Stratification in Aquatic Ecosystem

Q.

The second trophic level in a lake is:
(a) phytoplankton
(b) zooplankton
(c) benthos
(d) fishes

Q. In an aquatic food chain, if the water body has 0.003 ppb of DDT, its maximum concentration can be observed in

1. large fishes
2. phytoplankton
3. fish-eating birds
4. small fish

Q.

Which one is not a character of the community?

1. Natality

2. Dominance

3. Species diversity

4. Stratification

Q.

Individuals of one kind occupying a particular geographic area at a given time are called:

1. Community

2. Population

3. Species

4. Biome

Q.

what is climax community?

Q. The organisms dwelling at the bottom of a lake are called

1. Phytoplanktons
2. Benthos
3. Zooplanktons
4. Nektons

Q. Choose the correct statement(s) from the following:

1. Rooted vegetation is found in Littoral zone.
2. Open water with floating planktons are found in Limnetic zone.
3. Deep water containing crabs is found in profundal zone.
4. Stratification is found in only aquatic ecosystems.

Q. Organisms living in the lowest level of a body of water are considered as

1. Benthic
2. Epipelagic
3. Mesopelagic
4. Planktons

Q.

What are the aquatic ecosystem services?

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. Both the assertion and the reason are false
4. The assertion is true but the reason is false

Q.

Where do most algae grow?

Q. The second trophic level in a lake is
(a) Phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes

Q. Which one of the following is a characteristic of a biological community ?

1. Stratification
2. Natality
3. Mortality
4. Sex-ratio

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

1. Littoral zone ----- Limnetic zone ----- Profundal zone
2. Profundal zone ------- limnetic zone ------ littoral zone
3. Limnetic zone ------- littoral zone ------ Profundal zone
4. None of the above

Q. Which one of the following is a characteristic of biological community?

Q. Assertion :Coral reefs serve as stable marine ecosystems Reason: These are formed by accumulation of debris

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. Choose the aquatic ecosystem(s):

1. Marine
2. Forest
3. Lotic
4. Lentic

Q. Above given diagram represents a relation with environment. This relation is known as-

1. Species ecology
2. Autecology
3. Synecology
4. Gene ecology

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

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

Q. Choose the correct answers from the alternatives given :
Which of the following factors is least likely to affect the type of organism colonizing a pond

1. Acidity of water
2. Age of pond
3. Amount of rainfall
4. Amount of sunlight falling on the pond

Q. Name the term used to describe a single dominant species, that dictates community structure

1. Pioneer species
2. Transitional species
3. Keystone species
4. Indigenous species
5. Exogenous species

Q. Choose the correct statement(s) from the following:

1. Rooted vegetation is found in Littoral zone.
2. Open water with floating planktons are found in Limnetic zone.
3. Deep water containing crabs is found in profundal zone.
4. Stratification is found in only aquatic ecosystems.

Q. Which one occupies more than one trophic level in a pond ecosystem?

1. Zooplankton
2. Phytoplankton
3. Fish
4. Frog

Q. Benthic organisms are affected the most by

1. Surface turbulence of water
2. Sediment characteristics of aquatic ecosystems
3. Water-holding capacity of soil
4. Light reaching the forest floor

Q. Choose the correct statement(s) from the following:

1. Rooted vegetation is found in Littoral zone.
2. Open water with floating planktons are found in Limnetic zone.
3. Deep water containing crabs is found in profundal zone.
4. Stratification is found in only aquatic ecosystems.

Q.

The second trophic level in a lake is-

(a) Phytoplankton

(b) Zooplankton

(c) Benthos

(d) Fishes

Q. The organisms dwelling at the bottom of a lake are called

1. Phytoplanktons
2. Zooplanktons
3. Nektons
4. Benthos

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

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

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

1. Profundal zone ------- limnetic zone ------ littoral zone
2. Littoral zone ----- Limnetic zone ----- Profundal zone
3. Limnetic zone ------- littoral zone ------ Profundal zone
4. None of the above

Q. Which one of the following is one of the characteristics of biological community?

1. Stratification
2. Mortality
3. Natality
4. Sex Ratio