Free Ecosystem (Daily Quiz: 1) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Free Ecosystem (Daily Quiz: 1) Time:

Question-1

The rate of decomposition is quicker when detritus is rich in

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

In a particular climatic condition, decomposition rate is slower if detritus is rich in lignin and chitin and quicker, if detritus is rich in nitrogen and water soluble substances like sugars.


Question-2

Which of the following is/are example(s) of detritivore?

(a)

(b)

(c)

(d)


Question-3

The primary succession refers to the development of communities on a

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

When succession begins on an area which has not been previously being occupied by a community, e.g., a new exposed rock area, sand dunes, new islands, deltas, shore or recent lava flow, it is known as primary succession. The first group of organisms (plants or animals) which become established in such an area is termed the pioneer community.


Question-4

Which of the following would appear as the pioneer organisms on bare rocks?

(a)

(b)

(c)

(d)

Explanation:

Answer: (a)

The bare rocky habitat is extremely hostile to living beings. There is no water, as the substratum does not absorb rain water. There is no nutrient holding mechanism. Plants cannot grow on these rocks. The first inhabitants or pioneers of such a habitat are usually lichens as they are resistant to desiccation and extreme temperature.


Question-5

Given below is an imaginary pyramid of number. What could be one of the possibilities about certain organisms at some of the different levels?

ecosystem-class-xii-Chapter-14-neet-mcq-10-354-99

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

The given figure shows spindle-shaped pyramid of number in single tree ecosystem. Here, a single, largesized tree provides food to large number of herbivores, which in turn support a few carnivores and the later are eaten up by small number of top carnivores. So, here PP is used for Primary Producer, i.e. single tree, PC is Primary Consumers, i.e. large number of insects, SC is Secondary Consumers, i.e. small insectivorous birds and TC is Top Consumers, which may be eagles or falcon, etc.


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