The theory of endosymbiosis provides a possible explanation for how eukaryotic cells came into existence. the presence of chloroplasts in photosynthetic organisms is one phenomenon explained by this theory. based on the theory of endosymbiosis, what was the significance of the development of chloroplasts?

The correct answer is -

Chloroplasts is a double membrane bound specialised organelle that is present in the photosynthetic organsisms (such as plants and algae).

The inner membrane is similar to membrane of ancient prokaryotes that could perform photosynthesis.

In other words, it helps in the synthesis of food (glucose) using carbon dioxide and water in the presence of sunlight.  

In the process of photosynthesis, Oxygen is released as a waste product (when photolysis of water takes place to provide electrons, required in the photosynthesis) in the atmosphere.

Due to this, oxygen rich environment is produced, which allowed the formation of more complex, aerobic life forms (that is oxygen breathing organisms) on the planet Earth.

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explanation:

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.