Distinguish Between.

Question 13 Marks

Carbon Cycle and Nitrogen Cyde.

Answer

Carbon Cycle	Nitrogen Cycle
(i) The circulation and recycling of carbon from the atmosphere to living organisms and after their death back to the atmosphere is called the carbon cycle.	(i) The circulation and recycling of nitrogen into the form of different compounds through various biotic and abiotic processes in nature is called the nitrogen cycle.
(ii) Main processes involved in the carbon cycle are photosynthesis and respiration.	(ii) Main processes involved in the nitrogen cycle are nitrogen fixation, ammonification, nitrification and denitrification.
(iii) Carbon in the form of carbon dioxide is directly absorbed by plants for photosynthesis.	(iii) Nitrogen gas cannot be directly absorbed by plants. So nitrogen is fixed by the process of nitrogen fixation and then absorbed from the soil.

Question 23 Marks

Gaseous Cycle and Sedimentary Cycle.

Answer

Gaseous Cycle	Sedimentary Cycle
(i) It is an accumulation of the main abiotic gaseous nutrient materials found in the earth’s atmosphere.(ii) It includes nitrogen, oxygen, carbon dioxide, water vapour etc.	(i) It is an accumulation of the main abiotic nutrient materials found in the soil, sediment and sedimentary rocks, etc. of the earth.(ii) It includes soil components like iron, calcium, phosphorus etc.

Question 33 Marks

Food chain and Food web

(difference between)

Answer

Food chain	Food web
Interactions between producers, consumers and decomposers in a definite sequence is called as a food chain.	The interconnection among different food chains in an ecosystem at various levels is called as a food web

Question 43 Marks

Phosphorus and Carbon(difference between)

Answer

Phosphorus	Carbon
It cycles through the Sedimentary cycle	It cycles through the Gaseous cycle

Question 53 Marks

Carnivores and Herbivores(difference between)

Answer

Carnivores	Herbivores
They depend on Herbivores for nutrition	They depend on Producers for nutrition

Question 63 Marks

Producers and Herbivores(difference between)

Answer

Producers	Herbivores
They are present in the 1st trophic level	They are present in the 2nd trophic level

Question 73 Marks

Biotic components and Abiotic component(difference between)

Answer

Biotic components	Abiotic component
Living component of an ecosystem	Physical/Chemical non-living components of an ecosystem

Question 83 Marks

Azotobacter and Rhizobium(difference between)

Answer

Azotobacter	Rhizobium
Free-living nitrogen-fixing bacteria	Symbiotic nitrogen-fixing bacteria

Science Distinguish Between.