Mark the statements T (True) or F (False)
1. Biological clock is a popular name given to a mysterious timing system that operates in living beings.
2. Biological clock keeps accurate time of days, weeks, months and even years.
3. Birds migrate, fish spawn, and flowers blossom on schedules set by their inner clocks.
4. Everybody knows where this biological clock is located or how it works.
5. Scientists hope that experiments with plants and animals in outer space may provide more information about how biological clock works.
6. Biological clocks keep track of rhythmic stability in the environment.
7. Internal cycles are called biorhythms.
8. Biorhythms do not continue on schedule in laboratories.
9. Biological clocks in people work on schedules essential to life and health.
10. Many vital body processes are programmed for 12-hour biorhythms.
Circle the correct item
1) Biological clock is a popular name given to a … timing system.
a) mysterious
b) enigmatic
c) secretive
2) It keeps accurate … of days, weeks, months and even years.
a) period
b) time
c) amount
3) The biological clock in … times our periods of sleep and wakefulness and many body activities.
a) human beings
b) people
c) persons
4) No one knows where this biological clock is … or how it works.
a) located
b) situated
c) set
5) Scientists hope that experiments with plants and animals in outer space may provide more information about how biological clock …
a) does a job
b) does an activity
c) works
6) Biological clocks keep track of rhythmic changes in the …
a) environment
b) habitat
c) territory
7) The biorhythms of each … species seem to be timed to enable the organism to take advantage of the changes in its environment.
a) certain
b) particular
c) specific
8) But the biorhythms can be shifted - and the biological clock reset - by …at which the plant or animal gets light.
a) time period
b) changing the time
c) amount
9) Biological clocks in people work on schedules essential to life and …
a) health
b) no illness
c) no disease
10) Each is timed … when it can do the greatest good for the entire body
a) to use
b) to operate
c) to control
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