Question : Identify a dark-coloured amorphous substance that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.

Option 1: Chitin

Option 2: Humus

Option 3: Carotenoids

Option 4: Colloids

Question : Microbial degradation of nitrates into atmospheric nitrogen is known as:

Option 1: Ammonification

Option 2: Nitrification

Option 3: Denitrification

Option 4: Putrefaction

Question : Molybdenum deficiency affects the activity of:

Option 1: All of the given options

Option 2: Chlorate reductase

Option 3: Nitrogenase

Option 4: Nitrate reductase

Question : Direction: Which one of the given responses would be a meaningful order of the following?

1. Absorption

2. Digestion

3. Nutrition

4. Excretion

Option 1: 3, 1, 2, 4

Option 2: 2, 1, 3, 4

Option 3: 3, 4, 2, 1

Option 4: 3, 2, 1, 4

Question : Which of the following is not correct?

Option 1: Members of Chlorophyceae are commonly called green algae.

Option 2: Members of Phaeophyceae are commonly called red algae.

Option 3: Members of Rhodophyceae are commonly called red algae.

Option 4: Members of Phaeophyceae are commonly called brown algae.