Deep sea sponges have silicate spicules because: 

(a) precipitation of calcium carbonate is hindered by the depth. 

(b) at greater depth sequestration of silica is easier. 

(c) only silicious spicules make circulation of water through body efficient. 

(d) availability of calcium is relatively less at depth.

A pure tall pea plant (Pisum sativum) with axillary pods is crossed with dwarf pea plant with terminal pods. Out of 48 F₂ generation plants, how many will have phenotype like parents? 

(a) 18 

(b) 27 

(c) 30 

(d) 20

Which process of cell ingestion is shown in diagram below?

(a) Exocytosis 

(b) Pinocytosis 

(c) Phagocytosis 

(d) Macrophage engulfing an infectious agent

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

Consider four different striated muscles M1, M2, M3 and M4 of varying lengths L1, L2, L3 and L4. All these muscles have fibers running parallel to their longitudinal axis. Muscles M1, M2 and M4 have similar area of cross section while M3 has double than others. if L2= L3, 2*L3 = L4 and L1 =1/4 L2, the maximum force produced by a muscle will be greater in : 

(a) M1 

(b) M2 

(c) M3 

(d) M4

The gas transfer system found in Aves is represented in following figures: (Bold arrows represent blood flow while thin arrows represent air flow through respiratory stem.) 

The correct representation is in the figure:

Which of following characters are found in prokaryotes? 

(i) presence of DNA 

(ii) presence of flagella 

(iii) presence of cytoskeleton 

(iv) presence of cell wall 

(v) presence of pili 

(a) i, ii, iii, iv and v 

(b) only i, iii, and v 

(c) only ii, iii and iv 

(d) only i. ii, iv and v

Two ecological pyramids (I and II) are shown. Mark the correct statement that describes them.

(a) I is a biomass pyramid while II is a number pyramid. 

(b) I is likely to represent rain forest while II represents desert ecosystem. 

(c) I is biomass pyramid of a grassland and II is number pyramid of oceanic ecosystem. 

(d) I is an energy pyramid of rain forest and Ii is biomass pyramid of host and parasite. 

Mark the correct option that shows highest to lowest % resorption of substances from nephron: 

(a) Water > Sodium > Urea 

(b) Glucose > Water > Urea 

(c) Water > Urea > Glucose 

(d) Urea > Glucose > Sodium

In the following diagram distribution of 4 species of plants (P, Q, Rand S) along length of a geographical unit has been depicted. Which among them would best represent vegetation across a cliff?