For various cellular processes, following molecules need to be transported from the site of synthesis to the site of activity. 

i. Nucleotides 

ii. tRNA 

iii. Histones 

iv. Deoxyribose sugar 

Which molecules from the above are transported from cytoplasm to nucleus? 

(a) i and ii 

(b) i and iii 

(c) ii and iv 

(d) i and iv

Three types of mutations are listed below: 

I. Chromosomal mutation 

II. Gene mutation 

iii. Somatic mutation Which of the following statements describe them correctly? 

(a) i & ii both describe the same phenomenon 

(b) iii will always result in abnormal cell growth leading to cancer. 

(c) Only gene mutation can alter the DNA sequence. 

(d) Gene duplication is a type of chromosomal mutation.

Which of the diagrams given below will best represent stabilising selection In a population with continuous variations? X axis represents phenotype with quantitative variation while Y axis represents frequency of individuals,

The X in the accompanying diagram is:

(a) amniotic egg 

(b) bipedal locomotion 

(c) diapsid skull 

(d) four chambered heart

Which ofthe following is a mismatched pair? 

(a) Lady’s finger – Capsule 

(b) Banana – Berry 

(c) Date – Drupe 

(d) Maize – Caryopsis

Which of the following assist in the locomotion of earthworm? 

i. Muscles in the body wall 

ii. Coelomic fluid 

iii. Septa 

iv. Setae 

(a) i, ii, iii and iv 

(b) Only i, ii and iv 

(c) Only ii, iii and iv 

(d) Only i and iv

Which of the following processes requires energy? 

(a) Movement of calcium into a cell. 

(b) Secretion of mucus by a cell 

(c) Entry of oxygen into a cell. 

(d) Water absorption by a cell.

Eastern and Western Meadow Larks look almost the same and inhabit the same areas of Prairie. They recognize mates of their own species by distinctive courtship songs: This is an example of type of pre-zygotic isolation. 

(a) Ecological 

(b) gametic 

(c) mechanical 

(d) behavioural

The following pedigree traces the trait calIed achondroplasia, a form of dwarfism. Which of the following hypothesis can be supported by given pedigree?

(a) The trait is due to dominant allele. 

(b) The trait is due to recessive allele. 

(c) The trait is sex linked. 

(d) Given information is not sufficient to hypothesize the situation.

 A white footed mouse ‘Peromyscus leucopus’, a common rodent of South America can maintain core body temperature near 37ºC even if the air temperature is below 0ºC. This capacity gradually increases from birth to adulthood. Which graph correctly depicts ability of isolated individual animals to thermoregulate during their developmental stages? 

Note : Y axis depicts the temperature at which the animal can thermoregulate.