Explanation:

Let's break down the statements:

1. Terrestrial planets are comparatively smaller in size than Jovian Planets.

- This is a correct statement. Terrestrial planets like Earth and Mars are smaller due to their rocky nature, whereas Jovian planets like Jupiter and Saturn are gas giants and much larger.

2. Terrestrial planets rotate much faster than the Jovian planets.

- This is incorrect. Jovian planets typically rotate faster than terrestrial planets. For example, Jupiter has a very short day, rotating in about 10 hours.

3. Terrestrial Planets have much thicker atmosphere compared to Jovian planets.

- This is incorrect. Jovian planets have much thicker and extensive atmospheres made mostly of hydrogen and helium, compared to the thinner atmospheres of terrestrial planets.

Correct Option:

Option 1: 1 only

The first statement is the only correct one.