Heat and Energy Exe-6B Long Answer Concise Physics ICSE Class-9 Selina Publishers

Heat and Energy Exe-6B Long Answer Concise Physics ICSE Class-9 Selina Publishers. There is the solutions of Long Answer type Questions of your latest textbook which is applicable in 2024-25 academic session. Visit official Website CISCE for detail information about ICSE Board Class-9

Heat and Energy Exe-6B Long Answer Concise Physics ICSE Class-9 Selina Publishers

Board	ICSE
Class	9
Subject	Physics
Writer / Publication	Concise Selina Publishers
Chapter-6	Heat and Energy
Exe-6B	Energy Flow and its Importance
Topics	Solution of Exe-6(B) Long Answer Type
Academic Session	2024-2025

Exercise- 6B Energy Flow and its Importance

page -148

Long Answer :

Q1- Draw a simple diagram showing a food chain.

Ans-

Q2- Describe the energy flow in an ecosystem.

Ans- Ecosystems maintain themselves by cycling energy and nutrients obtained from external sources. At the first trophic level, primary producers (plants, algae, and some bacteria) use solar energy to produce organic plant material through photosynthesis.

Herbivores-animals that feed solely on plants-make up the second trophic level. Predators that eat herbivores comprise the third trophic level; if larger predators are present, they represent still higher trophic levels. Decomposers, which include bacteria, fungi etc. break down wastes and dead organisms and return nutrients to the soil

Q3- Show that the energy flow in an ecosystem is linear.

Ans- The energy flow in ecosystem is linear i.e., it moves in a fixed direction. The solar energy is absorbed by plants and a part of it is converted into food. These plants (or primary producers) are then eaten by the primary consumers, which are consumed by secondary consumers and the secondary by tertiary consumers. This cycle is unidirectional.

The dead and decomposed are fed by decomposers, which return the nutrients to the soil. At the end, the energy reaches the degraded state. It does not return to the sun to make the process cyclic, thus energy flow is linear.