2021 NABTEB GCE Biology Practical Answers : 2021 NABTEB GCE Biology Practical Answers Night before Exam

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(1i)
- Fertilization

(1ii)
[pick any two]
(a): The presence of hair or fur.
(b): Sweat glands.
(c): Glands specialized to produce milk, known as mammary glands.
(d): Three middle ear bones.

(1iii)
- 280 days, or 40 weeks,

(1iv)
- calyx

(1v)
[Pick any two]
(a): auxin.
(b):abscisic acid
(c): ethylene
(d): gibberellins
(e): cytokinins,

(1vi)
(a) iron
(b) magnesium

(1vii)
[Pick any two]
(a): Crocodilians
(b): Snakes
(c): amphisbaenians
(d): lizards

(1viii)
When controlled by a particular allele of a gene and which will only be displayed when the individual is homozygous for this allele.

(1ix)
- O negative blood

(1x)
(a): anemometer is an instrument that measures wind speed and wind pressure.
(b): pooter is used in ecology for collection of insects.

(1xi)
[Pick any four]
(a): Mid- brain
(b): Occipital lobe
(c): Temporal lobe
(d): Parietal lobe
(e): Frontal lobe
(f): Cerebral cortex
(g): Cerebellum

(1xii)
- Hemoglobin (Heme + Globin)

(1xiii)
[Pick any two]
(a): Bile production and excretion.
(b): Excretion of bilirubin, cholesterol, hormones, and drugs.
(c): Metabolism of fats, proteins, and carbohydrates.
Enzyme activation.
(d) Storage of glycogen, vitamins, and minerals.

(1xiv)
- Commensalism

(1xv)
[Pick any two]
(a) grasshoppers
(b) cicadas
(c) cockroaches
(d) Lice.


2021 NABTEB GCE Biology Practical Answers (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NABTEB GCE Biology Practical Answers (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NABTEB GCE Biology Practical Answers (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NABTEB GCE Biology Practical Answers (ESSAY, OBJ, THEORY, PRACTICALS ETC)

2021 NABTEB GCE Biology Practical Answers (ESSAY, OBJ, THEORY, PRACTICALS ETC)
=

(2a)

- TEST
(ai) To a piece of yam iodine solution was added

- OBSERVATION
(ai) The colour will change to blue black

- INFERENCE
(ai) Starch is present

(2aii)
- TEST
(aii) To a small quantity maltose in a test tube was added Benedict solution , the mixture was boiled for 4-6 minutes

- OBSERVATION
(aii) A brick red precipitate is seen

- INTERFERENCE
(aii) Glucose is present

(2aiii)
-TEST
(aiii) To small quantity of egg white was added 3cm³ of million regent , the mixture was warmed in a water bath for few minutes

- OBSERVATION
(aiii) A red precipitate would appear

- INTERFERENCE
(aiii) Protein is present

(2aiv)
- TEST
(aiv) A few drops of Sudan (III) was added to oil in a test tube and then boiled

- OBSERVATION
(aiv) A red coloration appeared before boiling. A black precipitate was observed on boiling

- INTERFERENCE
(aiv) Fat & Oil is present


(2b)
(i) Starch — yam, rice
(ii) Lipid — palm oil , groundnut
(iii) Protein — Milk , cheese
(iv) Vitamins — Soya beans , palm wine..

SECTION B

(3a)
(i): Contractile Vacuole
(ii): Cilium
(iii): Maganucleus
(iv): Micronucleus
(v): Oral grove
(vi): Anal pore
(vii): Contractile Vacuole

(3b)
- Paramecium

(3bi)
- Aquatic habitats

(3bii)
- it is formed or have aquatic environment usually in straight warm water

(3biii)
-Protozoa

(3biv)
- Amoeba
-Plasmoduim

(3c)
(i) Oral grove : helps to direct food to the mouth..

(ii) Anal pore : where waste is ejected after the nutrients from food have been absorbed into

(iii) Contractile Vacuole: gets rid of excess water...

SECTION B

(4a)
[TABULATE]

(i)
Ecological Instrument
- Rain gauge

Ecological Factor Measured
- Precipitating rain

(ii)
Ecological Instrument
- Anemometers

Ecological Factor Measured
- Wind Speed

(iii)
Ecological Instrument
- Nephelometric Turbidity Units

Ecological Factor Measured
- Turbidity or Transparency of water

(iv)
Ecological Instrument
-Barometer

Ecological Factor Measured
- Atmospheric pressure

(v)
Ecological Instrument
- Photometer

Ecological Factor Measured
- Strength of electromagnetic radiation


(4b)
(i) Diatoms —> Mosquito Larvae —> King fisher

(ii) Diatoms = Producer
(iii) Tertiary customer (King fisher)

(4c)
— They is a tendency of over crowding in the ecosystem due to the fact that there is possibility of decrease in death rate as a result of tertiary consumer (king fisher) from the environment...


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2021 EXAM DATES
NABTEB: 14th June - 9th July
NECO: 5th July - 16th August
WAEC: 16th August - 30th Sept


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QUESTIONS AND ANSWERS FOR 2021 NABTEB GCE Biology Practical Answers


EXAM DETAILS:


PIN: 9688
Subject: Biology
Exam: NABTEB GCE
Year: 2021
Updated At: June 16th 2021, (02:06:58)

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