In the Hubbard Brook experiment, when the part of the forest was cut down
1. water flowed through the system at a greater rate
2. nitrogen began to accumulate in the system
3. more phosphorus was lost in stream runoff
4. carbon dioxide is released into the environment

Which pair is mismatched  
1. Tundra –Permafrost
2. Savanna – Acacia trees
3. Prairie–Epiphytes
4. Coniferous forest – Evergreen trees

Great Barrier Reef along east coast of Australia is a
1. Population
2. Community
3. Biome
4. Ecosystem

Aquatic ecosystems that are most adversely affected by acid are those that lack:
1. calcium
2. carbonic acid
3. nitrate
4. bicarbonate

Which one of the following is one of the characteristics of a biological community.  
1. Natality
2. Mortality
3. Sex-ratio
4. Stratification

Pneumatophores occur in
1. Halophytes
2. Submerged hydrophytes
3. Carnivorous plants
4. Free-floating hydrophytes

The mass of living material at a trophic level at a particular time is called:      
1. Standing state
2. Net primary productivity
3. Standing crop
4. Gross primary productivity

Highest annual net primary productivity is of  
1.Tropical deciduous forest
2. Temperate evergreen forest
3. Temperate deciduous forest
4. Tropical rain forest

Which one of the following is not a functional unit of an ecosystem 
1. Energy flow
2. Decomposition
3. Productivity
4. Stratification

Vertical distribution of different species occupying different levels in a biotic community is known as:                                                                                                       
1. Stratification
2. Zonation
3. Pyramid
4. Divergence