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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 Foo

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प्रश्न

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?

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उत्तर

Weed→ Tadpole  → Water beetle

There are three links in this food chain

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अध्याय 5: Our Environment - Exercise 1 [पृष्ठ २६९]

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लखमीर सिंग Biology Part 3 [English] Class 10
अध्याय 5 Our Environment
Exercise 1 | Q 34. | पृष्ठ २६९

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संबंधित प्रश्न

What will be the amount of energy available to the organisms of the 2nd trophic level of a food chain if the energy available at the first trophic level is 10,000 joules?


We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.


List two important roles play in the environment by decomposers.


What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?


The following statement is true or false :

Secondary consumers and tertiary consumers, both are carnivores.


Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called ______.


Which of the following group of organisms are not constituents of a food chain?

  1. grass, lion, rabbit, wolf
  2. plankton, man, fish, grasshopper
  3. wolf, grass, snake, tiger
  4. frog, snake, eagle, grass, grasshopper

The sea water contains water beetles, tadpole, fish and weeds.

Which organisms in the food chain are herbivore, and carnivores?


What does garbage consist of?


Explain why, a food chain usually cannot have more than three or four steps.


What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight


If the energy available at the producer level in a food chain is 150 J, how much energy will be transferred to : tertiary consumer?
(a) 15 J
(b) 10 J
(c) 1.50 J
(d) 0.15 J


Your mother always thought that fruit juices are very healthy for everyone. One day she read in the newspaper that some brands of fruit juices in the market have been found to contain certain level of pesticides in them. She got worried as pesticides are injurious to our health.
(a) How would you explain to your mother about fruit juices getting contaminated with pesticides?
(b) It is said that when these harmful pesticides enter our body as well as in the bodies of other organisms they get accumulated and beyond a limit cause harm and damage to our organs. Name the phenomenon and write about it.


Which of the following is a logical sequence of food chain?


______ are organisms that are able to produce their own organic food.


The food chain begins with the energy given by the ______.


Each level in the food chain is called a ______ level.


Animals that eat both plants and animals are called as Carnivores.


What are autotrophs? 


In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?

Grass → Grasshopper → Frog → Snake → Hawk


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