Q.26 The organisms of third trophic level are:
A) Primary consumer C) Tertiary consumer
B) Primary producer D) Secondary consumer
Q.27 The ultimate source of energy in an ecosystem is:
A) Photosynthesis C) Plants
B) Sun D) Water
Q.28 All the food chains and food webs begin with:
A) Detritus C) Green plants
B) Herbivores D) Omnivores
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:
A) Pioneers C) Succession
B) Xerosere D) Secondary succession
Q.30 The decline in the thickness of ozone layer is caused by:
A) Increasing level of nitrogen oxide C) Decreasing level of CFCs
B) Decreasing level of O2 D) Increasing level of CFCs