(iii) Endosperm represents female gametophyte.
(a) Statements (i) and (ii) are correct
(b) Statements (ii) and (iii) are correct
(c) Statements (i) and (iii) are correct
(d) Statements (i), (ii) and (iii) are correct
- Excitation of chlorophyll molecule due to light is a
(a) photo-oxidation reaction
(b) endergonic reaction
(c) thermochemical reaction
(d) photochemical reaction.
- Frameshift mutation occurs when
(a) base is substituted
(b) base is deleted or added
(c) anticodons are absent
(d) none of these.
- Which one of the following categories of animals, is correctly
described with no single exception in it?
(a) All reptiles possess scales, have a three chambered
heart and are cold blooded (poikilothermal).
(b) All bony fishes have four pairs of gills and an operculum
on each side.
(c) All sponges are marine and have collared cells.
(d) All mammals are viviparous and possess diaphragm for
breathing.
- Mendel was not able to say anything about recombination
and crossing over because
(a) he did not have a large and strong microscope
(b) he choose only contrasting characters
(c) traits he choose, were not linked and present on
different chromosomes or were far apart
(d) traits he choose had no genes.
- Select the mismatched pair out of the following.
(a) Rhizome – Dryopteris, Nelumbo nucifera
(b) Corm – Crocus sativus, Amorphophallus
(c) Sucker – Curcuma domestica, Zingiber officinale
(d) Tuber – Helianthus tuberosus, Solanum tuberosum
- Which one of the following four secretions is correctly
matched with its source, target and nature of action?
Secretion Source Target Action
(a) Gastrin Stomach
lining
Oxyntic cells Production of
HCl
(b) Inhibin Sertoli
cells
Hypoth-
alamus
Inhibition of
secretion of
gonadotropin
releasing
hormone
(c) Enterokinase Duodenum Gall bladder Release of bile
juice
(d) Atrial
Natriuretic
Factor
(ANF)
Cardiocytes of
atria
Juxta-
glomerular
apparatus
(JGA)
Inhibition of
release of renin
- Pollen grains are well preserved as fossils because of the
presence of
(a) sporopollenin (b) lignin
(c) suberin (d) pectin.
- Which of the following is incorrect statement about the
plasmids?
(a) It is the extra chromosomal DNA in bacteria.
(b) It is not an integral part but inert genetic material.
(c) Host chromosome can be integrated with the
plasmid.
(d) Transfer of plasmid can be done from one cell to
another without killing the host.
- Cu ions released from copper-releasing intrauterine devices
(IUDs)
(a) make uterus unsuitable for implantation
(b) decrease phagocytosis of sperms
(c) suppress sperm motility
(d) prevent ovulation.
- What is the source of Ti plasmid which is used as a cloning
vector to deliver the desirable genes into plant cells?
(a) Agrobacterium tumefaciens
(b) Thermophilus aquaticus
(c) Pyrococcus furiosus
(d) Aedes aegypti
- In a condensed schematic
RuMP
3 PGA
1, 3 Di PGA
PGA
RuBP Unstable compound
Glucose
A
B
C
D
representation of dark
reaction of photosynthesis
given below, steps are
indicated by alphabets.
Select the option where the
alphabets are correctly
identified.
(a) A-CO 2 fixation, B-Reduction, C-Phosphorylation,
D-Regeneration
(b) A-Regeneration, B-CO 2 fixation, C-Reduction,
D-Phosphorylation
(c) A-CO 2 fixation, B-Phosphorylation, C-Reduction,
D-Regeneration
(d) A-CO 2 fixation, B-Phosphorylation, C-Regeneration,
D-Reduction
- Specimen A is an example of symbiotic association between
B and C. Both B and C have cell wall, B lacks photosynthetic
ability while C is capable of it. Identify A, B and C.
A B C
(a) Lichen Algae Fungi
(b) Lichen Fungi Algae
(c) Lichen Bacteria Algae
(d) Mycorrhiza Fungi Algae
- Thermococcus, Methanococcus and Methanobacterium
exemplify
(a) bacteria whose DNA is relaxed or positively
supercoiled but which have a cytoskeleton as well as
mitochondria
(b) bacteria that contain a cytoskeleton and ribosomes
