2021 NABTEB GCE Biology Practical Answers [16th November]

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NABTEB NOV/DEC GCE 2021 FREE BIOLOGY PRACTICAL (BIO) QUESTION AND ANSWER ROOM

Tuesday 16th November, 2021
Alternative to Biology Practical (9:00am-11:00am)

NABTEB NOV/DEC GCE BIOLOGY PRACTICAL ANSWERS 2021:

A. O'LEVEL CANDIDATES

(1a)
(i) Water
(ii) Light
(iii) Temperature
(iv) Oxygen

(1b)
(i) It helps to maintain a sense of balance
(ii) It is an organ which facilitates hearing

(1c)
(i) It helps in removing waste materials, such as carbon dioxide, urea, and lactic acid
(ii) It helps in absorption of digested part of the food and transports it to all cells of the body.
(iii) It helps in transportation of oxygen from lungs to cells and transportation of carbon dioxide produced by cells to lungs.
(iv) It plays a major role in transportation of excreta such as uric acid, urea etc. to the kidney.

(1d)
(i) It contains chloroplasts in its cytoplasm
(ii) It does not have cell wall and acts as an heterotroph in the dark

(1e)
The embryo gets nourishment inside the mother's body by a disc-like tissue placenta which gets developed between the uterus well and the embryo during the implantation. The nutrients, Oxygen and waste products are exchanged through this tissue.

(1f)
(i) AS
(ii) AC

(1g)
(i) Overgrazing
(ii) Deforestation
(iii) Bush burning
(iv) Wind

(1h)
(i) Salting
(ii) Smoking
(iii) Freezing
(iv) Drying

(1i)
XY chromosomes

(1j)
(i) Fats and oil
(ii) Proteins
(iii) Carbohydrates
(iv) Vitamins

(1k)
Kwashiorkor

(1l)
(i) Bacteria
(ii) Viruses

(1m)
Secchi disc

(1n)
ARTERIES:
(i) Arteries carry oxygenated blood expect pulmonary artery
(ii) Arteries have thick elastic muscular walls

VEIN:
(i) Veins carry deoxygenated blood except pulmonary vein.
(ii) Veins have thin non-elastic less muscular walls.

(1o)
World Health Organisation

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(2a)
(i) Clay soil - C
(ii) Sandy soil - A
(iii) Loamy soil - B

(2bi)
(i) Sandy soil has poor water holding capacity with low nutrition value whereas loamy soil has good water holding capacity with the necessary nutrients for proper growth of the plant
(ii) Sandy soil is a poor type of soil for agricultural use whereas loamy soil is best for the growth of plants.

(2bii)
Complete the table:
X = 20
Y = 30
Z = 40

What are the values of:
X = (60-40)ml = 20ml
Y = (60-30)ml = 30ml
Z = (60-20)ml = 40ml

(2c)
(Pick Any FOUR)
(i) Conservation tillage
(ii) Crop rotation
(iii) Cover crops
(iv) Buffer strips
(v) Contour Farming
(vi) Strip Cropping
(vii) Windbreaks

(2d)
- Nitrogen
- Carbon
- Sulfur
- Phosphorus
- Organic matter

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(3ai)
Paramecium

(3aii)
Oligohymenophorea

(3aiii)
1 - Cilia
2 - Anterior contractile vacuole
3 - Micronucleus
4 - Macronucleus
5 - Oral groove
6 - Cytostome(cell mouth)
7 - Gullet
8 - Food vacoule
9 - Anal pore(cytoproct)
10 - Posterior contractile vacuole

(3bi)
Nucleus

(3bii)
Oesophagus

(3biii)
- Vorticella
- Tetrahymena

(3biv)
Freshwater

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(4a)
(i) 3
(ii) 1
(iii) 3:1
(iv) 1:2:1

(4b)
(i) Dominant gene is a gene which controls dominant characters
(ii) Recessive gene is a gene which controls recessive characters

(4ci)
Mendel's first law states that genes are responsible for the development of the individual and that they are independently transmitted from one generation to another without undergoing any alteration.

(4cii)
(i) Interphase
(ii) Metaphase
(iii) Telophase
(iv) Prophase
(v) Anaphase


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(5a)
TABULATE:

-Rain gauge | Rainfall
-Barometer | Atmospheric temperature
-Anemometers | Wind speed
-Thermometer | Temperature
-Secchi disc | Turbidity

(5bi)
(i) Light intensity
(ii) Moisture levels
(iii) Soil pH
(iv) Wind intensity

(5bii)
Habitat is an ecological or environmental area that is inhabited by a particular species of animal, plant, or other type of organism.

(5c)
(i) Quadrat: It is used to estimate populations of plants or to sample within an ecosystem.
(ii) Sweep net: It is used to catch flying insects
(iii) Pooter: It is used to catch invertebrates directly from leaves
(iv) Dragnet: It is used for catching fish 

 

B. ADVANCED LEVEL CANDIDATES

(1ai)
A - root system

(1aii)
In the roots, xylem and phloem are in the centre to withstand stretching forces

(1b)
a - Cortex 
b - xylem
c - epidermis
d - sclerenchyma
e - phloem
f - xylem
g - pitch 
h - root hair

(1c)
(i) d(sclerenchyma); It provides mechanical support to the plant
(ii) e(phloem); It transports sucrose and amino acids between the leaves and other parts of the plant.
(iii) f(xylem); It transports water and mineral salts from the roots up to other parts of the plant
(iv) h(root hair); It absorbs water and nutrients from the rhizosphere

(1d)
(i) Stomata transpiration
(ii) Lenticular transpiration

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(2)
GRAPH WORK

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(3a)
a - left kidney
b - left ureter
c - left fallopian tube
d - left Ovary 
e - uterus
f - urinary bladder
g - cervix 
h - vaginal

(3b)
c - Fertilization takes place inside the fallopian tube
d - Produce and release mature eggs
e - Implantation of the fertilized egg
f - It stores urine allowing urination to be infrequent and controlled
g - It facilitates the passage of sperm into the uterine cavity

(3c)
(i) Ovulation disorders
(ii) Uterine or cervical abnormalities
(iii) Fallopian tube damage or blockage
(iv) Endometriosis

(3d) 
(i) Hormonal contraception - pills
(ii) barrier methods - condoms
(iii) permanent contraception - vasectomy and tubal ligation
(iv) long-acting reversible contraception -  the implant or intra uterine device (IUD)

(3e)
(i) Copulation: It is a  reproductive act in which the male reproductive organ (in humans and other higher animals) enters the female reproductive tract for the purpose of sexual pleasure, reproduction or both.
(ii) Zygote: It is the first diploid cell that is formed by the fusion of male and female gametes during Fertilization resulting in the formation of an embryo.
(iii) Orgasm: It is a climactic physiological state of heightened sexual excitement and gratification that is followed by relaxation of sexual tensions and the body’s muscles. Orgasm normally accompanies male ejaculation as a result of sexual stimulation, and it also occurs in females as a result of sexual stimulation.
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(4a)
(i) Mollusca
(ii) Pteridophyta
(iii) cnidarians 
(iv) Amphibians

(4b)
(i) Mollusca; Snail
(ii) Pteridophyta; ferns
(iii) Cnidarians; jelly fish
(iv) Amphibians: Frog

(4c)
Animal diseases caused by virus
(i) Monkeypox
(ii) Newcastle disease

Plant diseases caused by virus
(i) Brome mosaic virus
(ii) Plum pox virus

(4d)
(i) They are used in the production of fermented foods and beverages
(ii) They are used to produce biofuel like biodiesel
(iii) The replenish the soil
(iv) They are useful in the production of antibiotics and vaccines
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