Biology : Ecosystem

Match the following column I with column II.

Column I	Column II
A. Producer	1. Herbivores
B. Primary consumer	2. Green plants
C. Secondary consumers	3. Saprotrophs
D. Decomposer	4. Carnivores

• A- 1; B- 2; C- 3; D- 4

• A- 2; B- 1; C- 4; D- 3

• A- 2; B- 4; C- 3; D- 1

• A- 3; B- 2; C- 1; D- 4

Pyramid of biomass is more real than the pyramid of number; because

• The former take the size of individuals into consideration, but the later does not

• Number of individuals are easier to count than calculating biomass

• Less number of parameters are considered in the former, but the later accounts the whole existing conditions

• The former may be inverted in some cases, but the later is always upright

The number of taxa present in a particular area of an ecosystem is

• $\mathrm{\alpha }$- diversity

• $\mathrm{\beta }$- diversity

• $\mathrm{\gamma }$- diversity

• $\mathrm{\delta }$- diversity

Read the following statements.

I. Ocean acts as the global sink for CO₂.

II. The atmospheric input of carbon from rainfall is greater.

III. Carbon gas is exchanged between organisms and atmosphere during respiration.

IV. Human activities are increasing CO₂ concentration in the atmosphere.

Choose the incorrect options.

• Only I

• II and IV

• Only III

• None of the above

A food web is more realistic than food chain for showing the feeding relationship in an ecosystem because

• it compares the number of consumers to the number of microorganisms in an ecosystem

• food chains use only a small sampling of organisms

• a food web explains why there are more producers than consumers

• producers are usually eaten by many different consumers and most consumers are eaten by more than one predator

The organisms that thrives on the remains of dead plants and animals are categorised as

• carnivore

• omnivore

• scavangers

• predators

Which of the following is false?

• The energy content in a trophic level is determined by considering individuals of a species in that trophic level

• The succession that occur in newly cooled lava is called primary success

• Rate of succession is faster in secondary succession

• Quantity of biomass in a trophic level at a particular period is called as stop-(standing) crop

Ratio between mortality and natality is called

• population ratio

• vital index

• census ratio

• density coefficient

The biomass pyramid of forest ecosystem is

• linear

• inverted

• tetra angle

• upright

Grassland with scattered trees is :

• savanna

• deciduous forest

• evergreen forest

• tropical rain forest