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Waec Gce Biology Essay and Objective Question and Answer 2021

Waec Gce Biology Essay and Objective Question and Answer 2021

 

2021 Waec Gce Biology Answers
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BIOLOGY OBJ
01-10: ABABDCDDCC
11-20: AACDAADADB
21-30: ACCBDACDCB
31-40: BDBACBAAAC
41-50: DDDBCACAAC

COMPLETED

===================================

 

THEORY-ANSWERS

(1a)
(i) Spiders senses through their cuticles while insects possesses one pair of antenna
(ii) The body of spiders is divided into two segments: cephalothorax and abdomen, whereas the body of insects is divided into three segments: head, thorax, and abdomen.
(iii) Spiders have eight legs while insects have six pairs of legs
(iv) Spiders have four appendages while insects have three

(1bi)
[Tabulate]
PRAWN:
(i) It has ten legs
(ii) Has two body segments
(iii) Absence of wings
(iv) Possession of rostrum
(v) Absence of stylus

COCKROACH:
(i) It has six legs
(ii) Has three body segments
(iii) Possession of wings
(iv) Absence of rostrum
(v) Presence of stylus

(1bii)
(i) Both has compound eyes
(ii) Both posseses antenna
(iii) Both has abdomen

(1c)
(i) Possession of detachable tail for safety when it needs to escape from the predator
(ii) Possession of sharp, tricuspid teeth that help catch, grab, grip, and cut prey
(iii) Possession of four legs and has powerful limb for escape
(iv) Possession of fringe-toe which enables them move quickly across the sand.
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(2a)
Photosynthesis can be tested by testing for starch in a green leaf. The leaf is detached after about 2-3 hours in the sun, boiled and then the green pigment is extracted using alcohol. Iodine solution is then added to the leaf. It turns blue-black, it shows photosynthesis has taken place.

(2bi)
(i) Oxygen
(ii) Carbon dioxide

(2bii)
(i) Oxygen : Water in leaf
(ii) Carbon dioxide: Atmosphere

(2ci)
This is because they do not have teeth and they can not chew solid particles

(2cii)
(i) Minerals
(ii) Vitamin
(iii) Protein
(iv) Carbohydrate

(2d)
Add some of the egg white to the biurets solution in the test tube and mix thoroughly while still hand warming. The blue colour will change to violet to show the presence of protein
===================================

 

(3ai)

Predation

 

(3aii)

(i) Competition

(ii) Temperature

(iii) Water

(iv) Food

(v) Disease

 

(3b)

[Tabulate]

 

-TIME-

10

20

30

40

50

 

-GIRAFFE-

120

160

140

120

140

 

-LION-

50

20

30

60

20

 

(3c)

The graphs shows the inverse relationship between the giraffe and lion at every instant period of time. In each month, a decrease in lions leads to an increase in giraffe and an increase in lions leads to a decrease in giraffe.

 

(3d)

Prolonged drought will result to a decline in the population of both species due to drought which will affect the availability of food.

 

(3e)

(i) The population of giraffe will decrease due to an increase in predation

(ii) The population of lions will decrease overtime due to competition for food.

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(5a)
Chemosynthesis is a process through which certain bacteria synthesize their food using inorganic materials in the soil. It is form of autotrophs nutrition eg Nitrification

(5b)
(i) Sunlight
(ii) Carbohydrate

(5c)
(i) Photosynthetic/holophytic
(ii) Carnivorous

(5d)
(i)Maize, rice
(ii)Sundew, dodder’s plant

(5e)
(i) It conduct and transmit the sensation of odour
(ii) Anterior end if cerebrum
(iii) Nose
(iv)They are both sense organs and they both transmit impulse in form of fluid. They are both connected via epiglottitis. They both transmit their impulse to the brain.

(5f)
(i) This can be defined as a behaviour that results in mating and eventual reproduction in animals. It is a form of display throwing readiness for mating

(ii) In domestic fowl, the female spread their feathers whenever a female shortly making undue noise which shows readiness for mating

(5g)
(i) Possession of bigger body which enables them to cater for the caste
(ii) Possession of sting to fight against predator
(iii) Possession of Wings for flight
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Also Read : WAEC GCE Physics Obj & Essay Questions And Answer 2021

 

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