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Below is the Nabteb 2012 biology expo.
ANSWER FOUR QUESTIONS FROM THE QUESTIONS BELOW.
1a.) Draw a labelled diagram (10-12cm) of microscopic appearance of hydra.
bi.) state 2, two functions of the tentacle.
ii.)Mention two (2) importance of biology to man.
c.)List four (4) components of cell and ONE function of each.
2.ai.) define flowing plants.
aii) give FOUR characteristics of an underground stem.
b.) Explain how perennials are able to persist and renew vegitative growth.
c.) state four (4) importance of transpirationto plants.
3ai.) list four (4) soil organisms.
ii.) mention two uses of soil organisms with one example.
Bi.) state four (4) forms of soil erosion.
(ii) give FOUR factors that determine the water retaining capacity of soil.
4ai) State four (4) characteristic features of pisces.
ii.) Mention two (2) major differences between oviparous and ovoviviparous fishes.
Bi.) list two (2) dental diseases and their prevention.
ii.) Name two (2) skeletal materials and where they are found.
(c) name the mode of nutrition in the following animals:
5ai.) give four (4) diffrences between arteries and veins in tabular form.
ii.) What is the name of the space in which the heart lies?
5bi.) List two (2) types of circulatory systems.
ii.) state two conditions that make amphibians to use their skin for respiration.
ci) Mention the excretory products of kidney and skin.
ii.) list three (3) components of the nervous system.
6ai.) define sex linked genes.
(ii) state four (4) applications of genetics in health.
6b) list the mode of transmission, symptoms, causative organism and control of syphills, tuberculosis and acquired immune deficiency syndrome.
6ci) give two (2) sources of food poisoning.
ii) state two (2) ways of preventing food poisoning.
The 2012 NABTEB BIOLOGY Answers For the Above Questions.
aii) It is use for feeling or hold things.
ii.) It is used for moving or getting food.
bii.) It help man two know the importance of the food we are eating and type of food will should eat wich provide d essential nutrients our body which is needed for our development.
1ci.) Component of cell are:
i.) cell wall
ii.) cell membrane
iii.) endoplasmic reticula for nucleus.
i.) it provides support and shap to d cell.
ii.) It regulates the passage of materials in and out of the cell.
iii.) it responsible for the transportation of materials from one part of the cell to another.
iv.) it controls all life activity of the cell.
2ai.) plants which have stamens and pistils, and produce true seeds; phenogamous plants, distinguished from flowerless plants.
Short, upright organ used by plants for food storage or reproduction, with specialized leaves modified into thickflesh scales.
Tulips and Lilies.
Short, upright, hard or fleshy stems covered with thin, dry papery leaves.
iii.) Rhizome –> With reduced scale like leaves.
The top can generate leafy stems while the bottom can produce roots.
iv.) Stolon –> Horizontal stems that run at or just below the soil surface with nodes that root and long internodes, the ends produce new plants.
When above ground they are called runners
V.) Tuber –>
An enlarged fleshy end of a stem, generally from rhizomes but often also referring to thickened roots too.
The vegetative stage –>
These leafy plants have a large amount of digestible cell contents, and a high feed value.
ii.) Elongation/transition stage –>
Leading to the Reproductive Stage –>
This is influenced by the longer daylight hours and warmer temperatures.
iii.) Flowering/reproductive stage –>
A flower emerges from within the top leaf sheath (the flag leaf).
A seed head then develops.
Botanical studies have found that transpiration is important for survival of the plant.
(ii.) It is crucial for uptake of nutrients from the soil medium.
It is controlling photosynthesis (most importantly for exchange of oxygen and carbon dioxide).
Transpiration is beneficial for maintaining the plant temperature and keeping the plants cool in hot conditions and weather.
Small single cell microbes that feed on bacteria.
(ii) Actinomycetes –>
Necessary for the breakdown of certain components in organic matter.
Beneficial groups such as blue-green algae, yellow-green algae and diatoms.
(Iv) Bacteria –>
Small, single cell organisms that make up the single most abundant type of microbe.
The largest microbe group in terms of mass.
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