2021 Neco Biology questions and answers

BIOLOGY OBJECTIVE

01-10: ECCECEBBBD
11-20: BCAEBDCEEB
21-30: EECDADCBAE
31-40: DDBECCCCBA
41-50: ADDEEADDEA
51-60: EEDADACBBB

COMPLETED


ESSAY

1a )

1. In the search of food for their survival.

2. To protect themselves from their enemies.

3.To get a suitable temperature for their reproduction.

4.To get a perfect habitat to increase their survival rate

bi ) it is responsible for the transport and distribution of sugars produced by the photosynthesis.

ii) it is responsible to produce food for the plant by photosynthesis

iii) it is responsible to transport water from roots to stems and leaves, but it also transports nutrients.

iv) it is responsible for reproduction

1ci)
1. Low Water Requirements

2.Ability to Quickly Absorb Water

3. Small or No Leaves

1cii)

1. Asexual Reproduction

2. Growth

3. Tissue Repair

1di)

An image is formed on the retina with light rays converging most at the cornea and upon entering and exiting the lens.
Rays from the top and bottom of the object are traced and produce an inverted real image on the retina.
The distance to the object is drawn smaller than scale.

1dii)

1. Morphological Evidences

2. Embryological Evidences

3.Geographical Evidences


(2a)

-[Pick any two]-
(i) orbit
(ii) eyelashes
(iii) eyelids
(iv) conjunctiva
(v) lacrimal glands

(2b)
(i) Excretion is a process in which metabolic waste is eliminated from an organism.

(ii) Competition is an interaction between organisms or species in which both the organisms or species are harmed.

(iii) Deforestation refers to the decrease in forest areas across the world that are lost for other uses such as agricultural croplands, urbanization, or mining activities.

(2c)

(2d)
(i) Freezing
(ii) Boiling
(iii) Dehydration.
(iv) Canning.
(v) Salting
(vi) Sweetening


(3a)

(i) Meiosis : four daughter cells
(ii) Mitosis: two identical daughter cells

(3bi)
(i)It reduces the risk of diseases from parents to offsprings
(ii)It create diversity and variation among populations

(3bii)
The relationship is known as commensalism in which the remora fish gains while he shark neither gain nor loose. In this case, the remora fish attach itself to the shark which transport it round the water protecting it form predators and it also obtain it’s food through the process. The shark on the other hand neither gain or loose.

(3ci)
(i)High fever
(ii)Sore throat
(iii)dry cough

(3cii)
It carries filtered blood from the kidney’s to the posterior vena cava

(3di)
Ecological niche: This is the exact position by an organism in a particular habitat

(3dii)
Population density: This can be defined as the total number of organism per unit area of the habitat

(3diii)
Climax community: This is established when a stable or unchanging community is attained, thus the community is in equilibrium with the environment


(4aii)

(i) Eye.
(ii) Nose.
(iii) Tongue.
(iv) Ear.

Functions Are:
(i) Eye – Sense of sight or vision.
(ii) Nose – Sense of smell.
(iii) Tongue – Sense of taste.
(iv) Ear – Sense of hearing and balance.


(5ai)
(i) A sexually active male lizard is large, brightly coloured/with an orange/blue head
(ii) female lizard is smaller and less colourful/brown with green markings
(iii) dominant male lizard defends its territory
(iv) by driving away/fighting off/lashing other males with its tail
(v) male displays its full colours in front of female
(vi) female responds by arching her back and lifting her tail vertically
(vii) male tries to catch her
(viii) female usually runs away
(ix) when caught mating may take place.

(5aii)
(i)hemophilia
(ii)red-green color blindness
(iii)congenital night blindness
(iv)high blood pressure genes

(5aiii)
-COCKROACH-
(i) It belongs to class-Insecta.
(ii) They contain 3 pair of legs.
(iii) Body divided into head,thorax and abdomen.
(iv) They contain sensory organ called antenna.
(v) They bear 2 pair of wings.
(vi) Their body is covered with a protective layer called as cuticle.

– SPIDER-
(i)It belongs to class-arachnid
(ii)They contain 4 pair of legs.
(iii)Body divided into 2 parts- Prosoma and opisthosoma.
(iv)They lack antenna.
(v)They don’t possess wings.
(vi)They lack cuticle in their body.

IMAGE ANSWERS

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