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

The sugar glider and flying squirrel belong to two different groups of mammals, but they have both evolved bushy tails and flaps of skin that help them exploit their forest environments more efficiently. This pattern of evolution is an example of: 

(a) character displacement 

(b) adaptive radiation. 

(c) convergent evolution 

(d) divergent evolution

A littoral gastropod will have thickest shell when it is located at the 

(a) high tide marks on a rock beach. 

(b) greatest depth in a sand beach. 

(c) low tide marks on a mud beach. 

(d) bottom of a rock pool

A biologist was given two animal cell populations, X and Y. When he subjected them to culturing under similar conditions of availability of nutrients, growth factors and substratum he found the growth of sample X stopped after the available substratum was covered while the growth of sample Y continued so that multilayered mass was formed. The cells in sample X and Y respectively, are most likely to be: 

(a) epithelial cells and leucocytes 

(b) germinal cells and muscle cells 

(c) normal cells and cancer cells 

(d) diploid cells and polyploid cells

Three genes A, Band C are involved in determination of skin colour. If a couple with fair skin colour, produced a child with dark skin colour, then the genotype of the parents most probably can be: 

(a) Aabbcc x aaBbcc 

(b) AAbbcc x aabbcc 

(c) Aabbcc x aaBBcc 

(d) AaBbcc x aaBbCc

The photosynthetic pigment that provides effective photoprotection is : 

(a) chlorophyll b 

(b) chlorophyll e 

(c) phycobilins 

(d) carotenoids

Which ofthe following is a mismatched pair? 

(a) Lady’s finger – Capsule 

(b) Banana – Berry 

(c) Date – Drupe 

(d) Maize – Caryopsis

Which process of cell ingestion is shown in diagram below?

(a) Exocytosis 

(b) Pinocytosis 

(c) Phagocytosis 

(d) Macrophage engulfing an infectious agent

Sclerides are the sclerenchyma cells with very thick secondary wall deposits and provide echanical support. In which of the following plant organs one would expect to find abundant sclerides? 

(a) Underground tuberous roots. 

(b) Leaves of floating hydrophyte. 

(c) Flower petals of mesophytes. 

(d) Petioles of xerophytic plant.

Five leaf discs of a hydrophyte were submerged in 0.2% sodium bicarbonate solution (containing a small quantity of soap) and another five discs were submerged in plain water. Which of the following will happen? 

(a) Discs in bicarbonate solution rise while those in plain water remain submerged. 

(b) Discs in bicarbonate solution and in plain water, both remain submerged. 

(c) Discs in plain water rise earlier than those in bicarbonate solution. 

(d) Discs in bicarbonate solution and in plain water, both rise at the same time.