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mr_godi [17]
3 years ago
9

which of the following statements is not true about the evolution of plants? the earliest cells to use photosynthesis gave off o

xygen. the earliest plant forms were bryophytes. the earliest plant cells did not use the sun's energy for food. the first photosynthetic cells were prokaryotes.
Biology
2 answers:
SSSSS [86.1K]3 years ago
7 0
Plant cells have always used the suns energy for food through photosynthesis, so 3 is false
Tamiku [17]3 years ago
5 0

Ans. option). the earliest plant cells did not use the sun's energy for food.

Plants are photosynthetic, autotrophic organisms that use sunlight to make their food. Like other plant cells, earliest plant cells, such as cells of moss and liverworts also used sun's energy and chlorophyll to make food from inorganic nutrients.

Thus, the statement 'the earliest plant cells did not use the sun's energy for food' is not true about the plant evolution.

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Sedimentary rocks are formed from small pieces of rock. Deltas, bottom of waterfalls, and river banks is where they are formed.

Explanation:

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26,000 years

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2 years ago
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Yanni made a chart to compare the strong and weak forces. Which best describes Yanni’s error? Only the weak force is active in t
cluponka [151]

Answer: Option (d) is the correct answer.

Explanation:

Nucleus of an atom consists of protons and neutrons. Protons are positively charged and neutrons have no charge. So, due to the like charges of protons there occurs electrostatic force of repulsion inside the nucleus of the atom.

But due to similar number of neutrons and protons a force that is able to bind both of them together is known as strong nuclear binding energy.

This force is strong enough that it is able to overcome electrostatic force of repulsion. But when there is great difference in the number of protons and neutrons then binding force is not strong enough.

Hence, the atom becomes unstable and undergoes radioactive decay. So, this means weak forces are responsible for radioactive decay.

Thus, we can conclude that the statement which best describes Yanni’s error is that the strong force is responsible for radioactive decay.

8 0
3 years ago
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One of the grand challenges in biology is understanding how the first cells formed on Earth. Since all cells are bound by a cell
coldgirl [10]
<h2>Answer is option "A"</h2>

Explanation:

  • Oils and fats, which in science are called lipids, are known as amphipathic molecules. These molecules have two distinct ends to them: a water-loving (hydrophilic) side and a water-fearing (hydrophobic) side. While the hydrophilic sides of a lipid will associate with the water in a solution, the hydrophobic sides of the lipid all cluster together to 'hide' from the water. Lipids therefore cluster together and form spheres where the hydrophobic sides are in the center away from the water while the hydrophilic sides are on the outside, associating with the water.
  • The ability of the atoms within a group to form hydrogen bonds with the water molecules around them makes them hydrophilic. Oxygen and nitrogen atoms readily form hydrogen bonds with water molecules, so any organic molecules that have oxygen or nitrogen atoms bound to their carbon skeletons will be hydrophilic.
  • For example, if we take the molecule for cholesterol, we see the OH group on the left is hydrophilic and will form hydrogen bonds with water, while the ring structures, which only consist of hydrogen and carbon atoms, are hydrophobic and will not associate with the water.
  • There are many different kinds of lipids with different functions. Lets start by examining phospholipids, which compose the cell membranes of animals. They form lipid bilayers, with one set of hydrophilic heads facing the exterior of the cell membrane and the other set facing the interior (as you can see on the diagram on screen). The hydrophobic portions of the lipid bilayer - the lipid tails - face towards one another, which allows them to hide away from the water inside and outside of the cell.
  • So,the right answer is option A "amphipathic molecules".

5 0
3 years ago
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