CUET Preparation Today
Match List-I with List-II
Choose the correct answer from the options given below: |
(A)- (II), (B)- (III), (C) -(IV), (D) -(I) (A)- (I), (B)- (III), (C) -(II), (D) -(IV) (A)- (I), (B)- (II), (C) -(IV), (D) -(III) (A)- (III), (B)- (IV), (C) -(I), (D) -(II) |
(A)- (II), (B)- (III), (C) -(IV), (D) -(I) |
The correct answer is Option (1) → (A)- (II), (B)- (III), (C) -(IV), (D) -(I)
(A) Humification leads to accumulation of a dark coloured amorphous substance called humus that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate. Being colloidal in nature it serves as a reservoir of nutrients. (B) The detritus food chain (DFC) begins with dead organic matter. It is made up of decomposers which are heterotrophic organisms, mainly fungi and bacteria. They meet their energy and nutrient requirements by degrading dead organic matter or detritus. These are also known as saprotrophs (sapro: to decompose). (C) The green plant in the ecosystem are called producers. In a terrestrial ecosystem, major producers are herbaceous and woody plants. Likewise, producers in an aquatic ecosystem are various species like phytoplankton, algae and higher plants. (D) Biomass is the total mass of all living organisms, including plants, animals, microorganisms, and fungi.The rate of biomass production is called productivity. It is expressed in terms of gm–2 yr –1 or (kcal m–2) yr–1 to compare the productivity of different ecosystems. |
