WAEC Biology Obj And Essay/Theory Solution Questions and Answer – Aug/Sept 2020 Expo Runz.

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BIOLOGY OBJ:

1-10: CAABDBBBDC

11-20: AACBDDDCBB

21-30: CBACDAABCB

31-40: CABCCBDDCB

41-50: DCBBCBBAAA

(6ai)

External fertilization is a mode of reproduction in which a

male organism's sperm fertilizes a female organism's egg

outside of the female's body.

(6aii)

Internal fertilization occurs most often in land-based

animals, although some aquatic animals also use this

method. There are three ways that offspring are produced

following internal fertilization.

(6bi)

(i)Toad

(ii)Frog

(6bii)

(i)Goat

(ii)Cow

(6ci)

(i)the foetus will not get oxygen

(ii)the foetus will not get nutrients.

(iii)waste products from your baby's blood will not be

removed

(6cii)

[pick three]

(i)fundus

(ii)corpus

(iii)isthmus

(iv)cervix.

(6d)

Competition in feeding among organisms for scarce

resources leads to the death of weaker members of the

species and the reproduction of the stronger members,

leading to a dynamic equilibrium that balances the rate of

death to the rate of birth.

(6e)

(i) Problem of Wave

(ii) Effects of temperature

(iii) Salinity of the Marine

(iv) Humidity

(6fi)

Moisture helps in the germination of seeds by helping to

activate the metabolic activities needed for germination,

dissolved oxygen content in moisture acts is very

beneficial to the biochemical process involved in

germination.

(6fii)

Viable seeds are healthy and contain the organic

requirements for a healthy germination, and is most times

resistant to harsh weather conditions, and lack of

nutrients.

(6g)

Light energy is considered a limiting factor in production

of food by autotrophs because, photosynthesis which is

the main process by which autotrophs produce food

cannot take place in the absence of light. The energy from

light is solely responsible for the process of

photosynthesis.

SECTION A: ANSWER TWO(2) QUESTIONS ONLY

(1ai)

When the head moves or changes position, the endolymph

fluid in the semi-circular canals moves and stimulates the

nerve endings. The nerve endings then transmit the

impulses through vestibular to the cerebellum of the brain

where the new position at the head is interpreted and the

appropriate responses sent to the muscular system to

maintain body balance

(1aii)

CLICK HERE FOR THE IMAGE

(1aiii)

The middle ear in humans can be split into three parts;

external, middle, and inner. The middle ear lies within the

temporal bone and extends from the tympanic membrane

to the lateral wall of the inner ear. The main function of the

middle ear is to transmit vibrations from the tympanic

membrane to the inner ear via the auditory ossicles.

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(2a)

Deficiency diseases are diseases that are caused by the

lack of certain essential nutrients, especially vitamins and

minerals, in one's diet over a prolonged period of time

(2aii)

TABULATE

- Beri-Beri ; Intake of vitamin B

- Kwashiorkor; Intake of protein

- Scurvy; Intake vitamin C

- Goitre ; Intake of iodine in diet

- Anaemia; Intake of iron and copper

(2bi)

-Put a few small, freshly cut pieces of yam in a clean test

tube, then Pour 10 mL distilled water into the test tube.

-Now, boil the contents of the test tube for about 5

minutes. Allow the test tube to cool.

-Filter the contents of the test tube through a filter paper.

Test the obtained filtrate for the presence of starch by

adding iodine.

-If colour changes to pink then iodine is presence

(2bii)

-Heat a solution of the orange fruit then add Benedict's

reagent and observing the colour change orange.

-It is a clear blue solution of sodiumand copper salts.

-In the presence of simple sugars, the blue solution

changes color to green, yellow, and brick-red, depending.

=≠======================================

(3a)

TABULATE

(i) Disease: Cholera

Causative organism: Bacterium (vibro cholerae)

Vector: Housefly

Control: Keeping environment clean

(ii) Disease: Sleeping sickness

Causative organism: Trypanosome

Vector: tse-tse fly

Control: use of antiseptic

(iii) Disease: Malaria

Causative organism: Plasmodium (protozoa)

Vector: Female anopheles mosquito

Control: Draining of swamps

(iv) Disease: Ringworm

Causative organism: Trichophyton and microsporum

Vector: None

Control: Keeping of skin clean and dry

(3bi)

Salting is the dusting of farm products with table salt

(3bii)

Irradiation is the drying of some crops or products using

the heat from the sun

(3biii)

Smoking is the drying of some farm products over a

smoke of a naked fire

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