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प्रश्न
The following statement is true or false :
In biology, human beings are called producers.
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उत्तर
False. Green plants are known as producers.
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संबंधित प्रश्न
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
Plants → Sheep → Man
Write an aquatic food chain.
What are the various steps of food chain called?
A food chain represents a unidirectional flow of X. What is X?
Write down a food chain which ends with humans.
In a food chain, the initial organism is usually :
(a) photosynthetic
(b) herbivore
(c) saprophytic
(d) parasitic
Which of the following statement is incorrect?
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name two zooplanktons.
What is ten per cent law? Explain with an example.
'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term damage to mankind'. Justify this statement.
What is meant by bioconcentration of pesticides
What does garbage consist of?
Explain why, the flow of energy in the ecosystem is said to be unidirectional.
Explain why, a food chain usually cannot have more than three or four steps.
In addition to wheat plants, a crop field ecosystem has organisms such as snake, peacock, eagle and mice. If the wheat plants are sprayed with pesticides periodically, which of the following will have the minimum concentration of pesticides in the body?
(a) snake
(b) eagle
(c) mice
(d) peacock
A food chain consists of fish, larvae, phytoplanktons and birds. The level of pesticides in water in which the fish, larvae and phytoplanktons live is quite high.
Which other organism you could write in place of bird in the above food chain?
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
