2021 WAEC GCE Biology (Essay & OBJ) Answers [13th December]

Get Free Live 2021 WAEC GCE August/September (2nd Series) BIOLOGY (BIO) Essay & OBJ & Practical Questions and Answers for Private Candidates Free of Charge | WAEC GCE Aug/Sept Free Biology Questions and Answers (Essay & OBJ) EXPO Room (13th December, 2021).

WAEC GCE AUGUST/SEPTEMBER 2021 FREE BIOLOGY (BIO) QUESTION AND ANSWER ROOM [PRIVATE CANDIDATES]

Monday, 13th December, 2021
Biology 2 (Essay) – 9:30am – 11:10am
Biology 1 (Objective) – 11:10 – 12:00pm
Biology 3 (Alternative to Practical Work) – 2:00pm – 4:00pm

A. 2021 WAEC GCE BIOLOGY ESSAY (THEORY) ANSWERS | 13TH DECEMBER, 2021

(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

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(4a)
The process takes place in three main steps which are: initiation, elongation and termination. In order to fit within a cell's nucleus, DNA is packed into tightly coiled structures called chromatin, which loosens prior to replication allowing the cell replication machinery to access the DNA strands. The later leads to the replication of the gene.

(4bi)
It houses the gene

(4bii)
(i) X-chromosome
(ii) Y-chromosome

(4c)
This is because the process of cell division takes place. During this process, meiosis occurs leading to the production of haploid number of chromosomes (n) from a diploid number

(4d)


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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 

 

B. 2021 WAEC GCE BIOLOGY OBJECTIVES (OBJ) ANSWERS | 13TH DECEMBER, 2021

1-10: ABABDCDDCC
11-20: AACDAADADB
21-30: ACCBDACDCB
31-40: BDBACBAAAC
41-50: DDDBCACAAC


C. 2021 WAEC GCE BIOLOGY PRACTICAL ANSWERS | 13TH DECEMBER, 2021

1ai)

I - Standard petal

II - Karel petal

III - Wing petal

IV - Stigma

V - Style

VI - Ovule

VII - Receptacle

VIII - Plumule

IX - Endocarp

X - Epicarp


(1aii)

(i) It aids pollination because of the colour

(ii) It receives pollen grains firm the anther

(iii) It forms the seeds of flowering plant

(iv) It protects the fruits from drying up


(1b)

(i) It possess attractive colour which attracts insects

(ii) The pollen grains are sticky


(1ci)

III --> VII

IX --> VI

I --> V


(1cii)

The fruit is formed after pollination. The pollen grains moves into the ovary and from this ovule is formed. The Ovule the developed to form the fruit


(1di)

Marginal placentation


(1dii)

(i) Pea

(ii) Sunhemp

(iii) Hibiscus


(1e)

Explosive mechanism


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(3ai)

G - Bird

H - Lizard


(3aii)

I - Tail

II - Wing

III - Beak

IV - Claws

V - Eyes

VI - Digit

VII - Gular fold

VIII - Tail


(3aiii)

I. It propel the birds

II. It is use for sight

III. It detects sensations


(3bi)

(i) Presence of claw

(ii) Presence of tail

(iii) Presence of scales

(iv) Presence of eyes


(3bii)

[Tabulate]


-BIRDS-

(i) Presence of beak

(ii) Presence of wing

(iii) Presence of neck

(iv) Absence of gular fold

(v) Absence of nuchol crest


-LIZARD-

(i) Absence of beak

(ii) Absence of wing

(iii) Absence of neck

(iv) Presence of gular fold

(v) Presence of nuchol crest


(3ci)

G - Aves

H - Reptilia


(3cii)

G - Terrestrial habitat

H - Terrestrial habitat


(3di)

(i) Possession of beak for catching insects and cracking seeds

(ii) Possession of three toes in the front and one toe in the back make perching easy.


(3dii)

(i) Possession of detachable tail for safety to escape from the predator

(ii) Possession of four legs and powerful limb to escape from the predator

 

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