Zones of Fresh Water Ecosystem

Q. Based on light penetration, freshwater ecosystem are classified to:

1. Littoral zone, limnetic zone and profundal zones.
2. Littoral zone and limnetic zones.
3. Littoral zone, limnetic zone and bathyal zones.
4. Euphotic, bathyal and abyssal zones.

Q. A puddle of water can be considered an ecosystem.

1. True
2. False

Q. The animals present in the profundal zone are mostly scavengers and predators.

1. True
2. False

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

1. False
2. True

Q.

What is the interdependence of lotus?

Q. The water is muddy and turbid in littoral zone.

1. True
2. False

Q. Identify the given plant. How does it adapt itself to its habitat?

Q. Mention any four adaptations to check excess transpiration taking place. [4 MARKS]

Q. On which of the following senses do bottom dwellers of profundal zone rely on for locating their food?

1. Smell
2. Taste
3. Hearing
4. Vision

Q.

The habitat depicted in the picture given below is___.

Q. What do you mean by perennating structure

Q. Open water zone in a deep lake/sea is called

1. Profundal zone
2. Littoral zone
3. Limnetic zone
4. Disphotic zone

Q. Littoral zone is found along

1. High mountain
2. Sea
3. River
4. Desert

Q. Poultry farming is practiced with the objective of:
(i) Egg production
(ii) Feather production
(iii) Meat production
(iv) Milk production

1. (i) and (iii)
2. (i) and (ii)
3. (ii) and (iii)
4. (iii) and (iv)

Q. Identify the given plant. How does it adapt itself to its habitat?

Q. Phytoplankton are dominant in

1. Profundal zone
2. Limnetic zone
3. Littoral zone
4. Benthic zone

Q. Match the following organisms with their adaptations.

Column I	Column II
A. Clown fish	I. Symbiosis​
B. Whale​	II. Swim bladder​
C. Marine mammals​	III. Blubber​
D. Salmon fish​	IV. Special kidneys​

Q. Given figure represents the different zones of a lake or a pond.
Identify the labelled parts X, Y and Z and select the correct statement.

1. X constitutes the shallow water banks and is called as littoral zone.
2. Y constitutes the open water zone up-to which light can penetrate and is called as profundal zone.
3. Z constitutes the deep water zone where light cannot penetrate and is called as limnetic zone.
4. All of these

Q.

What is A, B, C and D in the given figure?

1. A: Forewing; B: Spiracle; C: Mouth; D: Antenna

2. A: Hindwing; B: Spiracle; C: Antenna; D: Mouth

3. A: Hindwing; B: Mouth; C: Spiracle; D: Antenna

4. A: Hindwing; B: Spiracle; C: Mouth; D: Antenna

Q. Hydrilla is usually found in ______.

1. water
2. desert
3. forest
4. mountain slopes

Q.

The habitat depicted in the picture given below is___.

Q.

rearrange - venomous/ the / longest of all/ they are /the snakes.

Q.

With respect to the given image identify i and ii respectively.

1. i-intertidal zone , ii-pelagic zone
2. i-photic zone , ii-aphotic zone
3. i-freshwater zone , ii- marine water zone
4. None of these

Q. Which of the following zones of a lake is not habitat for snails, slugs and micro-organisms?

1. Littoral
2. Limnetic
3. Benthic
4. Profundal

Q. Which of the following adaptations can be seen in a lotus plant?

1. Air spaces are present in stem and petioles.
2. Spines instead of leaves.
3. Leaves are thin and coated with a waxy layer.
4. Stems are hollow and flexible.

Q. What is the difference between hydrilla and lotus?

1. Hydrilla has very long roots whereas lotus does not.
2. Hydrilla is present at the water surface but lotus is present under water.
3. Hydrilla is grown on land but lotus is grown in water.
4. Hydrilla is present under water but lotus is present on the water surface.

Q. Which of the following is not a zone of marine ecosystem?

1. Euphotic
2. Bathyal
3. Profundal
4. Abyssal