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Leno4ka [110]
3 years ago
14

What is the definition of chloroplast

Biology
2 answers:
goblinko [34]3 years ago
8 0
In green plants a plastid that contains chlorophyll and in which photosynthesis takes place
timurjin [86]3 years ago
7 0
<span>in green plant cells a plastid that contains chlorophyll, and then which photosynthesis takes place.</span>
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Polygenic means ______________ and _______________ is an example of a polygenic trait.
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3 years ago
The cell theory eventually replaced the concept of spontaneous generation as a result of what experimental evidence?
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<u>Answer:-</u> <em>Option C </em>- evidence that microorganisms cannot grow in boiled broth when new organisms were not allowed to enter.

<u>Explanation:-</u>

  • <em>Theory of spontaneous generation</em> stated that the living organisms can be created from non living matter. However, this theory was disapproved and replaced by the <em>cell theory</em> which stated that all living organisms are created from cells and new cells arise from pre-existing cells.
  • There were several experiments conducted by various scientists to disapprove the theory of spontaneous generation however, the experiment that was most successful to do so was the one conducted by <em>Louis Pasteur</em> in 1859.
  • <em><u>Description of the experiment:-</u></em>

-In his experiment, Pasteur boiled a meat broth in a flask (it was known that boiling the broth kills the micro organisms) and then heated the neck of the flask to bend into a S- shape.

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<em>observations of the experiment</em> :-

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2. Further,when he tilted the flask so that the broth came in contact with the part of the neck where the air borne microorganisms could have settled he was able to observe microbial growth in the flask.

These observations laid the theory of spontaneous generation to rest and proved that <em>organisms can only grow in the presence of pre-existing cells </em>which in this case were the microorganisms.  

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3 years ago
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