NABTEB GCE 2018 BIOLOGY EXPO OBJ & ESSAY QUESTIONS And ANSWERS RUNZ – NOV/DEC EXPO

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NABTEB GCE 2018 BIOLOGY EXPO OBJ & ESSAY QUESTIONS And ANSWERS RUNZ – NOV/DEC EXPO

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BIOLOGY OBJ:
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(1ai)
Exosmosis is the process of a fluid through a semipermeable membrane toward a solution of lower concentration especially the passage of water through a cell membrane into the surrounding medium.
(1aii)
Plasmolysis is defined as the outward movement or flow of water from living cells when they are placed in a hypertonic solution

(1b)
In lower organisms, every cell in the body is close to the external environment. Their cells are kept moist and gases diffuse quickly through simple diffusion.

(1ci)
(i) Lungs
(ii) Nose
(iii) Gills
(iv) Trachea

(1cii)
Red blood cells will shrink in a hypertonic salt solution because the osmotic forces will cause water to leave the cell due to the higher osmolarity (concentration of solutes) of the surrounding fluid than the cytoplasm inside the blood cell.

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(2ai)
Pollination is the transfer of mature pollen grains from the anthers of one flower to the mature stigma of the same flower or another flower of the same plant or closely related species.

(2aii)
(i) Insect
(ii) Wind

(2bi)
A fruit is a mature fertilized ovary of a flower containing one or more seeds.

(2bii)
In a tabular form
Under fruit:
(i) Fruit develop from an ovary and so contain seed.
(ii) Fruit undergo a ripening process
Under seed
(i) Seed is develop from an ovule and so contains an embryo.
(ii) Seed do not undergo a ripening process

(2ci)
(i) It helps to prevent over crowding of plants.
(ii) It prevents undesirable competition for space, light, water and nutrients.

(2cii)
(i) Animals
(ii) Water
(iii) Gravity

(2ciii)
(i) Fruit or seeds are light, so they are easily carried by the wind from parent plants to other places.
(ii) Fruits or seeds are feathery
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(5ai)
A joint is a point or place or region where two or more bones meet or articulate.

(5aii)
(i) Ball and socket joint: The joint is found in the shoulder and the hip joint.
(ii) Hinge joint: The joint is found in the elbow and knee joint.

(5b)
Draw and label Diagram of a typical movable joint [8-10cm long]
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(6ai)
Variation is defined as the morphological and physiological difference which occur within a species which could be hereditary or acquired from the environment.

(6aii)
Competition is an interaction among organisms of the same or different species associated with the need for a common resource that occurs in a limited supply relative to demand

(6b)
(i) Height of a person.
(ii) Weight of a person.
(iii) Colour of hair

(6b)
(i) Ability to roll the tongue.
(ii) Ability to close one eye and keep the other open
(iii) Ability to move the ears without moving the head

(6ci)
(i) Thermometer
(ii) pH meter
(iii) Light meter

(6cii)
How a pH meter work:
A pH meter works like a voltmeter. It measures the voltage (electrical potential) produced by the solution whose acidity you are interested in, compares it with the voltage of a known solution, and uses the difference in voltage (the “potential difference”) between them to deduce the difference in pH.

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