- Based on cellular mechanisms there are two major types
of regeneration found in the animals. Which one of the
following is the correct example of the type mentioned?
(a) Morphallaxis – Regeneration of two transversely cut
equal pieces of a Hydra into two small Hydra.
(b) Epimorphosis – Replacement of old and dead
erythrocytes by the new ones
(c) Morphallaxis – Healing up of a wound in the skin
(d) Epimorphosis – Regeneration of crushed and filtered
out pieces of a Planaria into as many new planarians
- Which of the following statements is correct regarding short
day plants (SDPs)?
(a) They can flower in complete darkness if supplied with
exogenous nutrients.
(b) They are the same as long day plants.
(c) They do not have a critical photoperiod.
(d) All of these
- Severe Acute Respiratory Syndrome (SARS)
(a) is caused by Pneumococcus pneumoniae
(b) is caused by a corona virus
(c) is an acute form of asthma
(d) is characterised by replacement of lung tissue by
fibrous connective tissue.
- Myxomycetes are
(a) saprobes or parasites, having mycelia, asexual
reproduction by fragmentation, sexual reproduction by
fusion of gametes
(b) slimy mass of multinucleate protoplasm, having
pseudopodia-like structures for engulfing food,
reproduction through fragmentation or zoospores
(c) prokaryotic organisms, cellular or acellular, saprobic or
autotrophic, reproduce by binary fission
(d) eukaryotic, single-celled or filamentous, saprobic or
autotrophic, asexual reproduction by fusion of two
cells or their nuclei.
- Select the correct explanation for the labels A, B, C and D.
A B
C
D
(a) A represents the fertilised zygote.
(b) B represents the stage of morula formation.
(c) C represents the blastocyst.
(d) D represents the blastocyst implantation.
- Which one of the following statement pertaining to pollutants
is correct?
(a) DDT is a non-biodegradable pollutant.
(b) Excess fluoride in drinking water causes osteoporosis.
(c) Excess cadmium in drinking water causes black foot
disease.
(d) Methylmercury in water may cause itai itai disease.
- In the prothallus of a vascular cryptogam, the antherozoids
and eggs mature at different times. As a result
(a) there is high degree of sterility
(b) one can conclude that the plant is apomictic
(c) self fertilisation is prevented
(d) there is no change in success rate of fertilisation.
- Stink gland is found in
(a) 4 th and 5th terga of cockroach
(b) 5 th and 6th terga of cockroach
(c) 5 th and 6th sterna of cockroach
(d) 4 th and 5th sterna of cockroach.
- A pome fruit is said to be false because
(a) the pericarp is inconspicuous
(b) the endocarp is prominent
(c) the fruit is present in fleshy edible thalamus
(d) the pericarp is divided into epicarp, mesocarp and
endocarp.
- In India, we find mangoes with different flavours, colours,
fibre content, sugar content and even shelf-life. The large
variation is on account of
(a) species diversity
(b) induced mutations
(c) genetic diversity
(d) hybridisation.
- In which one of the following sets of three items each belong
to the category mentioned against them?
(a) Lysine, glycine, thiamine –– amino acids
(b) Myosin, oxytocin and gastrin –– hormones
(c) Rennin, helicase and hyaluronidase –– enzymes
(d) Optic nerve, oculomotor, vagus –– sensory nerves
- Which one of the following statements pertaining to plant
structure is correct?
(a) Cork lacks stomata, but lenticels carry out
transpiration.
(b) Passage cells help in transfer of food from cortex to
phloem.
(c) Sieve tube elements possess cytoplasm but no nuclei.
(d) The shoot apical meristem has a quiescent centre.
- In the development of the human body, the ectoderm is
responsible for the formation of
(a) sweat glands (b) lens of the eye
(c) nervous system (d) all of these.
