2020/2021 WAEC/NECO Answers: 2021 neco Gce biology answers



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This is actually the 2019 neco Gce biology answersAnswers as questions sent to our subscribers on WHATSAPP, if you are looking for 2021 WAEC/NECO Answers midnight before the exam, try contacting us.

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(5ai)
(i) Regulation of extracellular fluid volume. The kidneys work to ensure an adequate quantity of plasma to keep blood flowing to vital organs.
(ii) Regulation of osmolarity.
(iii) Regulation of ion concentrations.
(iv) Excretion of wastes and toxins.
(v) Production of hormones.
(vi) Regulation of pH.

(5aii)
[Pick Any TWO]
(i) Frequent urination.
(ii) Excessive thirst.
(iii) Unexplained weight loss.
(iv) Extreme hunger.

(5b)
Click Here
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(3ai)
In a tabular form:

POLLINATION:
(i) It occurs only in flowering plants.
(ii) It involves only one sex cell type (male).
(iii) It requires external agents.
(iv) No fusion of gametes involved.

FERTILIZATION:
(i) Occurs in all sexually reproductive plants.
(ii) Involves two sex cells types (male and female).
(iii) Does not require external agents.
(iv) Involves fusion of gametes.

(3aii)
(i) Wind
(ii) Insects

(3bi)
(i) Herbivores
(ii) Carnivores
(iii) Omnivores

(3bii)
(i) Herbivores -Goat
(ii) Carnivores - Lion
(iii) Omnivores - Man

(3Ci)
(i) It kills aquatic organisms.
(ii) It makes water unsafe for consumption and domestic uses.
(iii) It reduces light penetration in water hence affecting aquatic plants.
(iv) It puts fishermen out of business.

(3cii)
(i) It transport unwanted materials to sites of excretion
(ii) It transport nutrient to all body cells
(iii) It helps in fighting infection
(iv) It brings about clotting.


(3)
CLICK HERE FOR THE IMAGE
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(2a)
CLICK HERE FOR THE IMAGE

(2bi)
(i) Eyelids
(ii) Conjunctive
(iii) The eye socket

(2bii)
(i) Cutting
(ii) Layering
(iii) Marcotting
(iv) Budding

(2ci)
(i) Precipitation
(ii) Condemnation
(iii) Evaporation

(2cii)
(i) P.H
(ii) Current
(iii) Pressure
(iv) Waves
(v) Sunlight
(vi) Turbidity
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(1ai)
Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.

(1aii)
PLS TABULATE:

MITOSIS:
(i) Occurs in somatic cell/growth of somatic cells; (ii) Diploid cell formed
(iii) Two daughter cells are formed (iv) Chromosome number of parent is same as that of daughter cell

MEOSIS:
(i) Occurs during gamete/sex cell production
(ii) Haploid cell formed
(iii) Four daughter cells are formed
(iv) Chromosome number of parent twice that of daughter cells

(1b)
[Pick any FOUR]
(i) They are protein in nature
(ii) They remain chemically unchanged at the end of a reaction;
(iii) They are denatured/destroyed at high temperature/inactivated at very cold temperatures
(iv) Enzyme action is retarded by poison or inhibitors
(iv) Enzymes are soluble
(vi) They speed up rate of biochemical reactions in cells

(1ci)
Human beings are solely dependent on photosynthetic plants for their oxygen requirements
(ii) It decreases the concentration of carbon dioxide and other harmful industrial wastes that leads to respiratory problems in living beings.

(1cii)
[Pick any TWO]
(i) Gonorrhea
(ii) Human Immunodeficiency Virus (HIV)
(iii) Syphilis
(iv) Genital Herpes

(1ciii)
(i) Sutures found between the bones of the skull
(ii) Syndesmosis between long bones of the body



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