Xerophytes means:

A. Grow in desert or dry, hot, sandy place with scanty rainfall
B. A desert habitant is characterized by Blarcity of water in soil, extremely dry intense light, high temp and strong winds
C. Both (a) & (b)
D. None of these

Buttresses are usually found in the plants growing in:

A. Tropical deciduous forests
B. Temperate coniferous forests
C. Temperate broad-leaf forest
D. Tropical rain forest

The trophic structure in an ecosystem is in fact:

A. Producer-consumer arrangement
B. Refers to grazing food chain only
C. Never forms a food web
D. Never photosynthesis dependent

One of the major difficulties in the biological control of insect pests is that:

A. The predator develops a preference to other diets and may itself become a pest
B. They do not always survive when transferred to a new environment
C. The method is less effective as compared to the use of insecticides
D. The practical difficulty in introducing the predator to specific area

The living organisms of all ecosystems collectively constitute:

A. Producers
B. Decomposers
C. Consumers and decomposers
D. Biosphere

When the number of organisms at successive levels are plotted, they assume the space of a pyramid. This is called the pyramid of:

A. Energy
B. Number
C. Biomass
D. Both (a) and (c)

The incorporation of minerals by microbes is called:

A. Mineralization
B. Humification
C. Nutrient immobilization
D. Microbe immobilization

Biotic components of an ecosystem include:

A. Producers only
B. Consumers only
C. Producers and Consumers only
D. Producers, consumers and decomposers

The pyramid of biomass in a parasitic ecosystem is:

A. Upright
B. Inverted
C. Linear
D. Rhomboidal

The river mouth ecosystem is called:

A. Estuarine
B. Lotic
C. Lentic
D. None of these