Last seen: Dec 29, 2021
Decomposition is the breakdown of dead or wastes organic matter by micro-organisms. Decomposition is both physical and chemical in nature. Processe...
The rate of biomass production is called productivity. It is expressed in terms of g-2yr-1 or (Kcal-m-2) yr-1 to compare the productivity of ecosyste...
An ecological pyramid is a graphic representation of an ecological parameter, as a number of individuals present in various trophic levels of a food c...
Ecosystem: The system resulting from the interaction between organisms and their environment is called an ecosystem. (a) Producers: Organisms, whic...
Primary productivity (i) It is the amount of organic matter generated by producers per unit area over a specific span of time. (ii) It is comparat...
Food chain (i) Constitutes for a single linear sequence of entities. (ii) Members inhabiting higher trophic levels feed only on one type of entity...
Production (i) Rate of producing food(organic matter) by producers is known as production. (ii) For primary production, sunlight is required. (i...
Litter (i) Comprises of all kinds of wastes above the ground level. (ii) Consists of biodegradable and non-biodegradable substances. (iii) It i...
P(A) = p, P(B) = 2p P(A ∪ B) - P(A ∩ B) = 3p - 2p (A ∩ B) = ∴ P(A ∩ B) = p - Also, P(A ∪ B) ≤ 1 + ≤ 1 ≤ ∴ p ≤ Pmax =
Correct answer: (a) 1/2 Explanation: a + ar + ar2 + .....∞ = 15 ⟹ = 15 ....(1) a2 + (ar)2 + (ar2)2 + ....∞ = 150 ⟹ = 150 ....(2) Squar...
Correct answer: (c) 20.21.218 Explanation: (1 + x)20 = C0 + C1x + C2x2 + ....+C20x20 Differentiate w.r.t. x 20(1 + x)19 = C1 + 2C2x+ .....20C2...
Answer (a) 10.5, 26 Explanation n = 20, = 10, σ = 2.5 = = 10.5 2.5 = Σxi2 = 2125 ∴ (Σxi2)new = 2125 - 625 + 1225 = 2725 ∴ σnew...
Correct answer: (1) ln 16 Explanation: = dx = dx I = 8 dx = -4 = 4 ln 2 = ln 16
Correct answer: (a) Explanation: y2 = 30x 4a = 30 ⟹ a = Equation of tangent y = mx + ⟹ y = mx + Passes through (-30, 0) ⟹ 0 = ...
Upright pyramid: Pyramid of energy is always upright Pyramid of numbers and biomass can be inverted. At the producer level of an ecosystem, this p...
Grazing food chain (i) The chain begins with producers as the first trophic level. (ii) Energy for the food chain comes from sun. (iii) Food cha...
Correct answer: (b) 50% Explanation: Photosynthetically active radiation or PAR constitutes about 50% of the total incident solar radiation.
(d) none of these Explanation: There are no secondary producers. Plants are the only producers. They are autotrophs and synthesize their own food ...
(b) zooplankton Explanation: Zooplankton forms the second trophic level in a lake as they are the primary consumers in food chain that is aquatic,...
(d) decomposer’s Explanation: Decomposers form the largest population in food chain. They include microbes such as bacteria and fungi, that derive...