Energy flow and ecological pyramids
- Given below are two statements :Statement I : In ecosystem, there is unidirectional flow of energy of sun from producers to consumers.Statement II : Ecosystems are exempted from 2nd law of thermodynamics.In the light of the above statements, choose t… Answer: 3. Statement I is correct but statement II is incorrect Key idea: Energy flow in an ecosystem is unidirectional, and it obeys thermo... 1
- In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is100x (kcal m^-2) yr^-1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem? Answer: 4. 10x (kcal m⁻²) yr⁻¹ Key idea: the energy a trophic level can pass on is its net productivity; about 10 percent of it is stored by... 1
- Which of the following statements is not correct ? Answer: 2. Pyramid of biomass in sea is generally upright. Find the statement that is not correct. In the sea, producers are tiny phytoplank... 1
- Match the trophic levels with their correct species examples in grassland ecosystem.(a) Fourth trophic level (i) Crow(b) Second trophic level (ii) Vulture(c) First trophic level (iii) Rabbit(d) Third trophic level (iv) GrassSelect the correct option… Answer: 1. (a) (ii), (b) (iii), (c) (iv), (d) (i) In a grassland food chain: grass (producer, 1st level) - rabbit (primary consumer, 2nd) -... 1
- Which of the following ecological pyramids is generally inverted ? Answer: 4. Pyramid of biomass in a sea Key idea: A pyramid is inverted when producers weigh less than consumers at a given time. In the sea,... 1
- What type of ecological pyramid would be obtained with the following data ?Secondary consumer : 120 gPrimary consumer : 60 gPrimary producer : 10 g Answer: 1. Inverted pyramid of biomass A pyramid of biomass is inverted when higher trophic levels have more biomass than lower ones. Here b... 1
- The highest DDT concentration in aquatic food chain shall occur in Answer: 1. seagull DDT is not broken down and builds up at each higher trophic level (biomagnification). The seagull is the top consumer her... 1