250+ TOP MCQs on Aquatic Ecosystems and Answers

Energy & Environment Management Multiple Choice Questions on “Aquatic Ecosystems”.

1. How many types of aquatic ecosystems are there?
a) One
b) Two
c) Three
d) Four
Answer: b
Clarification: There are two important aquatic ecosystems are there. One is fresh water ecosystem and one more is marine ecosystem. Again these two ecosystems are further divided into various categories. Marine includes sea whereas fresh water includes lakes, rivers and wetlands.

2. Where plants and animals live in aquatic ecosystems?
a) Water
b) Land
c) Air
d) Fire
Answer: a
Clarification: In aquatic ecosystems, plants and animals live in water. These species which are live in water adapted themselves for a different type of aquatic habitats. From breeding to all mechanisms take place inside the water only.

3. What made organisms to build their ecosystem in quatic?
a) Curiosity
b) Evolution
c) Force from other organisms
d) Increase in water level
Answer: b
Clarification: According to scientists Earth’s first cellular life arose primordial in oceans. Later as evolution takes place many animals from aquatic ecosystem came to land and adopt themselves to live in the condition of land.

4. Where can we find both running water as well as stagnant water?
a) Marine ecosystems
b) Wetlands
c) Coral reefs
d) Freshwater ecosystems
Answer: d
Clarification: The freshwater ecosystems that have running water as streams and rivers. Ponds, tanks and lakes are ecosystems where water doesn’t flow. So in freshwater we can find both running water as well as stagnant water.

5. In which of the following we can see fluctuation in the water level dramatically in different season?
a) Coral reefs
b) Brackish water
c) Wetlands
d) Deep oceans
Answer: c
Clarification: Wetlands are special ecosystems in which the water level fluctuates dramatically in different seasons. They have expanses of shallow water with aquatic vegetation form an ideal habitat for fish and water birds.

6. Sea is salty.
a) True
b) False
Answer: a
Clarification: Water flows down rivers and streams from mountains and usually there is no outflows from seas and oceans. Thus all the minerals and salts that are collected as water travels down rivers and lakes are collected in sea. Hence sea is salty.

7. Which is the largest ecosystem on Earth?
a) Desert
b) Forest
c) Grassland
d) Oceans
Answer: d
Clarification: Ocean is the largest ecosystem on Earth. When we see the Earth from space we can only see blue color. That is due to water, seventy percent of Earth’s surface is covered by water, Water is vital for the survival of all living things.

8. Where can we see coral reefs?
a) In pond
b) In desert
c) In shallow trophical seas
d) In dense tropical forest
Answer: c
Clarification: Coral reefs come under Marine ecosystems. Marine ecosystems are highly saline water. Coral reefs are very rich in species and are found only in shallow trophical seas. The coral reefs in India are around the Andaman and Nicobar islands and found in the Gulf of Kutch.

9. Which of the following is among the world’s most productive ecosystems in terms of biomass production?
a) Pond ecosystems
b) Lake ecosystems
c) Brackish water ecosystems
d) River ecosystems
Answer: c
Clarification: Brackish water ecosystems in river deltas are covered by mangrove forests and are among the world’s most productive ecosystems in biomass production. Sunderbans in a delta of Ganges river is one of the example.

10. Which is the simplest aquatic ecosystem?
a) Pond
b) Stream
c) Lake
d) Marine
Answer: a
Clarification: Pond is the simplest aquatic ecosystems. Most ponds become dry after the rain over and are covered by terrestrial plants for the rest of the year. When the ponds fills in the monsoon season, a large number of food chains formed in the pond ecosystems.

11. Which ecosystem is known as giant permanent pond?
a) Lake ecosystem
b) Pond ecosystem
c) Seashore ecosystem
d) Marine ecosystem
Answer: a
Clarification: A lake ecosystem functions like a giant permanent pond. A large amount of its plant material is algae. Algae derives its energy directly from sun, this energy is transferred to microscopic animals which feeds on algae.

12. How many oceans constitute the marine ecosystems around peninsular India?
a) One
b) Two
c) Three
d) Four
Answer: c
Clarification: The Indian Ocean, Arabian Sea and Bay of Bengal constitute the marine ecosystems around peninsular India. In the coastal areas, the sea is shallow while further away it is deep. Peninsular shape helps India to protect from neighboring countries.

13. Beach is classified into which ecosystem?
a) Lake ecosystem
b) Seashore ecosystem
c) Pond ecosystem
d) River ecosystem
Answer: b
Clarification: Beaches can be sandy, rocky, shell covered. On each of these different types several species have evolved to occupy a separate them. There is a presence of crustaceans as crabs that make holes in the sand.

14. Humans are dependent on aquatic ecosystem.
a) True
b) False
Answer: a
Clarification: Humans use aquatic ecosystems for clean freshwater on which human life depends. Water is usually impounded by large dams to ensure supply throughout the year. Agriculture and industry are highly dependent on water.