Last seen: Dec 29, 2021
(a) producers (b) inverted or spindle (c) light (d) saprotrophs (e) oceans
Problem of predation is severe for plants because they cannot move away from their predators.
Phytophagous insects feed on the sap and other parts of the plants.
The monarch butterfly is highly distasteful to the predators. It is due to a chemical present in its body; the butterfly acquires this chemical duri...
Predators are prudent in nature because if a predator is too efficient and over-exploits its prey, then the prey might become extinct and following it...
By introducing a cactus-feeding moth.
In all these, the interacting species live closely together and one of the species is benefitted.
Calotropis plants produce highly toxic cardiac glycosides; hence, the cattle avoid browsing them.
(i) Plants depend on animals (mainly insects) for pollination. (ii) They also depend on animals for dispersal of seeds and/or fruits. (iii) They...
Life history variations have evolved in organisms to maximise their reproductive fitness or Darwinian fitness in their natural habitats.
Bamboo; Pacific Salmon Fish.
It refers to the maximum number of individuals of a population that the given environment can sustain with its resources.
Mortality refers to the number of deaths in the population during a given period.
Natality is defined as the number of births that are added to the initial density in a population during a given period of time.
Tiger census is carried out by counting the pug marks or faecal pellets.
Population density refers to the total number of individuals of a species present per unit area or volume at a given time.
The birth rate of Hydrilla is 10/20, i.e. 500 per thousand or 50 per cent or 0.5 per individual.
The death rate of fruit flies is 8/80, i.e. 100 per thousand or 10 per cent or 0.1 per individual.