In 1953, who developed the model that is shown below?

There is no attached model, but the greatest discovery in biology in 1953 could be only the discovery of DNA double helix. Watson and Crick discovered the chemical structure of DNA molecule. They showed that the molecule is looked like twisted ladders, and described it as a double helix. Their discovery was the great basis for a development of modern molecular biology.

No that answer is wrong. you have written the function of mitochondria in chloroplast and function of chloroplast in mitochondria.

An autotrophic protist - they can perform photosynthesis and mainly consist of unicellular algae. they can be divided into number of systematic group according to the shape of their cell and the type of photosynthetic pigments they use.