Biology, 31.08.2019 04:00 rasbuurry

Which of the following is an example of an experimental scientific investigation?

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Steps of the scientific method:
1.An observation is made.
2.A problem is defined or a question is asked.
3.A hypothesis is proposed.
4.A controlled experiment is set up.
5.Data is collected and analyzed.
6.Conclusions are made.
7.Process is repeated to verify results.

Examples of Scientific Method:
1.Raspberries did not grow well this year.
2.Why did the raspberries not grow well this year?
3.The raspberries did not grow well because we did not get much rain.
4.Raspberry plants are placed in moderately lit areas all receiving the same amount of light each day. Each plant will receive different amount of water. The size of the berries will be recorded daily once the plants begin to produce berries.
5.The raspberry plants receiving 1 cup of water daily grew to 1/2 " in diameter and those receiving two cups of water grew to 3/4 " in diameter.
6.The raspberry plants receiving the most water grew the biggest. Therefore, the hypothesis is supported that this year's raspberries did not get enough rain.
7.Repeat experiment.

Answer from: Quest

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are important factors here. as a cell increases in size, its surface area and volume increase as well. we call that the surface area to volume ratio (sa: vol). but the catch is that volume increases at a greater rate than surface area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow! check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!

Answer from: Quest

Writing, you can revisit previous parts of the lesson by returning to the course map. be sure to refer to the lab’s student guide, which you can find on the first page of the lab experiment activity

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