When green plants are eaten by the primary consumers, a great deal of energy is lost. With reference to this, consider the following statements:
1. Energy is lost as heat to the environment, some amount goes into digestion and the rest for growth and reproduction.
2. An average of 40% of the food eaten is turned into its own body and made available for the next level of consumers.
Which of the statements given above is/are correct?
Both 1 and 2
Incorrect AnswerNeither 1 Nor 2
Incorrect AnswerExplanation:
Based on the source of their nutrition or food, organisms occupy a specific place in the food chain that is known as their trophic level. Producers belong to the first trophic level, herbivores (primary consumer) to the second, and carnivores (secondary consumer) to the third. The amount of energy decreases at successive trophic levels. The energy at a lower trophic level is always more than at a higher level. The pyramid of energy is always upright, and can never be inverted because when energy flows from a particular trophic level to the next trophic level, some energy is always lost as heat at each step. The green plants in a terrestrial ecosystem capture about 1% of the energy of sunlight that falls on their leaves and converts it into food energy. When green plants are eaten by primary consumers, a great deal of energy is lost as heat to the environment, some amount goes into digestion and doing work and the rest goes towards growth and reproduction. Hence, Statement 1 is correct. An average of 10% of the food eaten is turned into its own body and made available for the next level of consumers. Therefore, 10% can be taken as the average value for the amount of organic matter that is present at each step and reaches the next level of consumers. Hence, Statement 2 is not correct.
By: Parvesh Mehta ProfileResourcesReport error