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प्रश्न
Explain how harmful chemicals enter our bodies.
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उत्तर
Chemical substances such as pesticides are sprayed over crop plants to protect them from pests and diseases. When herbivorous animals eat plant food, these poisonous chemical pesticides go into their bodies. Man, being an omnivore, eats plant food as well as the flesh of herbivores. Thus, the pesticides present in plant food and in the bodies of herbivores are transferred to the bodies of humans through food. In this way, harmful chemicals enter our bodies.
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संबंधित प्रश्न
"Energy flow in a food chain is unidirectional" Justify this statement.
The following statement is true or false :
Secondary consumers and tertiary consumers, both are carnivores.
Which category of organisms forms the starting point of a food chain?
Construct a food chain comprising the following :
Snakes, Hawk, Rats, Plants
Construct a short foodchain, ending with man.
In a food chain, the initial organism is usually :
(a) photosynthetic
(b) herbivore
(c) saprophytic
(d) parasitic
If a grasshopper is eaten by a frog, then the energy transfer will be from ______.
Organisms of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute the ______.
Fill in the following blank with suitable word :
Grass → ........... → Human
Consider the following food chain
(i) Plants → Mice → Snakes → Hawks
(ii) Plants → Mice →Hawks
If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.:
Most of the water surface of a lake is covered with algae. This algae is part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?
(a) big fish
(b) bird
(c) larvae
(d) small fish
Which of the following is a logical sequence of food chain?
Food chains are very important for the survival of most species.
If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?
______ obtained energy from the chemical breakdown of dead organisms.
Each level in the food chain is called a ______ level.
Which statement is correct with respect to the food chain?
