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Q.1 Which one of the following is depleting and causing thinning of ozone?
Q.2 The typical environment of a particular organism population community is called
Q.3 Excessive enrichment of water with nutrients by human activity by which large amount of living
organic matter grows is called
Q.4 In an ecosystem, mycorrhizae is an example of
Q.5 Successive stages of eating and being eaten by which recycling of materials and flow of energy
takes place is called
Q.6 What is the niche of an organism in an ecosystem?
Q.7 The distinct levels or links of food chain are called
Q.8 A relationship between two or more organisms of different species in which all partners get
benefit is called
Q.9 Bacteria and fungi are examples of
Q.10 The cause of acid rain is
Q.11 In an ecosystem mycorrhizae are an example of:
Q.12 As a result of destruction of ozone layer there is significant increase in:
Q.13 Higher rate of a biological activity in a nutrient rich pond water is called:
Q.14 Living part of ecosystem is:
Q.15 A living association between two living organisms of different species which is beneficial to both
the partners is called:
Q.16 Individual successions are known as
Q.17 Which one of the following is the ultimate distributional unit within which a species is restrained
by the limitations of its physical structure and physiology?
Q.18 All herbivores belong to which trophic level in the food chain?
Q.20 The relationship in which one organism gets benefit and the other is not affected is called
Q.21 Ozone is a layer of atmosphere extending from ___________ km above earth and absorbs
ultraviolent radiations.
Q.22 Light rays from the sun are absorbed by CO2 and re-radiate as ________ radiations.
Q.23 The gases which are produced by burning of fossils fuels and are responsible for acid rain are:
Q.24 During successions, the first organisms that develop on bare rock are:
Q.26 The organisms of third trophic level are:
Q.27 The ultimate source of energy in an ecosystem is:
Q.28 All the food chains and food webs begin with:
Q.29 The change from bare rock or open area is rapid, especially in the initial stages and follows a
series of recognizable and hence predictable stages. This process is called:
Q.30 The decline in the thickness of ozone layer is caused by: