Last seen: Mar 10, 2022
Correct answer: (b) Marine Explanation: In terrestrial ecosystem pyramid of biomass is generally upright. The pyramid of biomass in sea or lake is...
Correct answer: (c) ii and iv Explanation: Productivity is the rate of production of biomass expressed in terms of g-1yr-1 and (heal m-2) yr-1
Correct answer: (a) Inorganic nutrients from humus Explanation: The process of mineralisation by microorganisms helps in the release of inorgani...
Correct answer: (c) ii and iii Explanation: Decomposers like fungi and bacteria are heterotrophs and saprotrophs.
(i) Eurythermal plant species - Red algae (ii) A hot water spring organism - Thermus aquaticus (iii) An organism seen in deep ocean trenches - S...
Since plants produce food through photosynthesis, a process which is only possible when sunlight is available as a source of energy, we can quickly un...
Soil salinity is the salt content in the soil. Salts are a natural component in soils and water. The ions responsible for salination are: Na+, K+, ...
Yes, regional and local variations exist within each biome. Regional and local variations within each biome lead to the formation of a wide variety of...
In accordance with their life styles, parasites evolved special adaptations such as the loss of unnecessary sense organs, presence of adhesive organs ...
Each species has a specific position or functional role within the community, called niche. According to the Gause’s principle, no two species can liv...
Both the species benefit in mutualism. The interaction where one species is benefitted and the other is neither benefitted nor harmed is called commen...
It shows logistic growth. A population growing in a habitat with limited resources show initially a lag phase, followed by phases of acceleration and ...
A population growing in a habitat with limited resources show initially a lag phase, followed by phases of acceleration and deceleration and finally a...
Fig. A: It is a pyramid shaped age pyramid. In this figure, the base, i.e., pre-reproductive stage is very large when compared with the reproductive a...
A population has certain attributes that an individual organism does not. An individual may have births and deaths, but a population has birth rates a...
Fig. 1: It is a single population and all individuals are of the same species, i.e. A - Individual interact among themselves and their environment. ...
(i) Figure ‘A’ shows’ mutualism (plant-animal relationship). (ii) Figure ‘D’ shows predation (leopard killing deer and eating it) (iii) Figure ‘...
(a) Migratory animal - Siberian crane, Salmon (b) Camouflaged animal - Frog, insects (c) Predator animal - Tiger, sparrow (d) Biological cont...
1. Birth rates 2. Death rates 3. Sex ratio 4. Age distribution
Yes. An inverted bell shaped age pyramid is obtained. The young of pre-reproductive age group individuals are less in number and both pre- reproductiv...