2021 NECO BIOLOGY ANSWERS

2021-NECO-BIOLOGY-ANSWERS⇓

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BIOLOGY-OBJ!-By-ExamAccess.Net

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BIOLOGY-THEORY

INSTRUCTIONS: ANSWER 3 QUESTIONS ONLY

(1a)
(i) To search for food.
(ii) Escape predators.
(iii) Find mates for reproduction.
(iv) To disperse/reduce competition/overcrowding by moving to new locations.

(1bi)
Phloem: Responsible for the transportation of enzymes/hormones.

(1bii)
Leaf: is used for photosynthesis

(1biii)
Xylem; is to transport water from roots to stems and leave

(1biv)
Flower; is for reproduction in plant

(1ci)
(i)Low water requirements
(ii)No leaves or small number of leaves
(iii)Possession of thorn or needles

(1cii)
(i)it provides new cells for growth
(ii)for replacement of worn-out cells

(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)
(i)Evidences from Palaeontology
(ii)Evidences from Comparative Morphology
(iii)Evidences from taxonomy
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(2a)
(i)Eye lids
(ii)Conjunctiva

(2bi)
Excretion is the removal of waste products of metabolism which are harmful or would in time interfere with the normal functions of the organisms

(2bii)
Competition is an interaction between a number of the organisms of the same or different species for resources in limited supply such as food, water , space and light

(2biii)
Deforestation is the extensive cutting down of trees for the purpose of either farming it firewood or mining thereby exposing the top soil to agents of erosion

(2c)

(2d)
(i)Refrigeration
(ii)Canning
(iii)Dehydration or drying of foods
(iv)Pasteurization
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(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
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(4ai) Aestivation is behavioural adaptation in which some animals spend hit weather in inactive condition.

(4aii)
– Skin
– Eye
– Ear
– Tongue
– Nose

=FUNCTIONS=
– Skin: Detects temperature and pressure changes, pains and touch
– Eye: Vision
– Ear : Hearing and balance
– Tongue: Tasting
– Nose : Smelling

(4aiii) When you spin, the endolymph slowly moves in the direction you are spinning. The movement of the endolymph signals the brain that the head is spinning. The brain quickly adapts to the signal because the endolymph begins to move at the same rate that you are spinning and no longer stimulates the hair cells. However, when you stop spinning, the endolymph continues to move and stimulate hair cells in the opposite direction. These hair cells send signals to the brain. The brain determines that the head is still spinning, even though you have stopped. This is where the dizzy feeling comes from. Eventually, the endolymph stops moving, no signals are sent to the brain, your brain determines that your motion has stopped, and you no longer feel dizzy.

(4bi)
Neuron; transmit information to other nerve cells, muscle, or gland cells.

(4bii)
cerebrum; initiates and coordinates movement and regulates temperature

(4biii)
Mendulla Oblongata; passes messages between your spinal cord and brain.

(4biv)
cerebellum; coordinates voluntary movements

(4ci)
Tabulate;
(i)tropic the effect is more or less permanent while Nastic movements are temporary and reversible.

(ii)Stimuli for the tropic movements are unidirectional and never diffuse while The stimuli for the Nastic movements may be unidirection or diffuse.

(iii)Movement in tropic movements is directional while Nastic movements is non directional

(4cii)
(i)Contains chlorophyll Absorbs light

(ii)Stomata Allows carbon dioxide to move by diffusion into the leaf

(iii)Guard cells To open and close the stomata depending on the conditions

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COMPLETED

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