The sum total of all the ecosystems on planet earth is called

• Atmosphere
• Hydrosphere
• Biosphere
• Lithosphere

According to 10% rule if an organism has taken food of 100 kcal, how much of it would be transferred to next trophic level

• 90 kcal
• 10 kcal
• 100 kcal
• 0 kcal

The increase in the amount of non-biodegradable elements while moving from one trophic level to another is called as

• Bioremediation
• Eutrophication
• Biodegradation
• Biomagnification

In an ecosystem the flow of energy is

• Bidirectional
• Cyclic
• Unidirectional
• Multidirectional

The pyramid of number is inverted in

• Cropland ecosystem
• Forest ecosystem
• Grassland ecosystem
• Pond ecosystem

The term �ecosystem� was proposed by British ecologist

• Lindeman
• Tansley
• Whittaker
• Elton

The ecosystems that are found on land are called

• Aquatic
• Diurnal
• Terrestrial
• Nocturnal

The process of successful establishment of the species in an area as a result of conditions prevailing there is known as

• Nudation
• Migration
• Ecesis
• Invasion

The occurrence of relatively definite sequence of communities over a period of time in the same area is known as

• Ecosystem
• Food chain
• Food web
• Ecological succession

Non-green plants like mushroom cant make their own food because:

• They are too small
• They lack chlorophyll
• They lack photo-tropism
• They lack roots to suck wate

Biotic components DONOT include

• Air
• Plants
• Animals
• Human beings

Producers DONOT include

• Lions
• Ferns
• Evergreen trees
• Fir trees

Environmental problems are not confined to one component because of

• Constant mass and energy transfer between components
• Ocean currents
• Soil formation
• Animal migrations

Important abiotic factors in ecosystems include which of the following?Temperature, Water, Wind

• I only
• II only
• III only
• I, II, and III

Example of Anthropogenic Ecosystem

• Forest
• Marine water
• Grass land
• Agricultural crops

Limiting factors are:

• Availability of food
• Water
• Shelter
• All of the above

Non-living Component is

• Organic
• Inorganic
• Physical
• All of the above

All of the following statements about ecology are correct except:

• Ecology is the study of the interactions between biotic and abiotic aspects of the environment.
• Ecology is a discipline that is independent from natural selection and evolutionary history.
• Ecologists may study populations and communities of organisms.
• Ecology spans increasingly comprehensive levels of organization, from individuals to ecosystems.
• Ecological studies may involve the use of models and computers.

The nature�s cleaners are

• producers
• consumers
• decomposers
• producers & decomposers both

The development of a bare area is called:

• Invasion
• nudation
• ecesis
• none