*2020 NABTEB Biology Answers*
INSTRUCTIONS: Answer four questions in all
NUMBER 1⃣2⃣5⃣6⃣ SOLVED
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Nuclous :- It Controls all life activities of the cell.
Chloroplast:- It contain chlorophyll which aid photosythesis in green plants.
(i) Cell is defined as the smallest unit of living organism. It is the first level of organization of life. All plants and animals are made up of cells some of these plants and animals are made of only one cell hence, they are called unicellular organism while others are made up of many cells are therefore called multicellular organism.
- Examples of unicellular organisms are Amoeba, paramecium,Euglena.
- Examples of multicellular organisms are Amphibian and mammals.
(ii) Tissue:- Is a group of similar cells forming a layer in an organism which performs a particular function.
- Example of tissue in higher plants are mesophyII layers in leave, Epidermal tissue, Sclerenchyma tissue, Xylem tissue, Parenchyma tissues in stem.
- Examples of tissue in higher animals include Muscle, Bone, Cartilages and blood.
- Examples of organisms which exist at the tissue levels are: Sponges, Algae, Hydra and fungi.
Osmosis help plasma membrane to regulates the movement of materials between the cells and its environment.
Diffusion help mitochondria in Maintaining gaseous exchange in the cell.
Growth is defined as an irreversible increase in size or weight of an organism due to the addition of living proton plasmic materials.
(i) Availability of nutrients.
Germination is defined as the process which involves the gradual development of the embryo of the seed into a seedling or young plant.
(i) Testa Splits
(ii) Cotyledon is the first photosynthesis tissue.
(iii) Energy obtained from food is stored in the Cotyledon.
(i) Pericarp Splits.
(ii) Foilage leaves is the first photosynthesis tissue.
(iii) Energy obtained from food is stored in the endosperm
Metamorphosis is defined as the series of gradual changes of formed and shape of an insect from the fertiled egg(Matured egg) to adult(mature stage of adult hood).
(i) Complete metamorphosis .
(ii) Incomplete metamorphosis.
(i) Buttery and bees.
(ii) Cockroach and Dragonfly.
(i) They show distinct castes.
(ii) They live together in colony.
(iii) They show division of Labour.
(iv) Members communicate with one another within the colonies.
(i) The clay obtained from Anthill is used to build the surface of tennis court.
(ii) They produce a good source of protein and fats.
(iii) They help to pollinate flower.
(i) Charles Dawin.
(ii) Jean Baptist de lamar.
(i) Fossil records.
(ii) Evidence from comparative anatomy.
(iii) Evidence from Embryology.
(iv) Evidence from geographical distribution.
(i) There is presence of prehensile tails(eg monkey).
(ii) They have opposable digits eg monkey.
(iii) They possess grasping scales e.g Snakes.
(iv) They have grasping pads e.g tree frogs.
(i) It helps to maintain the body temperature of organisms.
(ii) It is essential for plant mechanical supports.
(iii) It provides moisture necessary for microbial activity.
(iv) It is also essential for translocation and transpiration.
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2021 EXAM DATES
NABTEB: 14th June - 9th July
NECO: 5th July - 16th August
WAEC: 16th August - 30th Sept