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Alinara [238K]
2 years ago
15

Harvester ants often strip a bush of all of its leaves. Some people believe this helps the plant grow thicker, healthier stems.

In an experiment, a student stripped off all the leaves from a set of plants. In a second set of identical plants, the student allowed ants to strip off the plants' leaves. In order to improve this experimental design, it is most important to add a set of plants
Biology
2 answers:
GrogVix [38]2 years ago
6 0
With unstripped leaves for comparison.
LUCKY_DIMON [66]2 years ago
5 0

Answer:

The correct answer will be- the control group of plants with leaves on them.

Explanation:

Harvester ants are the ants which collect the seeds of the plants and store them as a source of food in their nests in soil.

The experimenter observes that stripping of the plant leaves by the ant increases the thickness. The experiment was designed to study the thickness of the stem with one group in which the leaves were stripped by the humans and one group with leaves stripped by the ants.  

These cases represent the experimental groups in which stem thickness will differ but it lacked the control group which will have the plants with their leaves present on them and preventing them from stripping by human and ants.

This control group will provide a reference to the experimental groups and will improve the experiment.

Thus, the control group of plants with leaves on them is the correct answer.

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Both C and E are reasonable answers.

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Homeostasis describes the body's ability to maintain a stable equilibirum. In other words, if the body experiences a stress, it will generate a response that works to counteract that stress and restore itself to how it was prior to the stress.

A. This describes a cause and effect (BP down --> venous return down). It does not describe an active physiological response to counteract the BP drop such as an increase in heart rate. Not homeostasis.

B. Again, a cause and effect is described. Blood vessel walls becoming thinner is not a response to counteract increased BP. Not homeostasis.

C. Here a response to a stress is described. Men are drinking more water. The body responds by getting rid of that water, restoring the body to its former state. This describes homeostasis.

D. This sounds like homeostasis, but it's actually the opposite of what happens. Dilation of peripheral blood vessels is a way for the body to get rid of heat. This is the opposite of what you would want if the body got colder - it would make the stress worse, which is the opposite of homeostasis. In actuality the response to cold temperature is constriction of blood vessels to preserve heat.

E. This deescribes homeostasis. The stress is increased glucose. The body's response to manage it is to release insulin, which helps remove the glucose from circulation.

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