Tuesday, 8 May 2012

NABTEB BIOLOGY PRATICAL QUESTIONS AND ANSWERS-2012

Nabteb 2012 practical biology questions and answers
QUESTIONS TO SECTION A
(i. Give one example of.
(a. carnivorous animal.
(b. insectivorous animal
(ii. What is the ultimate source of energy in the biosphere
(iii. list 3 conservable of natural resources
(iv. state 2 ways by which water could be poluted
(v. define the following ecological terms.
(a. comunities.
(b. ecosystem
(vi. name d protozoan dat causes malaria
(vii. name one plant in the class of bryophyta
(viii. what is imcomplete metamorphosis
(ix. state 2 functions of the mammalian skin
(x. list 4 excretory product inplant.
.(xi. list 4 instrument commonly used to measure the rate of transpiration in plant
(xii. state d dental formula of a dog
(xiii. what name is given to d largest artery in man
(xiv. name d type of germination in .
(a. cowpea seed
(b. maize grain
(xv. where does absorption of digested food take place in man.
ANSWERS TO SECTION A
(1) i (a) fish
(b) bladderwort
(ii) sunlight
(iii) dangerous depletion of non-renewable resourses, renewable resourses being used up faster than they can be formed, pollution of environment.
(iv) crude oil and agriculture wastes
(v) a. community:- Is made up of all the populations of living organisms that exist together in a habitat .
b. Ecosystem:- Is a basic function unit of nature. it is made up of living environment.
(vi) plasmodium sp.
(vii)liverworts
(viii) incomplete metamorphosis - Is the gradual growth and development during an insect life cycle.
(ix) Temperature control and sensitivity
(x) carbondioxide, oxygen, water,tannins.
(xi) Potometer
(xii) dental formular of a dog (xiii) oxygenated blood
(xiv)a. compea seed --- epigeal germination b. maize grain ---- hypogeal germination
(xv) mouth
(2) a. Specimen A-
Earthworm B-
Cockroach
C- SoldierTermite b.
Specimen A
In damp soil, mud and moist soil B. In dark corners, cupboards, dirty toilet C- In plants c.
Specimen A. It burrows the soil to make it easy from growth of roots.
B. Destroy books, clothes, and food.
C. Destructions of crops/ plants.
d. Draw a dorsal view of specimen B.
 
ANSWERS TO SECTION C.
A Specimen D. Bean Seed Specimen
E. Coconut Fruit Specimen F- Mango Fruit.
b. Class of Fruit
E. Aggregate,
F. Drupe, c. Agent of dispersal,
D. Explosive mechanism ,
E. Water,
F. Animal. d
SPECIMEN E= i. Presence of Embryo,
ii. Absence of Seed.
Specimen F:
i. Absence of Embryo,
ii. Presence of seed.
4. Specimen G- Spisogyra,
H. Garden Snail,
I. Crayfish
J. Tilapia fish


QUESTIONS TO SECTION B
1a. identify specimen A,B and C without reason
1b. where is each specimen found
1c. state one economic importance of each specimen
1d. drawn and labbeled fully d dorsal view of specime B(6 to 8cm long)
 
2a. identify specime D, E and F without reason
2b. To what classes of fruit does each of specimen E and F belong
2c. state one agent of disperser of each of specime D,E and F
2d. state two observable differences betwen d internal feature of E and F

3a. identify specinme G,H.i and J without reason
3b. Name one habitant each of specimen G, H, I and J
3c. what type of skeletor is present in specimen I and J
3d. state one economic importantof specimen H

4a. differentiate between monohybride and dihybride crop
4b. define the following ecological term
(i)ecosystem
(ii) tropic level
(iii)succession
4c. A terrestrial environment above the following organism,snake, green grass,toad and grasshoper
(i) construct a simple food chain making use of the animals above
(ii) what is the ecological implication of killing all available snake in the environment.
 

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