2012 NABTEB BIOLOGY THEORY QUESTIONS AND ANSWER EXPO

Filed in Uncategorized by on May 30, 2012

ANSWER FOUR QUESTIONS.

1 (a) draw a labelled diagram (10-12cm) of microscopic appearance of hydra.

(bi) state TWO functions of the tentacle.

(ii) mention TWO importance of biology to man.

(c) list FOUR components of cell and ONE function of each.

2. (ai) define flowing plants.

(ii) give FOUR characteristics of an
underground stem.

(b) explain how perennials are able to persist and renew
vegitative growth.

(c) state FOUR importance of transpiration to plants.

3. (ai) list FOUR soil organisms.

(ii) mention two uses of soil organisms with one example.

(Bi) state FOUR forms of soil erosion.

(ii) give FOUR factors that determine the water retaining capacity of soil.

4.(ai) State FOUR characteristic features of pisces.

(ii) mention TWO major differences between oviparous and ovoviviparous fishes.

(Bi) list TWO dental diseases and their prevention.

(ii) name TWO skeletal materials and where
they are found.

(c) name the mode of nutrition in the following animals:

lizard,
bird,
grasshopper,
rat

5. (ai) give FOUR diffrences between arteries and veins in
tabular form.

(ii) what is the name of the space in which the heart lies?

(bi) list TWO 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 components of the
nervous system.

6.(ai) define sex linked genes.

(ii) state FOUR applications of genetics in health.

(b) list the mode of transmission, symptoms, causative organism and control
of syphills, tuberculosis and
acquired immune deficiency syndrome.

(ci) give TWO sources of food poisoning.

(ii) state TWO ways of preventing food poisoning.

NABTEB BIOLOGY ANSWERS.

1ai………

aii (i)it is use for feeling or hold things

(ii)it is used 4 moving or getting food

(bii) it help man 2 know d importance of d food we are eating and type of food will
should eat wich provide d essential nutrients our body
need 4 development

(ii) ………..

(1ci)component of cell are:

i] cell wall

ii] cell membrane

iii] endoplasmic reticula for nucleus.

FUNCTIONS.

( i) it provides support and shap to d cel.

(ii) it regulats d passage of materials in and out of d cell.

(iii) it responsible 4 d transportation of materials 4rm 1 part of d cell to another.

(iv).it controls all life
activity of d cell.

2ai) plants which have stamens and pistils, and produce true seeds; phenogamous plants; – distinguished from flowerless plants.

ii) i] Bulb :- – Short, upright organ used by plants for food storage or reproduction, with specialized leaves modified into thick flesh scales. Tulips and Lilies.

ii] Corm :- 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. Iris.

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.

2b) [i] 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.

2c)[ i] 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

[iii] It is controlling photosynthesis (most importantly for exchange of oxygen and carbon dioxide).

[Iv] Transpiration is beneficial for maintaining the plant temperature and keeping the plants cool in hot conditions.

3a)[ i] Protozoas :- Small single cell
microbes that feed on bacteria.

[ii] Actinomycetes :- Necessary for the breakdown of certain
components in organic matter.

[iii] Algae :- 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.

[V] Fungi :- The largest microbe group in terms of mass.

NABTEB BIOLOGY OBJECTIVE.

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