When we say 'survival of the fittest', does it mean that
(i) those which are fit only survive?
(ii) those that survive are called fit?
Comment.

A beneficial association which is necessary for survival of both partners is called :

Given : 1 = Natural selection , 2 = Variations and their inheritance , 3 = Survival of the fittest , 4 = struggle for existence According the Darwinism, which of the following represents the correct squence of events in the origin of new species ? (a) 3,4,1,2 (b) 2,3,1,4 (c) 1,2,3,4 (d) 4,2,3,1

From the three pairs of lines given below, identify those which uniquely determine a plane : (i) intersecting pair, (ii) parallel pair, (iii) a pair of skew lines.

There are 64 codons in the genetic code dictionary. (i)How many of them code for amino acids? (ii) How many amino acids are coded? (iii) What term would you give to those codons, which do not code for amino acids?

Which of the following statements regarding the ethical argument for conserving biodiversity is incorrect? (a) We owe to millions of plant, animal and microbes species with whom we share this planet (b) Every species has an intrinsic value only when it is of an economic value to us. (c) It is our moral duty to care for the well-being of all species i.e., our biological legacy. (d) All of these

Given below are four statements (i)-(iv). Which two of the following statements are correct ? (i) It is estimated that more than 70 percent of the world livestock population is in India and China. (ii) Stringent cleanliness and hygiene (both of the cattle and the handless) are of paramount importance while milking, storage and transport of the milk and products. (iii) Out-breeding is the breeding between animals of the same breed only. (iv) Corsses between different breeds is called inbreeding.

In the tropical rainforest, the majority of trees have showy animal-pollinated flowers. In temperate forests the majority of trees are wind pollinated. Which factors best explain these contrasting patterns ? (i) Wind is rare in tropical forests. (ii) Because of high species diversity in the tropics, individuals of trees species are often widely separated making wind an inefficient means of pollen dispersal. (iii) More opportunities for coevolved mutualisms exist in tropical forests because of the high diversity of animal species. (iv) Trees in tropical forests are mostly evergreen and year-round leaf canopies impede pollen dispersal by wind. (v) Flowering in tropical forests occurs over a short period of time when wind is absent. (a) (i) , (ii) and (v) (b) (i),(iii) and (v) (c) (ii), (iii) and (iv) (d) (ii) and (iv)

Offsprings of oviparous animal are at greater risk of survival as compared to those of viviparous animals because