80 SEPTEMBER 2016 BIOLOGY SPECTRUM
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QUIZZER (NO. 22)
KNOWLEDGE COEFFICIENT
1.Synthesised opiates such as morphine and codeine
provide their analgesic effects by attacking to special
receptors in the brain. Scientists for a long-time
wondered how there could be natural receptors for such
synthesised opiates when the opiates are not part of
mammalian evolutionary history. How does the existence
of endorphins and enkephalins help to explain this
mystery?
- Write the name of the sac which remains well
developed during the bird’s embryological development.
However, it begins to shrink soon after hatching. Its
tissues produce secretions that are responsibe for the
maturation of WBCs.
Refer to the figures given above. Why this class of algae
grows at deeper levels of the ocean than other kinds of
algae?
4.In Ja pan, the Jap a nese dem on strate an ex tremely low
in ci dence of heart at tacks and even hy per ten sion. Descendents
of Jap a nese who move to the United States soon show a
ten dency to ward an in creased in ci dence of heart at tack and an
in crease in blood pres sure, even though there is lit tle
in ter mar riage with the larger pop u la tion in early gen er a tions. This
ten dency de vel ops over a time span of as lit tle as two gen er a tions.
What conclusions about health can be drawn from these facts?
5.What are the effects of gravity on circulation?
Fill in the blanks
6.Amphibians temporarily store water in their ......... and
......... for osmoregulation.
7.Female silk moths secrete ......... as a sex attractant.
8.Marine birds possess ......... in the orbits of eyes for
osmoregulation.
State whether True or False
- Nucleotide bases may have arisen from the condensation of
HCN.
- Xylem cells perform their water-carrying function best after
they die.
KNOWLEDGE
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