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Waec 2020 biology Practicals questions and answers is out

Waec 2020 biology Practicals questions and answers is out 




(1a)
(i)Specimen A– Clayey Soil.
(ii)Specimen B– A solution of one part of egg albumen mixed with two parts of water in a test tube/beaker.
(iii)Specimen C— Mushroom (freshly plucked).

1d(iii)
Yeast
Mushrooms
Moulds
Truffles

1e(i). Phylum Mollusca

1f i.)  Saprophytic    Nutrition 

1f ii.) Mushrooms are low in calories, cholesterol, and sodium. But they’re also packed full of vitamins, minerals, and other nutrients.

(2a) 
E: Succulent Fruit
F: Berry/Flesh Fruit
H: Legume/Pod 

(2b) 
E: Parietal Plancentation 
F: Axile Plancentation

(2c) 
E: Human
F: Animal
H: Explosive Mechanism

(2d) 
-i-  Specimen E attract birds, squirrels, and other small mammals. Consumption of the fruit will lead to dispersal of the seeds in feces (by human)

-ii- Vitamin C, Magnesium, Iron, Copper, and Manganese.

(2e)
-i- Green
-ii- It signifies that it's still young.

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2020 BIOLOGY SPECIMEN (WAEC)

Specimen A – Clayey Soil. 

Specimen B – A solution of one part of egg albumen mixed with two parts of water in a test tube/beaker.

Specimen C — Mushroom (freshly plucked).

Specimen D — Giant land snail. 

Specimen E – Transverse section of ripe pawpaw fruit. 

Specimen F – Transverse section of ripe tomato fruit.

Specimen G – Fresh pod of cowpea plant. 

Specimen H – Complete,green pod of pride of Barbados plant. 

Specimen J – Fresh Okro fruit. 

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GROUP II (FOR CANDIDATES IN GHANA ONLY)

Specimen K – Adult cockroach (dead). 

Specimen L – Nymph of cockroach (dead).

Specimen M – Egg case of cockroach /ootheca. 

Specimen N– Moss plant in petri dish.

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GROUP III (FOR CANDIDATES IN NIGERIA,SIERRA LEONE THE GAMBIA AND LIBERIA)

Specimen P– Potassium Permanganates solution. 

Specimen Q– Granulated am sugar (100g) in a beaker. 

Specimen R –5-day old boiled egg with shell intact store in a worm place /rotten egg with shell     intact. 

Specimen S – 10ml of lime/lemon juice in a test tube.

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Note: BELOW are last year exam.

*(Number 4)*


(4ai)

This states that during the formation of gamete the distribution of one pair of allele does not affect the distribution of other allelic pair.


(4aii)

Blood group O can only exist in homozygous form because it has no antigen on its red blood cell while blood group A can exist both in homozygous and heterozygous form because of the presence of antigen on their blood cell.therefore they exhibit co-dominance.


(4b)

Class of vertebrate| Example


Pisces | cat  fish

Amphibians | toad

Reptiles | lizard

Aves |  bird

Mammals | man

(6ai) 
External Fertilization: This type of fertilization occurs when the sperm from the male animal meets the egg/ovum from the female animal, outside the body of the animal. It is common in pisces and amphibians.

(6aii) 
Internal fertilization: a type of fertilization by which the sperm from the male meets the egg/ovum inside the body of the animal. It is common in mammals and birds.

(6bi) 
(i) Pisces e.g: Tilapia, Croaker, Titus
(ii) Amphibians e.g.: Frogs, Toads, Newts

(6bii) 
Internal fertilization:
(i) Mammals e.g. Man, Rat, Monkeys
(ii) Aves e.g. Parrots,Hawks, Eagles

(6ci)
(i) Malnourished and underdeveloped foetus
(ii) Low supply of oxygen to the foetus due to reduced diffusion
(iii) Leads to the death of foetus and miscarriage of pregnancy

(6cii)
(i) Amnion
(ii) Amniotic fluid
(iii) Umbilical cord

(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.

WAEC 2020/2021 Biology Obj & Essay/Theory Questions answers is out .


WAEC 2020/2021 Biology Obj & Essay/Theory Questions and Answers is Out now 

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Please note: This is last year WAEC 2019 biology obj and theory answers below.


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(1ai)
- Tadpole - Skin 
- Cockroach - trachea 
- Domestic fowl - lungs 
- Talinum - stomata 
- Earthworm - Skin 
- Amoeba - cell membrane 
(1aii)
- Large surface area 
- Thin respiratory surface 
- Moist surface 
- Efficient transport system 
- Permeability


(6ai)
The enormous energy of lightning breaks nitrogen molecules and enables their atoms to combine with oxygen in the air forming nitrogen oxides. These dissolve in rain, forming nitrates, that are carried to the earth.
(6aii)
This organism oxidizes ammonia into nitrite as a metabolic process. Nitrosomonas are useful in bioremediation. They are important in the nitrogen cycle by increasing the availability of nitrogen to plants while limiting carbon dioxide fixation.
(6aiii)
Azotobacter helps to synthesizes some biologically active substances, including some phytohormones such as auxins, thereby stimulating plant growth.
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