2019 Neco Gce Biology Obj And Theory Answers

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2019 NECO GCE BIOLOGY ANSWERS
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(1a)
Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves. An example of transpiration is when a plant absorbs water in its roots. 

(1aii)
MITOSIS
(i)Mitosis gives two nuclei, and hence two cells.
(ii) Mitosis gives identical cells to each other and to the mother cell.
(iii) Mitosis gives nuclei with the same number of chromosomes as the mother cell .
(iv) Mitosis includes one division.

{MEIOSIS}
(i)meiosis gives four nuclei
(ii) meiosis leads to genetic variation due to crossing over and independent assortment.
(iii) meiosis gives cells with half the number.
(iv) meiosis includes two division.

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(1ci)
(i) it leads to food production
(ii) it purifies the atmosphere by removing CO2 gas
(iii) it leads to the release of O2 used for respiration

(1cii)
(i) AIDS
(ii) Siphillis
(iii) Gonorrhea

(1ciii)
(i) Satures found in the cranium l
(ii) The joint between vertebrae of the vertebral column
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(3ci)
(i) Diseases: In humans, drinking or consuming polluted water in any way has many disastrous effects on our health. It causes typhoid, cholera, hepatitis and various other diseases.
Destruction of
(ii) Ecosystems: Ecosystems are extremely dynamic and respond to even small changes in the environment. Water pollution can cause an entire ecosystem to collapse if left unchecked.
(iii) Eutrophication: Chemicals in a water body, encourage the growth of algae. These algae form a layer on top of the pond or lake. Bacteria feed on this algae and this decreases the amount of oxygen in the water body, severely affecting the aquatic life there.
Effects the food
(iv) Chain: Disruption in food chains happens when toxins and pollutants in the water are consumed by aquatic animals (fish, shellfish etc) which are then consumed by humans.

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