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Ecosystem - CBSE Class 12th NCERT Solution

Aug 29, 2013 11:47 IST

    Get, detailed solutions to the questions of the chapter Ecosystem from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking scheme. Cbse.jagranjosh.com provided you NCERT solutions for classes 12th math and science subjects.

    Some questions of this chapter are given here.

    Q. What is primary productivity? Give brief description of factors that affect primary productivity.

    Answer

    It is defined as the amount of biomass (organic matter) produced by producers per unit area over a period of time. Variety of environmental factors such as light, temperature, water, precipitation, etc affects primary productivity. It also depends on the availability of nutrients and the availability of plants to carry out photosynthesis

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    Q. Write important features of a sedimentary cycle in an ecosystem.

    Answer

    The reservoir for sedimentary cycles exists in the earth’s crust or rocks. Elements such as sulphur, phosphorus, potassium, and calcium have sedimentary cycles.
    Sedimentary cycles are very slow. They take a long time to complete their circulation and are considered as less perfect cycles. This is because during recycling, nutrient elements may get locked in the reservoir pool, thereby taking a very long time to come out and continue circulation.

    Q. Describe the components of an ecosystem

    Answer

    An interaction which includes both the biological community as well as the non-living components of an area is collectively known as ecosystem. The living and the non- living components interact amongst themselves and form a unit, which gets evident during the processes of nutrient cycling, energy flow, decomposition, and productivity. There are many ecosystems such as ponds, forests, grasslands, etc.

    The two components of an ecosystem are:

    1)Biotic component: Biotic component means living component of an ecosystem that includes biotic factors such as producers, consumers, decomposers. etc. Plants and algae come under producer level. They perform photosynthesis by the help of chlorophyll pigment in the presence of light. Thus, they are also called convertors or transducers. Consumers or heterotrophs are organisms that are directly (primary consumers) or indirectly (secondary and tertiary consumers) dependent on producers for their food.  Bacteria and fungi are the main components of decomposer. They form the largest population in a food chain and depend on the dead plants and animals for the nutrients


    2)Abiotic component: Abiotic component means non-living component of an ecosystem such as inorganic nutrients, water, soil, air, light, temperature, etc.

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