BECE INTEGRATED SCIENCE .QUESTIONS@blackloaded

BECE INTEGRATED SCIENCE .QUESTIONS                                                                                                     
QUESTION 1

2017 BECE OBJ
1-10DCBAACBABA.         
11-20ADDBCADBCC.     
21-30AACBBDAACD         
3140BADCBBAACB                                                                   
Q1bi.Heredity is the process whereby certain characteristics or traits are passed on from parents to their
offsprings through genes.

ii.1. colour of the skin
2.blood group
3.Height
4.baldness

i. DIFFERENCES BETWEEN OSMOSIS & DIFFUSION

OSMOSIS DIFFUSION
1.it involves the movement of only water molecules 1.it involves the movment of any particle
2.it involves a semi permeable membrane 2.it does not involve a semi pemeable membrane
3.occurs in liquids only 3.occurs in both gases and liquids

SIMILARITIES BETWEEN OSMOSIS & DIFFUSION
1.Both processes involve a concentration gradient
2.Both processes involve movement of molecules

ii. DIFFUSION IN
PLANT ANIMALS
1.Plants absorbs some mineral salt by diffusion from 1.diffusion of hormones out of endocrine glands
the soil through roots hair stream

OSMOSIS IN
PLANT ANIMALS
1.the movement of water from the soil through the roots 1.the movement of into cytoplasm of amoeba
and stem to the leaves

i.photosynthesis is the process whereby green plants use energy from sunlight to manufacture their own food
CHEMICAL EQUATION :6CO2 + 6H2O—–C6H12O6+6O2

ii.photosynthesis make it possible for herbivores to live by feeding on green plants
ii.oxygen is released off as by product which animals breathe in for cellular respiration
iii.photosynthesis help to reduce the amount of carbon dioxide in the atmosphere

iii.SUNLIGHT
i it is the energy in the sunlight that the plant converts to make food
CHLOROPHYLL
ii.the chlorophyll absorbs the sunlight and processes to make food for the plant
CARBON DIOXIDE
iii.carbon dioxide is obtain from the air
WATER
iv.water dissolves mineral salt and transported from the soil to the leaves through the root and stem

TEXT FOR STARCH IN PLANT
1.pluck a leaf which has received enough sunlight
2.Boil the leaf in water for about five minutes to kill the living cells in the leaf
3.dip the leaf in warm alcohol to remove the green colouring matter in the leaf
4.dip it again in a cold water to wash away the alcohol
5.dip the leaf in boiling water for about three seconds to make it soft
6.finally place the leaf on a white porcelain plate and pour few drops of iodine solution on it

2a)
Fuse is an electrical safety device that can stop current from flowing if it becomes overloaded, or a device that is used to ignite an explosive device.

2aii)
fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the current. It is a sacrificial device and once a fuse has operated it is an open circuit, and it must be replaced or rewired, depending on type.

2bi)
parasitic plant is a plant that derives some or all of its nutritional requirements from another living plant .

Example
i)Obligate parasite – a parasite that cannot complete its life cycle without a host.
ii)Facultative parasite – a parasite that can complete its life cycle independent of a host.

Q3a) Acid is a substance with particular chemical
properties including turning litmus red,
neutralizing alkalis, and dissolving
some metals; typically, a corrosive or
sour-tasting liquid of this kind.

Q4a work input is work done on a
machine equal to the effort force times
the distance through which the force is
applied. (WO) work output is work that is
done by a machine equals resistance
force times the distance through which
the force is applied.

(Q4b) work output is the work done
by a simple machine, compound machine,
or any type of engine model. In common
terms, it is the energy output, which for
simple machines is always less than the
energy input, even though the forces may
be drastically different
Solutions

* an acid is any substance which produces Hydrogen ions when dissolved in water

* Dispersal of seeds is scattering of seeds from the parents plants

* Vegetables have high chlorophyll than legumes
* Vegetables have low fibre

* Pressure is defined as force over area

* Chloroplast is the chemical substance that aid plants in food making