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Ecosystem

Description: Ecosystem Ecosystem and BiosphereBiology Sum
Number of Questions: 35
Created by: Preeti Dasgupta
Tags: Ecosystem Ecosystem and Biosphere Biology Sum

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What is the name given to the global ecosystem?

Lithosphere
Biosphere
Atmosphere
Hydrosphere

What kind of organisms can produce their own food?

Autotrophs
Carnivores
Omnivores
Herbivores

Which trophic level is represented by the greatest biomass in any ecosystem?

Producers
Herbivores
Primary carnivores
Top carnivores

What name is given to all organisms that feed on other organisms?

Autotrophs
Carnivores
Heterotrophs
Omnivores

Which trophic level is represented by the smallest biomass in any ecosystem?

Herbivores
Carnivores
Top carnivores
Producers

What is the name given to the conditions under which the members of a species live and breed?

Niche
Ecosystem
Habitat
Trophic level

The best example of a mini ecosystem is a/an

water bottle
kitchen
planter
aquarium

What is an ecosystem?

All organisms living in a given region.
Only the producers living in a given region.
The physical settings of a given region.
All organisms and the physical settings of a given region.

What is the correct hierarchy of taxonomic categories?

Kingdom, class, phylum, family, order, species
Kingdom, phylum, order, class, family, genus
Kingdom, phylum, genus, class, species
Kingdom, phylum, class, order, family, genus, species

_______ is an abiotic factor in aquatic ecosystem.

Oxygen
Leaves
Fish
None of these

Which of the following gases is the most abundant in air?

O₂
CO₂
N₂
None of these

What is a biome?

A geographical region with a characteristic climate and biota
The climate of a region
The biota of a region
All of the above

Which of the following animals is nocturnal?

Deer
Bat
Sparrow
Turtle

Which of the following animals is nocturnal?

Lion
Snake
Lizard
Bats

DDT becomes concentrated as it passes through the food chain. It is an example of

denitritification
biological magnification
ammonification
saponification

Which among the following is a rich source of nitrogen?

Amino acids
Patty acids
Carbonic acids
Sulphuric acids

Which among the following statements is not true?

Small animals are more in number than larger ones.
Lion is a producer.
Predators are usually lesser in number than their preys.
Each species is limited in its total biomass by its trophic level.

Which of the following statements is/are true?

Smaller animals are more in number than larger ones.
Each species is limited in its total biomass by its trophic level.
Predators are usually larger than their prey.
All of the above

Nitrogen molecule is quite inert. Which of the following processes is responsible for nitrogen fixation in atmosphere?

Evaporation
Ammonification
Halogenation
Nitrogenation

The process of atmospheric N₂ fixation is done by

plants
animals
industries
lightening

Which of the following bacteria are responsible for nitrification?

Nitrosomonas
Nitrates
Nitrites
All of the above

What is the chemical formula of Ammonia?

NO₂
NH₃
NO₃
HNO₃

Which of the following metals shows the process of biological magnification?

Mercury
DDT
Lead
All of the above

Which of the following metals does not show the process of biological magnification?

Copper
Mercury
Carbon
Lead

Which of the following elements is the most abundant?

C
N
O
CO₂

What is the chemical formula of urea?

NH₂CO₃
NH₂
NH₃
(NH₂)₂ CO

What are the plants that grow in places with scarcity of water known as?

Hydrophytes
Mesophytes
Bryophyte
Xerophytes

The leaf size is reduced in xerophytes to reduce

absorption of heat
intake of O₂
escape of CO₂
evaporation and loss of water

Which of the following factors of the environment is not biotic?

Plants
Microbes
pH
Insects

Which of the following statements is not true for environment?

It includes physical factors of surroundings only.
It includes both physical and biotic factors.
Gas, light and temperature are its physical factors.
A place where an organism lives is known as its habitat.

_______ not a natural calamity.

Cyclone
Earthquake
Tornado
War

What is the appropriate term for herbivores?

Secondary producers
Primary consumers
Secondary consumers
Primary producers

What is consumption, at each level in a food chain, known as?

Trophic stage
Tertiary level
Trophic level
Secondary stage

By which process does carbon return to atmosphere?

Respiration
Breathing
Perspiration
All of the above

What are carnivores that feed on herbivores in a food chain known as?

Primary consumers
Secondary consumers
Tertiary consumers
Top carnivores

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