Answered: Cockroaches are nocturnal insects and…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Cockroaches are nocturnal insects and are active at night and inactive during the day. You place cockroaches in an experimental chamber which gives you complete control over temperature, relative humidity, and light. Throughout your experiment you keep temperature and relative humidity constant, but you vary light as follows: For the first 3 days, the lights go off at 6 PM each day and come one at 6 AM (a 12/12 light/dark cycle). From days 4-11, you then keep the cockroaches in constant darkness (0/24 light/dark) and you then restore the 12/12 light dark cycle starting on day 12. You measure the activity of the insects and indicate this using the gray bars shown in the graph below:

1. Based on these results, you can correctly conclude that:

a. activity in cockroaches is controlled by an endogenous rhythm.

b. activity in cockroaches is under only exogenous control.

c. the zeitgeber for activity is temperature fluctuation.

d. the data show that the activity of the per gene in the optic lobes does not influence cockroach activity.

e. the cockroaches are not exhibiting circadian activity.

DAY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
6 PM
off I
6 AM
on
12L 12D
OL 24D
-
12L 12D

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