Organisms can be grouped as producers, consumers and decomposers according to the manner in which they obtain their sustenance from the environment. All green plants and certain bacteria which can produce food by photosynthesis come under this category and are called the producers. These organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are the consumers. Consumers can be classed variously as herbivores, carnivores, omnivores and parasites.
1. If a grasshopper is eaten by frog, then the energy transfer will be from :
a. Producers to decomposers
b. Producer to primary consumer
c. Primary consumer to secondary consumer
d. Secondary consumer to primary consumer
2. Which of the following belongs to the category of primary consumers ?
a. Eagle and snake
b. Grasshopper and cattle
c. Snake and frog
d. Water beetles and fish
3. The organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called :
a. Decomposers
b. Producers
c. Herbivores
d. Carnivores
4. Which of the following limits the number of trophic levels in a food chain?
a. Decrease in energy at higher trophic level
b. Deficient in food supply
c. Polluted air
d. Water
5. The decomposers in ecosystem :
a. Convert inorganic materials to simpler forms
b. Convert organic material to inorganic forms
c. Do not breakdown organic compounds
d. None
