Ecosystem

Consider the following statements concerning food chains: (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation (ii) Removal of most of the carnivores resulted in an increased population of deer (iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss (iv) The length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct?

1. (iii), (iv)
2. (ii), (iii)
3. (i), (iv)
4. (i), (ii)

The slow rate of decomposition of fallen logs in nature is due to their:

1. low moisture content
2. poor nitrogen content
3. anaerobic environment around them
4. low cellulose content

About 70% of total global carbon is found in:

1. Grasslands
2. Agroecosystems
3. Oceans
4. Forests

Which one of the following ecosystem types has the highest annual net primary productivity ?

1. Temperate evergreen forest
2. Temperate deciduous forest
3. Tropical rain forest
4. Tropical deciduous forest

Which one of the following is not used for construction of ecological pyramids ?

1. Rate of energy flow
2. Dry weight
3. Fresh weight
4. Number of individuals

Which of the following is expected to have the highest value (g/m2/yr) in a grassland ecosystem ?

1. Net production (NP)
2. Secondary production
3. Tertiary production
4. Gross production (GP)

Bamboo plant is growing in a far forest then what will be the trophic level of it ?

1. Second trophic level (T2)
2. First trophic level (T1)
3. Fourth trophic level (T4)
4. Third trophic level (T3)

Plant decomposers are:

1. Protista and Animalia
2. Animalia and Monera
3. Monera and fungi
4. Fungi and plants

Which is the reason for highest biomass in aquatic ecosystem?

1. Benthonic and brown algae
2. Nanoplankton, blue green algae, green algae
3. Diatoms
4. Sea grass and slime moulds