Identify the statements which are not true for the natural ecosystem.
(A) Grassland and desert are examples of terrestrial ecosystem.
(B) Oceans and rivers are man-made ecosystems.
(C) Wetland and estuary are examples of aquatic ecosystem.
(D) Crop fields and aquarium are natural ecosystems.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (B) and (D) only
(A) Grassland and desert are examples of terrestrial ecosystem. — True. Forest, grassland and desert are terrestrial ecosystems.
(B) Oceans and rivers are man-made ecosystems. — False. Oceans and rivers are natural aquatic ecosystems.
(C) Wetland and estuary are examples of aquatic ecosystem. — True.
(D) Crop fields and aquarium are natural ecosystems. — False. Crop fields and aquaria are man-made ecosystems.
NCERT Extract:
Ecosystem – “… Since this system is too much big and complex to be studied at one time, it is convenient to divide it into two basic categories, namely terrestrial and aquatic. Forest, grassland and desert are some examples of terrestrial ecosystems; pond, lake, wetland, river and estuary are some examples of aquatic ecosystems. Crop fields and an aquarium may also be considered as man-made ecosystems.”