Which one of the following is the most efficient packing arrangement?
(a) AAA type in 2D
(b) AAA type in 3D
(c) ABAB type in 2D
(d) ABCABC type in 3D

Which of the following types of metal form the most efficient catalysts?

Which of the following vertebra is amphicoelous type in frog? (a) 3rd (b) 9th (c) 8th (d) 10th

Fraction of empty space in ABAB type arrangement in 3D

Which of the following cytokinesis after meiosis in PMCs is considered as advanced type? (a) Simultaneous type in monocots (b) Successive type in monocots (c) Successive type in dicots (d) Simultaneous type in dicots

In which type, the stomata are present exclusively on the upper surface of the leaves (a) Potato type (b) Potamogeton type (c) Barely type (d) Water Lily type

In the diagram of types of placentation a, b, c and d represent

Which of the following given statements is/are incorrect- (a) there are five unpaired electrons in (n-1)d subshell of Fe^(3+) , (b) the number of nodal planes in 4d_(xy) orbital is one, (c) in Ag atom 23 electrons have a spin of one type and 24 of the opposite type

Mark the incorrect pair (w.r.t sex determination) (a) ZW-ZZ type - Fishes (b) ZO-ZZ type - Birds (c) XX-XO type - Dioscorea (d) XX-XY type - Melandrium

The power of a lens is -5 D. Name the type of lens.

Which of the following is/are not characteristic features of Asteraceae (A) Cypsela type of fruit (B) Syngenesious stamens (C) Ovary bicarpellary and superior (D) Placentation marginal (E) Head type of inflorescence