Howg o o d i s
y o u r
s c i e n c e
K Q ?
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How Good Is Your Science KQ?
[i.e. your Knowledge Quotient]
Honeypots and Cows – It’s all about
Insects!
Have you ever eaten an insect?
It is virtually impossible that you have not done so. It probably did you no harm, perhaps even did you some good by providing extra protein in your
meal! So, under what circumstances are you likely to have eaten insects without
realizing it? Flour beetles, weevils, and other insect pests that infest
granaries are milled along with the grain to produce flour. Small grubs and
other tiny insects are found in fruits and vegetables. Insects are not uncommon
in canned and other types of processed food.
Sometimes insects are sought
out as part of a regular diet. Certain types of ants were a valued food that
provided a source of sugar for the aboriginal people of central Australia.
Worker ants of this type gather ‘honeydew’, a sugary secretion, from
scale insects and psyllids (related to aphids), and feed it to other workers,
which function as nectar ‘storage vessels’ with their greatly
enlarged abdomens. The storage ants, kept safe in deep underground galleries of
the ant colony, regurgitate nectar for other members of the colony. Australian
aborigines would dig into the nests to get to this tasty source of sweetness.
Scale Insects, psyllids, and aphids, feed on garden plants by sucking
their sugar-rich sap. The insects cannot metabolize all the sugar and secrete
the extra as honeydew, which drips onto the leaves and stems of the plants they
are feeding on. The syrupy honeydew attracts flies, wasps and ants. Some species
of ants are so addicted to this sweet food that they protect aphids from
predators and move them to new plants if the ones they are on start to wilt.
Some ants even build small shelters over aphid species that feed near the base
of a plant.
The Stumper Questions: 1. Which of the insects
mentioned, the ants or aphids, is called ‘Honeypot’ and which is
called ‘Cow’?
2. Aphids are garden pests. Lady beetles and lacewings eat
aphids but not fast enough! What plants repel aphids?
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