Heterosporous pteridophytes show certain characteristics,
which are precursor to the ‘seed habit’ in gymnosperms. One
of such characteristics is
(a) presence of vascular tissues
(b) external water required for fertilisation
(c) presence of embryo stage
(d) development of embryo inside the female gametophyte.
The scientific name of Java man is
(a) Homo habilis
(b) Homo sapiens neanderthalensis
(c) Homo erectus erectus
(d) Australopithecus boisei.
Identify the incorrect statement regarding retrovirus?
(a) Its DNA has no role in its life cycle.
(b) There is a gene for RNA dependent DNA polymerase.
(c) Genetic material is RNA.
(d) None of these.
Graft between individuals of different species is called
(a) xenograft (b) isograft
(c) autograft (d) allograft.
Taxonomic hierarchy refers to
(a) stepwise arrangement of all categories for classification
of plants and animals
(b) a group of senior taxonomists who decide the
nomenclature of plants and animals
(c) a list of characteristics of organisms ranging from less
important to most important for taxonomic purposes
(d) classification of a species based on fossil record.
In which one of the following, the genus name, its two
characters and its phylum are not correctly matched?
Genus name Characters Phylum
(a) Pila (i) Body segmented Mollusca
(ii) Mouth with radula
(b) Asterias (i) Spiny skinned Echinodermata
(ii) Water vascular system
(c) Sycon (i) Pore bearing Porifera
(ii) Canal system
(d) Periplaneta (i) Jointed appendages Arthropoda
(ii) Chitinous exoskeleton
Unidirectional transmission of a nerve impulse through nerve
fibre is due to the fact that
(a) nerve fibre is insulated by a medullary sheath
(b) sodium pump starts operating only at the cyton and
then continues into the nerve fibre
(c) neurotransmitters are released by dendrites and not by
axon endings
(d) neurotransmitters are released by the axon endings
and not by dendrites.
Given below is a pedigree chart of a family with five children.
It shows the inheritance of attached ear-lobes as opposed to
the free ones. The squares represent the male individuals and
circles, the female individuals. Which one of the following
conclusions is correct?
Attached
Ear - lobe
Free
Ear - lobeMale
FemaleKey :(a) The parents are homozygous recessive.
(b) The trait is Y-linked.
(c) The parents are homozygous dominant.
(d) The parents are heterozygous.- In mammals, the opening of inferior vena cava in the right
auricle is guarded by
(a) Mitral valve (b) Eustachian valve
(c) tricuspid valve (d) Thebasian valve. - Which type of ecosystem will be present in a place if there
is an annual rainfall of over 250 cm?
(a) Tropical forests (b) Grasslands
(c) Deciduous forests (d) Temperate forests - Study the given statements about gymnosperms and select
the correct option.
(i) Mode of fertilisation is siphonogamy.
(ii) Male and female cones are borne on same tree in
Pinus.