Zones of Marine Water Ecosystem

Q. What kind of adaptations can be seen in the organisms of the abyssal zone?

Q.

Why is phytoplankton so important to the marine ecosystem?

Q. Dolphins and jellyfish are aquatic organisms found in _____ zone.

1. abyssal
2. euphotic
3. bathyal
4. littoral

Q. Photosynthetic activity is completely absent in zone.

Q. The organisms living in zone are mostly floaters and swimmers.

Q. What kind of adaptations can be seen in the organisms of the abyssal zone?

Q. Which among the following are characteristics shown by marine animals of abyssal zone?

1. Flattened bodies
2. Tubular bodies
3. Curved teeth
4. Bioluminescence

Q. Which of the following statements is/are true about abyssal zone?

1. This zone is dark and cold throughout the year.
2. 80% of marine flora and fauna are found in this region.
3. The organisms living in this region are floaters and swimmers.
4. Photosynthesis is absent in this region.

Q. What kind of adaptations can be seen in the organisms of the abyssal zone?

[3 Marks]
[Adaptations in Aquatic Habitat]

Q. Assertion :In open water zone upto the depth to which light can penetrate, called photic zone. Reason: The photic zone is categorised into euphotic and disphotic zone.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Bottom dwelling animals constitute

1. Plankton
2. Nekton
3. Tripton
4. Benthos

Q. Benthos of pond ecosystem are

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

Q. Which among the following can be seen in the twilight zone of the marine ecosystem?

1. Red kelps
2. Sponges
3. Algae
4. Corals

Q. Illuminated zone or producing zone of sea is

1. Euphotic stratum
2. Dysphotic stratum
3. Aphotic stratum
4. None of the above

Q. Pair the organisms with the zone in which it can be found.

1. Euphotic zone
2. Bathyal zone
3. Abyssal zone
4. Dolphins
5. Whales
6. Brittle star

Q. The photic zone has adequate light penetration in the aquatic ecosystem.

1. True
2. False

Q. Plants in euphotic zone have low photosynthetic capacity.

1. False
2. True

Q. The given figure represents the different zonation in deep lake. Which of the following is incorrect regarding it?

1. Y represents light and oxygen levels.
2. Only consumers are found in E.
3. Producers do not occur in A.
4. D receives light at or below compensation point.

Q. What kind of adaptations can be seen in the organisms of the abyssal zone? [3 Marks]