Stratification in Aquatic Ecosystem

Q. Most animals that live in deep oceanic waters are :

1. Detritivores
2. Secondary consumers
3. Tertiary consumers
4. Primary consumers

Q.

Choose the right sequence with respect to the stratification in a pond/lake ecosystem.

1. Both the assertion and the reason are true and the reason is the correct explanation for the assertion
2. Both the assertion and the reason are true but the reason is not the correct explanation of the assertion
3. The assertion is true but the reason is false
4. Both the assertion and the reason are false

Q. In which zone of a marine biome does maximum photosynthesis takes place?

1. Aphotic zone
2. Abyssal zone
3. Benthic zone
4. Pelagic zone
5. Photic zone

Q. Marine plants grow in marine ecosystems. Shallow water contains small fishes, prawns feeding on algae. The central part of sea has less number of aquatic living organisms. ____________ are secondary consumers in such ecosystems. Ocean has a large amount of nutrients. The bottom of oceans has more number of decomposers.

Q. Identify the scenario from the following alternatives, which is supported by the given plot.

1. As the algae content in a lake increases, the number of fish decreases
2. As the algae content in a lake increases, the number of fish increases
3. As the algae content in a lake decreases, the number of fish decreases
4. As the algae content in a lake increases, the number of fish remains constant

Q.

The organisms dwelling at the bottom of a lake are called

1. Phytoplanktons

2. Zooplanktons

3. Benthos

4. Nektons