Last seen: Mar 10, 2022
Correct answer: (c) Amphibians Explanation: Presently, 12% all the birds species, 23% all mammals species, 31% all gymnosperms species and 32% all...
Correct answer: (c) Kaziranga
Correct answer: (c) All are prone to overexploitation Explanation: Nepenthes, Psilotum, Rauwoljia md Aconitum, all are prone to over-exploitation.
Correct answer:(d) i—C, ii—A, iii—D, iv—B Explanation: (i) Dodo → (C) Mauritius (ii) Quagga → (A) Africa (iii) Thylacine → (D) Australia (iv...
Correct answer:(c) Mostly located in the polar regions Explanation: Characteristic feature of biodiversity hot spots are large number of species, ...
Correct answer: (a) Rain forest of North-East India Explanation: Pitcher plants are found at rain forest of North-East India.
Correct answer: (b) Cynodon Explanation: Carrot grass (Parthenium), Lantana and water hyacinth (Eichhomia crassipe) are invasive weeds that cause ...
Correct answer: (c) Keeping animals in zoological parks Explanation: Destruction of habitat, invasion by alien species, and over-exploitation, of ...
Correct answer: (a) Brazil Explanation: Brazil has the highest biodiversity because it is located near equator.
P/R (Production/Respiration) ratio shows the relationship between gross production and respiration. In climax community the P/R ratio will be 1. In pi...
The movement of nutrient elements through the various components of an ecosystem is called nutrient cycling. Another name of nutrient cycling is bioge...
In the successive serial stages there is a change in the diversity of species of organisms, increase in the number of species and organisms as well as...
Crop fields and an aquarium considered as man-made ecosystems. In artificial ecosystems the biotic and abiotic components of ecosystems are maintained...
(a) Reduction in primary productivity. No biomass available for consumption by higher trophic levels / heterotrophs. (b) Increase in primary product...
Ecosystems need a constant supply of energy to synthesise the molecules they require, to counteract the universal tendency toward increasing disorderl...
Primary Producer’s (First trophic level): Algae, Hydrilla, maize plant, Phytoplankton, Nymphaea, Spirogyra. Primary Consumer (Second trophic level)...
Pyramid of Number Pyramid of number deals with number of individuals in a trophic level. figure.png Pyramid of number in a grassland ecosyst...
The three ecological pyramids that are usually studied are (a) pyramid of number (b) pyramid of biomass and (c) pyramid of energy. Any c...
Among these a young forest will be more productive because primary productivity depends on the plant species inhabiting a particular area. A young for...
Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilised...