Author Topic: NABTEB 2022 BIOLOGY ANSWERS (ESSAY & OBJ) (Read 106 times)

MANDINHO · « **on:** June 21, 2022, 04:49:05 pm »

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MANDINHO · « **Reply #1 on:** June 22, 2022, 02:35:41 pm »

NABTEB 2022 BIOLOGY THEORY ANSWERS

INSTRUCTION: ANSWER 4 QUESTIONS ONLY, AT LEAST ONE FROM EACH SECTION

PART I

(1a)
(i)It explain changes in human body
(ii)It helps in the formation of professional careers
(iii)Provide answers to large scale problems
(iv)It gives rise to new scientific investigation
(v)The industries of silk,pearl,ivory,fishing etc have been developed with new technology due to the knowledge received from biology

(1b)
=ADVANTAGES=
(i) It leads to mutual interdependence between component cells or division of labour by component cells which leads to efficiency and increase in size
(ii) It increases adaptation to environment.
(iii) It leads to mutual interdependence between component cells or division of labour by component cells which leads to efficiency and increase in size.

=DISADVANTAGES=
(i) It leads to slower rate of expulsion of waste products from the cells
(ii) It leads to slower rate of diffusion of oxygen or other respiratory gas in higher organisms.

(1c)
(i) Mammals: Organ system
(ii) Hydra: Tissue
(iii) Amoeba: Cell
(iv) Leaf: Organ
(v) Ear: Organ

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PART II

(2a)
(i) Carbondioxide
(ii) Present of chlorophyll
(iii) Water
(iv) Sunlight
(v) Temperature

(2b)
(i) They are usually small and are of dull colours.
(ii) They generally have long anthers protruding out of the flowers so that pollen may get blown off easily.
(iii) Pollen grains are small, smooth, light and they are not sticky to enable wind to be able to transport them to the next flower available
(iv) The stigma of a wind-pollinated flower is elongated and sticky with large surface area
(v) Large quantities of pollen grains are produced

(2ci)
TABULATE

=TROPIC MOVEMENT=
(i) It is a growth movement
(ii) Response to unilateral stimulus
(iii) Slow response
(iv) Not reversible
(v) Not due to cell tugor
(vi) Directional/positive /negative response

=NASTIC MOVEMENT=
(i) Not a growth movement
(ii) Response to diffuse stimulus
(iii) Fast response
(iv) Reversible
(v) Due to changes in cell tugor
(vi) Positive nor negative response

(2cii)
Tactic movement is a movement of an entire plants or whole organism which is directed towards (positive) or away from (negative) a stimulus.
Example: The blooming of sunflower under the influence of the intensity of light. Movement of Chlamydomonas towards light
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(3ai)
Macronutrients are nutrients that provide calories or energy and are required in large amounts to maintain body functions and carry out the activities of daily life.

(3aii)
Micronutrients are nutrients that are required by the body in lesser amounts for its growth and development. They play a major role in the metabolic activities of the body

(3bi)
Macronutrients: Nitrogen, potassium

(3bii)
Micronutrients: Calcium, Zinc

(3ci)
Soil conservation is the prevention of soil loss from erosion or decreased fertility caused by acidification, over usage, salinisation or other chemical soil contamination.

(3cii)
- Contour farming
- Afforestation
- Crop Rotation
- Strip Cropping
- Checking Overgrazing

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PART III

(4a)
Diagram

(4b)
(i) Endoskeleton: Named vertebrate/Man/Fish/Lizard

(ii) Hydrostatic skeleton: Leeches/earthworm/hookworm

(iii) Exoskeleton: Named arthropods/insects/snail/crab

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(5a)
Balanced diet is a diet consisting of adequate amounts of all the necessary nutrients recommended for healthy growth and for efficient daily activities and functions.

(5b)
=CLASSES OF FOOD=
(i) Carbohydrates
(ii) Fat and oil
(iii) Protein
(iv) Vitamins
(v) Mineral
(vi) Water

=IMPORTANCE TO HUMAN DIET=
(i) Vitamins: Vitamin C is necessary for the synthesis of collagen, which provides structure to blood vessels, bone and ligaments.
(ii) Water: Water helps to maintain homeostasis in the body and transports nutrients to cells.

(5c)
(i) Ptyalin: Salivary gland
(ii) Pepsin: Gastric gland
(iii) Lipase: Pancreas
(iv) Amylase: Pancreas
(v) Renin: Gastric gland

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PART IV

(6ai)
Food chain is defined as a feeding relationship involving the transfer of energy through food from producers to consumers

(6aii)
A food web is defined as a complex feeding relationship among organisms in the same environment with two or more inter-related food chains

(6b)
II (Cowpea) –> IV (grasshopper) –> I (Lizard) –> III (Snake) –> V (Hawk)

(6c)
(i) Temperature
(ii) Relative humidity
(iii) Rainfall
(iv) Wind
(v) Light intensity
(vi) Soil moisture
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COMPLETED

MANDINHO · « **Reply #2 on:** June 22, 2022, 02:36:49 pm »

BIOLOGY OBJ
01-10: CCCABDCBBB
11-20: DBADCBCDDC
21-30: BCBACAABCB
31-40: DABCBBBCAD
41-50: ACACCBACCB

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