Advertisements
Advertisements
प्रश्न
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.:
Advertisements
उत्तर
According to the 10 per cent law, only 10 per cent of the energy entering a particular trophic level of organisms is available for the next higher trophic level. If the energy at the producer level is 100 J, the energy at the hawk level in both the food chains can be calculated as under.
(i) Plants → Mice Snakes→ Hawks
100 J→ 10 J → 1 J → 0.1 J
(ii) Plants → Mice→ Hawks
100 J → 10 J → 1 J
So, it is clear that hawks will get 10 per cent more energy in the second food chain compared with the first food chain.
APPEARS IN
संबंधित प्रश्न
State with reason any two possible consequences of elimination of decomposers from the Earth.
In a food chain of frog, grass, insect and snake, assign trophic level to frog.
List two biotic components of a biosphere.
What will happen if we kill all the organisms in one trophic level?
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
Name one decomposer.
Give an example of a four step food chain operating in grassland. Name the secondary consumer in this food chain
What will happen if we kill all the organisms in one trophic level?
Write one or two word for the following statement/definition :
Organisms which depend on the producers for food either directly or indirectly
One of the following is a micro-consumer. This one is :
(a) ant
(b) lice
(c) fungi
(d) mosquito
The following is a food chain that ends with human :
How does this food chain differ form a usual food chain involving human such as : plants → goat → human?
The following is a food chain that ends with human :
Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name one phytoplankton.
Fill in the following blank with suitable word :
Lettuce → ............. → Fox
A food chain comprises of cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be :
(a) cat
(b) plants
(c) dog
(d) seed-eating bird
A forest ecosystem having a lot of green plants has some foxes, lions and rabbits in it.
(a) Write a food chain comprising all the four organisms mentioned above.
(b) Name (i) one herbivore, and (ii) two carnivores, in this food chain.
(c) Name the link which is a predator as well as a prey.
(d) Name (i) second trophic level, and (ii) third trophic level.
(e) Which link of this food chain can feed on second trophic level as well as third trophic level, independently?
(f) If the sun provides 1000 J of energy to the plants, then how much energy will be transferred to fox through the food chain.
"Energy flow in food chains is always unidirectional". Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
Give some examples for Biodegradable and Non-biodegradable waste.
| S. No. | Biodegradable waste | Non-biodegradable waste |
| 1. | Food Waste | Plastic Bottles |
| 2. | ||
| 3. | ||
| 4. | ||
| 5. |
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
DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.
