Questions

Sunspots are a magnetic phenomenon on the Sun.

The reason a sunspot appears dark is that they are cooler than the rest of the Sun's surface and also the gas inside the spot where the magnetic field is strongest is only emitting about 1/4 as much light as from the rest of the solar surface. 

Any substance that does not cause pollution and is capable of getting decomposed by any living organism is called as Bio degradable. Human & animal excreta, plant wastes etc... come under bio-degradable.

Judgement means the ability to make considered decisions or come to sensible conclusions. Progress means advancement. Policy means a strategy or an approach. Dissent means lack of approval. Action means activity. The Board members are usually involved in making decisions. Hence, a word that conveys the related meaning should be used to fill the blank. No other word except judgement makes sense in the given context. Hence, 'judgement' is the correct answer.