Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.
Reason : Adaptive forms of a given trait tend to become more common, less adaptive ones become less common or disappear.

Assertion (A) : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits. Reason (R ) : Adaptive forms of a given trait tent to become more common, less adaptive ones become less common or disappear.

Assertion : Hybrid is formed by cross betwveen two organisms that are different in one, or more traits Reason : Mendel crossed two plants differing in one trait to obtain F_(1) plants which is monohybrid cross

Sexual reproduction is very common in higher plants to produce young ones that shows variation. a) Name the product formed in sexual reproduction in considered as vital link b)Give its significance.

Among the 15th group elements, as one goes from nitrogen to bismuth, the pentavalency becomes less pronounced and trivalency becomes more pronounced due to

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),("Mutation",(i)"Changes in population's frequencies due to chance alone"),("Gene flow",(ii)"Differences in survival and reproduction among variant individuals"),("Natural selection",(iii)"Immigration, emigration change allele frequencies"),("Genetic drift",(iv)"Source of new alleles"):}

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),("Mutation",(i)"Changes in population's frequencies due to chance alone"),("Gene flow",(ii)"Differences in survival and reproduction among variant individuals"),("Natural selection",(iii)"Immigration, emigration change allele frequencies"),("Genetic drift",(iv)"Source of new alleles"):}

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),("Mutation",(i)"Changes in population's frequencies due to chance alone"),("Gene flow",(ii)"Differences in survival and reproduction among variant individuals"),("Natural selection",(iii)"Immigration, emigration change allele frequencies"),("Genetic drift",(iv)"Source of new alleles"):}