FREE NEET Biology Practice MCQ Test: Ecosystem Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (c)

Answer: (d)

Answer: (d)

Answer: (b)

Answer: (b)

Answer: (a)

An ecosystem may be defined as a structural and functional unit of the biosphere comprising living organisms and their non-living environment that interact by means of food chains and chemical cycles resulting in energy flow, biotic diversity and material cycling to form a stable, self supporting system. The organisms in an ecosystem are classified into 3 main categories producers, consumers and decomposers. The consumers utilise materials and energy stored by the producers. Decomposers obtain their food molecules from the organic materials of dead producers and consumers. In a true ecosystem, producers are more than consumers (herbivores and carnivores).

Answer: (b)

An ecosystem having low stability can be easily damaged. An ecosystem having high resilience will takeless time to recover.

Answer: (a)

The process of transfer of energy from producers through a series of organisms, i.e., from primary consumers to secondary consumers and from secondary consumers to tertiary consumers by process of eating and being eaten constitute a food chain. The correct food chain is :

Phytoplankton → Zooplankton → Fish

Answer: (c)

A single species may occupy more than one trophic level. Sparrow can be a primary consumer if it feeds on seeds, fruits and peas or a secondary consumer if it feeds on insects and worms.

Answer: (a)

Answer: (c)

Answer: (b)

The correct sequence of plants in a hydrosere is Volvox, Hydrilla, Pistia, Scirpus, Lanatana and Oak. A hydrosere is a plant succession which occurs in a fresh water lake. In time, an area of open fresh water such as a lake will naturally dry out, ultimately becoming woodland. During this change, a range of different land types such as swamp and marsh will succeed each other. The succession from open water to climax woodland is likely to take at least two hundred years.

Answer: (b)

Answer: (b)

Answer: (d)

The term ecosystem was coined by A.G. Tansley in 1935.

Answer: (d)

2/3 parts of earth is ocean, here various types of food chains form food webs. This ecosystem is most stable due to buffering action of water.

Answer: (c)

Answer: (c)

Answer: (d)

The pyramid of energy is always upright for any ecosystem. This situation indicates the fact that herbivores have a better energy conversion efficiency than carnivores.

Answer: (a)