Tag: ecology and environment

The answer is population because, population is defined as a community that consists of all the individuals of a given species in a specific area. All animals and plants of an area defines all species of plants or animals and in that sense we can say that number of plants or animals in the given area is there. But for a population to form we take into account all the individuals of a given species only, it makes it specific and therefore cannot comprise of  all the animals or plants. So the correct answer is ' all Individuals of a species'. 

The sequence proposed by Darwin and Wallace for organic evolution is Overproduction, variations, constancy of population size, natural selection.First the species produces enormous number of offspring which contains variation. Then extra population is eliminated because not all the offspring can survive because of population stress. Lastly the natural selection operates for the survival of the fittest.

Bagasse is the residue of sugar cane  after the sugar cane containing the  juice is crushed and squeezed. Bagasse around 40%-50% of total sugar cane. 

The diverse climate and the seasonal variations lead to the formation of several zones having flora and fauna with the phenotypic difference. An ecocline or simply cline describes an ecotone in which a series of biocommunities display a continuous gradient. The term was coined by the Huxley in 1938. Clines are the source of genetic and phenotypic variations. It consists of different forms of species, that exhibit gradual phenotypic and / or genetic differences over a geographical area, typically as a result of  diverse environmental condition. 

The differential success in the reproduction of individual organisms is a natural selection that takes place due to the interactions between individual organisms and their environments. Studies however, show that individual organisms do not evolve but it is the population that evolves. Hence, the correct answer is option D.

If the resources are unlimited, the population can continue growing exponentially. In the first year, there were 4 rabbits. In the second year, there were approximately 4 × 4 (4²), or 16 rabbits. In the third year, there were 4 × 4 × 4 (4³) rabbits, about 64. In the fourth year, there were approximately 4 × 4 × 4 × 4 (4⁴) rabbits, or about 256. Following this pattern, we can assume in the fifth year there would be approximately 4 × 4 × 4 × 4 × 4 (4⁵), or 1024 rabbits which is approximate 1000. 

A population is a group of individual of a species inhabiting a particular geographic area. Number of individuals (population size), sex ratio (ratio of total individuals of two genders), age distribution (number of individuals in different age groups namely, childhood, adults and old age) and death rate (ratio of number of dying individuals to total population size) are some of the characters of population. The phenotype is visual/physical expression of the genotype of an individual; hence, it is characters of individually determined by its genotype. Thus, the correct answer is option B.

The phenotype is not the characteristic of the population. It is the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment