Advertisements
Advertisements
प्रश्न
What are decomposers? What will be the consequence if the decomposers are completely eradicated from an ecosystem? Give justification in support of your answer.
Advertisements
उत्तर
Decomposers include micro-organisms such as bacteria and fungi that obtain nutrients by breaking down the remains of dead plants and animals. They help in the breakdown of organic matter or biomass from the body of dead plants and animals into simple inorganic raw materials, such as carbon dioxide, water, and some nutrients. If decomposers are completely removed from the surface of earth then the remains of dead plants and animals will accumulate. The minerals and organic or inorganic material present in them will not be made again available for use. Thus it will result in the accumulation of wastes and also unavailability of raw materials. This will affect all the biogeochemical cycles and overall life on earth.
APPEARS IN
संबंधित प्रश्न
A food chain represents a unidirectional flow of X. What is X?
Fill in the following blank with suitable word :
Decomposer organisms are..........in their action.
In a food chain, the third trophic level is always occupied by :
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers
Which of the following is not a producer?
(a) grass
(b) zooplankton
(c) phytoplankton
(d) paddy
The following is a food chain that ends with human :
plants → bee → human
Explain how plants provide food for bees.
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?
How much energy will be available to hawks in the food chain comprising hawk, snake, paddy and mice, if 10,000 J of energy is available to paddy from the sun?
In the food chain given below, if the amount of energy available at fourth trophic level is 5 kJ, what was the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
(a) 500 kJ
(b) 50 kJ
(c) 5000 kJ
(d) 5 kJ
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.
Define – Heterotrophs.
