NECO Biology 2020 Objective and Theory Questions and Answers – Latest Updates.
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The National Examinations Council is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and December/January respectively.
NECO Biology Question and Answers
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100% VERIFIED BIOLOGY OBJ:
1ai) Morphological variation refers to the noticeable physical appearance of individual of the same species . for example in human beings morphological variation include, height of the body , shape of the body etc.
1aii)Pollination: The transfer of pollen from the anthers of a flower to the stigma of the same flower or of another flower.
1aiii)niche:is a term that is used in ecological biology to define an organism’s
role in an ecosystem.
—Both processes release energy
—-. Both start with the breakdown of a
—–. Both yield byproducts
—– Rapid population growth
——- cost of fertiliser and transport
—Embryo with two cotyledons
—– Flower parts in multiples of four
—- Roots develop from radicle
—- Pollen with three furrows or
Do it in a tabular form
1) oxygen is required in aerobic while oxygen is not required in anaerobic
2) in aerobic More energy is required while in anaerobic less energy is required
1bi)both aerobic and anearobic respiration lead to the loss of energy
Ii) Both occur in plants and animal cell
Iii) Both processes require enzymes to speed up the reactions
1biii) 1 draught, 2)overpopulation 3)flood 4) pests 5) poor storage facilities
1c) Ecological Niche refers to the specific portion of a habitat which is occupied by a particular species or organism
i)nutrition is the act of feeding of animals
ii) mutation is the splitting of a cell into simpler ones which have the same characters and features of the bigger ones
3iii) Gene are hereditary units or basic units of inheritance. They are located in chromosomes and are responsible for the transmission of character from parents to the offspring
3bi) The light rays from the object pass through the conjuctiva, cornea, aqueous humour, lens and vitreous humour in that order. All these structures refract the light such that it falls on the retina. This is called focussing. Maximum
focussing is done by the cornea and the lens. The light then falls on the retina. This light is received by the hotoreceptors – rods and cones, on the retina. The absorbed light activates the pigments present in the rods and
cones. The pigments are present on the membranes of the vesicles. Thus, the light is then converted into action potentials in the membranes of the vesicles. These travel as nervous impulses through the rod or the cone cell and reach the synaptic knobs. From here the impulses are transmitted to the bipolar nerve cells, then to the ganglions and then to the optic nerves. Thus the nervous impulses generated in the retina are carried to the brain by about a
million neurons of the optic nerve. The vision is controlled by the occipital lobe at the back of the brain. The information received is processed and we are able to see the image. The image formed on the retina is inverted. however, the brain makes us see the image erect. So, though the eyes are essential for vision, any damage to
the optic nerves also results in impairment of
3bii) difference between between amoeba and euglena
Amoeba: Heterotroph by phagocytosis
Euglena: Autotroph by photosynthesis and
heterotroph by ingestion
-They can move
-They respond to stimulus
-Most do not move
-They do not reproduce
-They do not grow
-They do not respond to stimulus
-They do not excrete
-Large cylindrical centrum
-Large neural canal
-Short tranverse process
-Long neural spine
DRAW THE DIAGRAM
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