Pollen grains can be stored for several years in liquid
nitrogen having a temperature of
(1) -120°C
(2) -80°C
(3) -196°C
(4) -160°C

The amnion of mammalian embryo is derived from
(1) ectoderm and mesoderm
(2) endoderm and mesoderm
(3) mesoderm and trophoblast
(4) ectoderm and endoderm

Which of the following structures or regions is
incorrectly paired with its function ?
(1) Medulla oblongata : controls respiration and
cardiovascular reflexes.
(2) Limbic system : consists of fibre tracts that
interconnect different
regions of brain; controls
movement.
(3) Hypothalamus : production of releasing
hormones and regulation
of temperature, hunger
and thirst.
(4) Corpus callosum : band of fibers connecting
left and right cerebral
hemispheres.

Identi fy the vertebrate group of animals
characterized by crop and gizzard in its digestive
sytstem.
(1) Amphibia
(2) Reptilia
(3) Aves
(4) Osteichthyes

Which of the following options correctly represents
the lung conditions in asthma and emphysema,
respectively ?
(1) Inflammation of bronchioles; Decreased
respiratory surface
(2) Increased number of bronchioles; Increased
respiratory surface
(3) Increased respiratory surface; Inflammation of
bronchioles
(4) Decreased respiratory surface; Inflammation of
bronchioles

Which of the following facilitates opening of stomatal aperture ?
(1) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
(2) Contraction of outer wall of guard cells
(3) Decrease in turgidity of guard cells
(4) Radial orientation of cellulose microfibrils in the cell wall of guard cells