NABTEB Biology Questions & Answers – 2020 Expo

NABTEB Biology ANSWER OBJ & ESSAY – 2020 EXPO

Tuesday 22nd September 2020

Biology (Objective & Essay) 9.00am – 11:20am (2hrs 20mins)


 NABTEB BIOLOGY ANSWERS

BIOLOGY OBJ
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2020 NABTEB SSCE BIOLOGY THEORY

YOU ARE TO ANSWER FOUR QUESTIONS IN ALL

ONE FROM EACH SECTION(PART)

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PART I

(Number 1)

(1ai)
Diagram(Plant cell)

(1aii)
(Choose Any Two)
(i)Endoplasmic reticulum: it aids the transport of materials within the cytoplasm

(ii)Nucleous : it controls all the life activities of the cell. It store hereditary information as it contain DNA inside chromosomes which take part in cell division

(iii)Chloroplast : They contain chlorophyll which aid photosynthesis in green plants

(1b)
(i)Cells(First level): Cell is defined as the simplest, smallest and basic unit of living organisms. single cell organisms are called unicellular while organisms with many cells are called multicellular.Examples of unicellular organisms are Amoeba,chlamydomonas,Euglene etc. Example of multicellular organisms are volvox, Hydra,Spirogyra etc.

(ii) Tissue (Second level ): A 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 mesophyll tissue and muscle. Example of tissue in higher animal are Bone and cartilages. Example of tissue which exist between level of organization of life are
Hydra andAlgae

(1ci)
Osmosis:
Osmosis aim to equalize forces inside cells and organisms as a whole,spreading water,nutrients and necessary chemicals from areas that contain a high concentration to areas that contain a low concentration.

(1cii)
Diffusion:
All cells are enclosed by a cell membrane,which is selectively permeable. molecules can move into or out of cells by diffusion and active transport

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{PART II}

(Number 2)

(2a)
Growth is defined as an irreversible or permanent increase in size,dry mass or weight due to the addition of living protoplasmic materials in organism.

(2aii)
(Choose Any Five)
(i)Light
(ii)Oxygen
(iii)Carbon (iv)oxide
(iv)Water
(v)Temperature
(vi)Availability of nutrient

(2aiii)
(Choose Any Three)
(i)auxins
(ii)gibberellins
(iii)absisic acid
(iv)Cytokinins
(v)Dichlorophenoxy
(vi)Benzoic acid

(2bi)
Germination is defined as the process which involves the gradual development of the embryo of the seed into a seedling or a young plant. It is also a series of changes by which an embryo in a seed grows into seedling.

(2bii)
(In a Tabular form)

(under Hypogeal)
(Choose Any three)
(i)Energy obtained from food is stored in the endosperm
(ii)Foilage leaves are the first photosynthetic tissue
(iii)Hypocotyl covered by the sheat/coleorrhiza
(iv)Cotyledons remain in the soil

(under Epigeal)
(Choose Any three)
(i)Energy obtained from food is stored in the cotyledon
(ii)Cotyledon is the first photosynthetic tissue
(iii)Hypocotyl emerges uncovered
(iv)Cotyledons are carried above the soil

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{Part III}

(Number 5)

(5ai)
Metamorphosis can be defined as the series of gradual changes of formed and shape of an insect/organisms from the fertilized egg(immature stage) to adult (mature stage of adulthood).

OR

Metamorphosis is a series of gradual changes that occur in the development of animal /organisms from Zygote (fertilized egg) to adult age.

(5aii)
(i)Complete metamorphosis
(ii)Incomplete metamorphosis

(5aiii)
Example of organisms that undergo Compete metamorphosis are
(i)Housefly
(ii)butterfly

Examples of organisms that undergo Incomplete metamorphosis
(i)cockroaches
(ii)Termite

(5bi)
(i)Termites
(ii)Honey bees
(iii)Ants
(iv)Wasps

(5bii)

(i)They live together in nests or colonies
(ii)They show or display division of labour
(iii)They show distinct castes
(iv)Members communicate with one another within the colonies

(5bii)
(i) Many insects pollinate followers of plant crops thus resulting in high food production

(ii)They transmit di