Which of the following are necessary for evolution by natural selection to take place?
(i) Offspring resemble their parents more than other individuals in the population.
(ii) Differences among individuals exist and lead to different numbers of successful offspring being produced.
(iii) Individuals adjust their development depending on the enviorment
(iv) Every individual possess enormous fertillity.

Which of the following are correct ? I. Population is group of individual organisms of the same species in a given area. II. An ecotype is a population of inidividuals of a species, which are genetically different. III. Environment is influnced by many biotic and abiotic factors. IV. Ecade is a place, where and organism lives.

How many of the following statements (s) are correct ? (i) Genus comprises a group of related species which has more characters in common in comparison to species of other genera . (ii) 'pardus' and 'leo' are two different species but both belong to the genus Felis. (iii) Each genus may have one or more than one specific epithets representing different organisms . (iv) A species is a group of individuals with highest fundamental similarities and maximum number of organisms.

How many of the following statements (s) are correct ? (i) Genus comprises a group of related species which has more characters in common in comparison to species . (ii) 'pardus' and 'leo' are two different species but both belong to the genus Felis. (iii) Each genus may have one or more than one specific epithets representing different organisms . (iv) A species is a group of individuals with highest fundamental similarities and maximum number of organisms.

Study the following statements and choose the correct option. I. Life spans of organisms are correlated with sizes. II Death of all individuals is certain III. The organism's habital, internal physiology etc. are collectively responsible for how it reproduces. IV. When offspring is produced by single parent with or called asexual reproduction.

Study the following statements and choose the correct option. I. Life spans of organisms are correlated with sizes. II Death of all individuals is certain III. The organism's habital, internal physiology etc. are collectively responsible for how it reproduces. IV. When offspring is produced by single parent with or called asexual reproduction.

Which of the following statements are correct? I. Mortality is the rate of loss of individuals per unit time due to death. II. Population dispersion affects the size of population. III. Age distribution influences both natality and mortality of the population. IV. Realised natality is the actual death rate found under existing conditions.

Name one example for each of the following : (i) A plant in which both male and female sex organs occurs in the same flower . (ii) A plant in which separate male and female flowers are borne on the same individual at different positions. (iii) A cultivated plant in which neither fruits nor seeds are formed. (iv) A species in which the individual plant in either male of female.

Read the following statements and select the correct option. (i) Increase in metained months after industrialisation in Great Britain is a proof for natural selection. (ii) When more individuals of a population acquire a mean character value, it is called disruption. (iii) Changes in allelic frequency in a population will lead to Hardy-Weinberg equilibrium. (iv) Genetic drift changes the existing gene or allelic frequency in future generations.