19
Question
Assertion : The total mass of organic matter of producers is called the standing crop of producer.
Reason : It can only be expressed in fresh weight.
Assertion : The total mass of organic matter of producers is called the standing crop of producer.
Reason : It can only be expressed in fresh weight.
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Solution
The correct option is C The assertion is true but the reason is false
A food chain refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is consumed by another larger organism.
Different organisms occupy different levels in the food chain and each level is referred to as trophic levels.
Standing crop is the mass of living material of organisms present at a certain trophic level at a particular time. It can be measured at each trophic level.
For example, if all producers (like plants, algae etc.) are combined in a given ecosystem and its biomass (mass of living organisms) is measured. This gives the standing crop of producers.
Standing crop can measured in the following two ways :
1. By measuring the biomass of living organisms :
- Fresh weight : It is the weight of the plants when it is harvested and contains a maximum amount of water or moisture.
- Dry weight : It is the dry matter of plants or samples when completely dried. The plants are kept in the shade for drying to make it lose its moisture. Measurement of biomass in terms of dry weight is more accurate than fresh weight because the dry weight excludes the fluctuating water conditions in the biological material.
2. By measuring the number of living organisms : The number of organisms present at a given trophic level at a particular time in an ecosystem.
Hence the assertion is a true statement and the reason is a false statement.
A food chain refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is consumed by another larger organism.
Different organisms occupy different levels in the food chain and each level is referred to as trophic levels.
Standing crop is the mass of living material of organisms present at a certain trophic level at a particular time. It can be measured at each trophic level.
For example, if all producers (like plants, algae etc.) are combined in a given ecosystem and its biomass (mass of living organisms) is measured. This gives the standing crop of producers.
Standing crop can measured in the following two ways :
1. By measuring the biomass of living organisms :
- Fresh weight : It is the weight of the plants when it is harvested and contains a maximum amount of water or moisture.
- Dry weight : It is the dry matter of plants or samples when completely dried. The plants are kept in the shade for drying to make it lose its moisture. Measurement of biomass in terms of dry weight is more accurate than fresh weight because the dry weight excludes the fluctuating water conditions in the biological material.
2. By measuring the number of living organisms : The number of organisms present at a given trophic level at a particular time in an ecosystem.
Hence the assertion is a true statement and the reason is a false statement.
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