NECO 2021 Biology Obj And Essay Question And Answer Now Available

neco

1-10 ECCECDBBBD
11-20 BCEBBACEEB
21-30 EECDDDCBAA
31-40 DDBECCCCBA
41-50 CDEDEADEEE
51-60 CBAABADCBE

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

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

3a)

i. four daughter cells

ii. two identical daughter cells

3bi)

1. Sexual Reproduction produces variable offspring creating diversity and variation among populations

2. It is important for plants as it provides variation to the progeny that helps in better survival

3. It is very much important for evolution. 

3bii)

The relationship between remora fish and shark can be considered as mutualism. Remora attaches itself to the shark, to travel different parts of the sea by floating with the shark. It helps the remora fish to travel without burning energy. They also get to eat scraps of food dropped by the shark.

3ci)

1. fever

2. dry cough

3. tiredness

3cii)

The main blood vessel that carries blood from the kidney and ureter to the inferior vena cava.

3d)

i. An ecological niche is the part of the environment into which a species fits, and to which it is adapted. 

ii. Population density is the number of individuals per unit geographic area, for example, number per square meter, per hectare, or per square kilometer.

iii. A climax community is the final stage of succession, remaining relatively unchanged until destroyed by an event such as fire or human interference.

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

(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.

(4bi)
(i) Neuron helps to keep is alive (even when we are asleep) i.e. the automatic nerves.

(4bii)
(i) The cerebrum controls all voluntary actions, e.g. movement of legs, arms, speech e.t.c.

(4biii)
(i) The medulla oblongata controls the constriction and dilation of the blood vessels this regulating blood pressure.

(4biv)
(i) The cerebellum coordinates the various muscles actions in involuntary responses.

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

(5ai)
Courtship behavior in Agama Lizard
(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)

1)hemophilia
2)red-green color blindness
3)congenital night blindness
4)high blood pressure genes, 5)Duchenne muscular dystrophy
6)Fragile X syndrome.

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

5aiii)

Cockroach :
It belongs to class-Insecta.
They contain 3 pair of legs.
Body divided into head,thorax and abdomen.
They contain sensory organ called antenna.
They bear 2 pair of wings.
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.

325 Views
Share this:

Be the first to comment

Leave a Reply

Your email address will not be published.