Which one of the following is an artificial ecosystem?
Pond
Crop field
Lake
Forest
In a food chain, the third trophic level is always occupied by
carnivores
herbivores
decomposers
producers
An ecosystem includes
all living organisms
non-living objects
both living organisms and non-living objects
sometimes living organisms and sometimes non-living objects
In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
5 kJ
50 kJ
500 kJ
5000 kJ
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
eutrophication
pollution
biomagnification
accumulation
Depletion of ozone is mainly due to
chlorofluorocarbon compounds
carbon monoxide
methane
pesticides
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
decomposers
producers
herbivores
carnivores
In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of
heat energy
light energy
chemical energy
mechanical energy
Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the
food web
ecological pyramid
ecosystem
food chain
Flow of energy in an ecosystem is always
unidirectional
bidirectional
multi directional
no specific direction
Excessive exposure of humans to UV-rays results in
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv) peptic ulcers
(i) and (ii)
(ii) and (iv)
(i) and (iii)
(iii) and (iv)
In the following groups of materials, which group(s) contains only non-biodegradable items?
(i) Wood, paper, leather
(ii) Polythene, detergent, PVC
(iii) Plastic, detergent, grass
(iv) Plastic, bakelite, DDT
(iii)
(iv)
(i) and (iii)
(ii) and (iv)
Which of the following limits the number of trophic levels in a food chain?
Decrease in energy at higher trophic levels
Insufficient food supply
Polluted air
Water
Which of the statement is incorrect?
All green plants and blue green algae are producers
Green plants get their food from organic compounds
Producers prepare their own food from inorganic compounds
Plants convert solar energy into chemical energy
Which group of organisms are not constituents of a food chain?
(i) Grass, lion, rabbit, wolf
(ii) Plankton, man, fish, grasshopper
(iii) Wolf, grass, snake, tiger
(iv) Frog, snake, eagle, grass, grasshopper
(i) and (iii)
(iii) and (iv)
(ii) and (iii)
(i) and (iv)
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
1 %
5 %
8 %
10 %
In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
T4
T2
T1
T3
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
The population of tiger increases
The population of grass decreases
Tiger will start eating grass
The population of tiger decreases and the population of grass increases
The decomposers in an ecosystem
convert inorganic material, to simpler forms
convert organic material to inorganic forms
convert inorganic materials into organic compounds
do not breakdown organic compounds
If a grass hopper is eaten by a frog, then the energy transfer will be from
producer to decomposer
producer to primary consumer
primary consumer to secondary consumer
secondary consumer to primary consumer
Disposable plastic plates should not be used because
they are made of materials with light weight
they are made of toxic materials
they are made of biodegradable materials
they are made of non-biodegradable materials