful for agricultural purposes eg earthworm
– it provides employment for people

ii) Soil
– it is the home of some organisms
– it the source of some mineral
resources

iii) Forest
-it supports forest and wildlife
– they are sources of raw materials
– They are sources of timber for
for Industries eg collon, nibber
– They provide medicinal herbs

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(6a)
(i) Rokert hoot
(ii) Felix Diyardin
(iii) Mathias Schleidon.
(iv) Theodor Schwom

(6b)
In a tabular form:
Classes of plants based on life cycle and Two examples

Classes | Examples
(i) Anual | Vegetable, Cotton
(ii) Biennials | Carrot, Ginger
(iii) Perennials | Cocoa/banana

(6c)
The amniotic fluid help to neutralize the effect of changes of external temperature

(6d)
(i) Rhizobium : It helps to fix atmospheric nitrogen directly into the plant.
(ii) Azotobacter: It can fix atmospheric nitrogen into the soil either aerobically or anaerobically.
(iii) Blue-green algae: They are mainly auto trophic plants; they can synthesize their own food.

(6e)
Draw the diagram


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