Class 10 Biology
Environment
Exemplar Problems MCQ I
Which one of the following is an artificial ecosystem?
- Pond
- Crop field
- Lake
- Forest
Answer: (b) Crop field
In a food chain, the third trophic level is always occupied by
- Carnivores
- Herbivores
- Decomposers
- Producers
Answer: (a) Carnivores
In a food chain, the third trophic level is always occupied by
- Carnivores
- Herbivores
- Decomposers
- Producers
Answer: (a) Carnivores
An ecosystem includes
- All living organisms
- Non-living objects
- Both living organisms and non-living objects
- Sometimes living organisms and sometimes non-living objects
Answer: (c) Both living organisms and 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 k J
- 50 k J
- 500 k J
- 5000 k J
Answer: (d) 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
Answer: (c) Biomagnification
Depletion of ozone is mainly due to
- Chlorofluorocarbon compounds
- Carbon monoxide
- Methane
- Pesticides
Answer: (a) Chlorofluorocarbon compounds
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
- Decomposers
- Producers
- Herbivores
- Carnivores
Answer: (b) Producers
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
Answer: (c) Chemical 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
Answer: (b) Ecological pyramid
Flow of energy in an ecosystem is always
- Unidirectional
- Bidirectional
- Multi directional
- No specific direction
Answer: (a) Unidirectional