Why is it necessary to manage our garbage?
Healthy living requires a clean surrounding hence it is very essential to dispose our garbage in a proper way. Proper managing of our garbage can keeps us free from much communicable disease.
A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
(a) Construct a food chain for the pond.
(b) How many links are there in this chain ?
What is meant by bioconcentration of pesticides ? Which common pesticide has accumulated in human body in considerable amounts ?
State whether the following statements are true or false :State whether the following statements are true or false :
(a) In biology, human beings are called producers.
(b) Secondary consumers and tertiary consumers, both are carnivores.
Which of the following belong to the same trophic level ?
Tree ; Frog ; Snake ; Grass ; Lizard
Why is ozone layer getting depleted at the higher levels of the atmosphere? [Delhi (C)]
State two problems caused by the non- biodegradable waste that we generate in our daily life. [All India (C)]
Name the phenomenon in which non-biodegradable chemicals get accumulated progressively at each trophic level of a food chain.
Which one of the following is not a terrestial ecosystem ?
Forest, Grassland, Aquarium, Desert
Which of the following belong to the same trophic level ?
Goat; Spider ; Plants ; Hawk ; Rat .
What is meant by a primary consumer, secondary consumer and a tertiary consumer ? Give one example of each.
Can the organisms of any trophic level be removed without causing any damage to the ecosystem ? Will the impact of removing all the organisms in a trophic level be different for different trophic levels ?
How does a biodegradable waste differ from a non-biodegradable waste ? Give two examples of non- biodegradable wastes which pollute our environment.
Which of the following are biodegradable and which non-biodegradable ?
Glass bottle, Paper, Ball point pen refill, Hay, DDT, Wheat, Cake, Wood,
Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels
At which trophic level a person is feeding when he is eating :At which trophic level a person is feeding when he is eating :
(a) roasted chicken
(b) bread
(c) eggs
(d) apple
(e) fish
What percentage of energy available at the producer level is transferred at successive trophic levels in a food chain ?
Which disease is caused in human beings due to depletion of ozone layer in the atmosphere? [Foreign]
How is ozone formed in the upper atmosphere? Why is the damage of ozone layer a cause of concern to us? State a cause of this damage. [Delhi(C)]
Describe how decomposers facilitate recycling of matter in order to maintain balance in the ecosystem. [Foreign]
Explain the terms ‘producer’ and ‘consumer’. Give two examples of producers and two of consumers.
The number of malaria patients in a village increased tremendously when large number of frogs were exported from the village. What could be the cause for it ?
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum ?
If a harmful chemical enters a food chain comprising cat, mice and plants, which one of these organisms is likely to have the maximum concentration of the harmful chemical in its body ?