Waec 2020 Biology Practical Question & Answers Now Available

 


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WAEC Biology Practical Answers - 2020 May/JuneExam

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TAKE NOTE✔️✔️✔️

 NUMBER 1 2 AND 4 IS FOR CANDIDATE IN NIGERIA

 WHILE NUMBER 3 IS FOR CANDIDATE IN GHANA ONLY

DONE FOR TODAY

GOOD LUCK

🙌🙌🙌🙌🙌🙌🙌🙌🙌


(1ai)

 

TABULATE

 

– TEST: Specimen B + 2drops of iodine solution

 

– *OBSERVATION*: No precipitate is found (No reaction is occurring)

 

INFERENCE: It indicates specimen B contains no starch content

 

(1aii)

TABULATE

 

– TEST: Specimen B + 2ml of NaOH(aq) + 3 drops of CuSO4 + shake

 

– OBSERVATION: The mixture will turn to purple or violet colour

 

– *INFERENCE*: Protein is present

 

 

(1b)

(i) Test for starch

(ii) Test for protein (Biurets test)

 

(1c)

– Additional income is obtained through quality mushrooms

– They contain vitamins and proteins and Laos acts as antioxidants supporting the immune system

 

(1di)

Fungi

 

(1dii)

– Eukaryotic organism

– Absence of chlorophyll

– Cell walls made of chitin instead of cellulose

 

(1diii)

– Molds

– Mildews

– Smuts

– Rusts

– Yeast

 

(1ei)

Mullosca

 

(1eii)

– Presence of tentacles

– Possession of soft and unsegmented bodies

– Body is covered by a mantle and she’ll

– They are bilaterally symmetrical

– They are triploblastic with three layers

 

(1fi)

– Specimen C (mushrooms) are decomposers breaking down surface waste releasing nitrogen back into the soil in form of ammonium nitrate, a nutrient essential for plant survival

 

(1fii)

Saprophytic mode of nutrition

 

==================

(2a)

E – Berry

F – Berry

H – Dry Dehiscent Fruits

 

(2b)

E – Parietal placentation

F – Axile placentation

 

(2c)

E – Animals

F – Animals

H – Self dispersal

 

(2di)

Birds, squirrels, and other small mammals consumes the fruit which will lead to dispersal of the seeds in faeces or as they carry them from the tree to their habitats

 

(2dii)

(i) Vitamin such as vitamin C

(ii) Mineral such as Potassium, magnesium, iron

 

(2ei)

Green

 

(2eii)

It signifies that the pod is young and immature

 

(2fi)

Marginal placentation

 

(2fii)

DRAWING

 

 

3ai)

Phylum: Arthropoda

 

3aii)

Class: Insecta


Use this number (4)

👇🏼

 

(4a)

*TABULATE*

 

*- Specimen P-*

– Test: 2 drops of specimen P in water

– Observation time(seconds): 3-4 seconds before it dissolves

– Medium of spread: Water

– Sense organ: Eye

 

*-Specimen Q-*

– Test: Teaspoon of specimen Q + water

– Observation time(seconds): Dissolves within 65 seconds

– Medium of spread: Water

– Sense organ: Eye

 

*-Specimen R-*

– Test: Cut section of *specimen R*

– Observation time(seconds): 2 seconds or almost immediately

– Medium of spread: Air

– Sense organ: Nose

 

 

(4b) 

The biological Phenomenon that occurred is Diffusion 

 

(4ci) 

– Stiring 

– Heating 

 

(4cii) 

– Shaking 

– Stiring 

 

(4ciii) 

– Size of medium 

– Wind

 

(4di) 

(View image) 

 

(4dii) 

Use either loops, whorls or arches

 

(diii) 

Accidental, double loop, tented arch fingerprint

 

(4div) 

(a) Its highly accurate

(b) Very useful in criminal identification

(c) It is easy to use 

(d) It is unique and can never be the same for two people

 

(4dv) 

Morphological variation

(4dii) 

Use either loops, whorls or arches

 

(diii) 

Accidental, double loop, tented arch fingerprint

 

(4div) 

(i) Its highly accurate

(ii) Very useful in criminal identification

(iii) It is easy to use 

(iv) It is unique and can never be the same for two people

 

(4dv) 

Morphological variation


GOOD LUCK


 

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