An economic importance of the organism represented by IV is that
it transmits water borne diseases to humans
it is destructive to farm crops
its faeces pollutes drinkng water
it helps control mosquito larvae
Correct answer is B
No explanation has been provided for this answer.
Which of the animals in the diagram represents the oldest creatures in evolutionary history
iii
ii
i
iv
Correct answer is D
Embryos of vertebrates can be used to show evolutionary trends:
- Fishes → Amphibians → Reptiles → Birds → Mammals
In the diagram, the function of the correcting lens is to
diverge incoming rays
converge incoming rays
reflect incoming rays
screen incoming rays
Correct answer is B
The simplest, cheapest, and safest way to correct long sightedness is with glasses.
Convex prescription lenses (called plus lenses) are used to bend light rays slightly inwards / converge them to give a little bit of additional focusing power to the eye.
The eye defect illustrated in the diagram is
myopia
hypermetropia
astigmatism
cataract
Correct answer is B
Long-sightedness affects the ability to see nearby objects. You may be able to see distant objects clearly, but closer objects are usually out of focus.
It can be corrected using a convex lens.
In the diagram, the likely pollinating agent of the flower is?
wind
water
insect
man
Correct answer is C
adaptations of entomophilous / insected pollinated flowers are the following;
- Very conspicuous flowers with brightly coloured petals and perianths.
- Small flowers aggregate into inflorescence to become conspicuous.
- Flowers are usually scented to attract insects.
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