- Tensor tympani and stapedius muscles are present in
(a) external ear (b) middle ear
(c) inner ear (d) cochlea and utriculus.
- Which event causes depolarisation of neuron?
(a) Influx of K+ (b) Influx of Na+
(c) Influx of any positively charged on
(d) Efflux of negatively charged organic ions
- Absence of enterokinase causes
(a) no conversion of chymotrypsinogen into chymotrypsin
(b) no secretion of gastric juice
(c) more secretion of gastric juice and gastric motility also
increases
(d) inhibition in release of bile juice from gall bladder.
- In our tissues dissociation of oxyhaemoglobin occurs due to the
(a) low O 2 concentration and high CO 2 concentration
(b) low concentration of O 2 and CO 2 both
(c) high concentration of O 2 and CO 2 both
(d) high O 2 concentration and low CO 2 concentration.
- After organ transplantation cyclosporin A is given to the patient
because
(a) it is a immune enhancer drug
(b) It is an immunosuppressive drug
(c) it is an immunologically inert substance
(d) it increases the count of WBCs in recipient.
- Head of cockroaches can move in all directions because
(a) tentorium of head is very flexible which provide greater mobility
(b) prothorax forms an extension which behaves as flexible neck
(c) head capsule forms an extension which behaves as flexible neck
(d) whole neck is made up of arthrodial membrane.
- What is the location of troponin in the process of muscle
contraction?
(a) Attached to myosin filament
(b) Attached to tropomyosin
(c) Attached to myosin cross-bridges
(d) Attached to T-tubule
- The permissible use of technique amniocentesis is for
(a) detecting sex of the unborn foetus
(b) artificial insemination
(c) transfer of embryo into the uterus of a surrogate mother
(d) detecting any genetic abnormality.
- Introduction of genetically modified food is not desirable because
(a) it will affect economy of developing countries
(b) the products are less tasty
(c) they are costly
(d) they could affect the biodiversity and environment.
- The process of introduction of weakened inactivated pathogen into
human body is called
(a) immunisation (b) vaccination
(c) attenuation (d) none of these.
- Genetic material found in human immuno deficiency virus (HIV) is
(a) double-stranded RNA
(b) two strands of single-stranded RNA
(c) double-stranded DNA
(d) single-stranded DNA.
- Identify the parts marked as A , B and C in the given figure showing
ATP synthesis through chemiosmosis.
A B C
(a) Thylakoid lumen F 0 F 1
(b) Thylakoid lumen F 1 F 0
(c) Chloroplast lumen F 0 F 1
(d) Chloroplast lumen F 1 F 0
- A test tube containing molasses solution and yeast is kept in a
warm place overnight. The gas collected from this mixture
(a) extinguishes the flame
(b) bursts into flame when ignited
(c) turns lime water milky
(d) both (a) and (c).
- Which of the following does not affect the genetic variation in a
population?
(a) Chromosomal mutation (b) Gene migration
(c) Genetic drift (d) Balanced polymorphism
- Which of the following shows the correct sequence of steps of
plant tissue culture?
(a) Sterilisation → hardening → selection of explant →
inoculation → regeneration → plantlet transfer
(b) Selection of explant → inoculation → regeneration →
sterilisation → hardening → plantlet transfer
(c) Selection of explant → sterilisation → inoculation →
regeneration → hardening → plantlet transfer
(d) Hardening → sterilisation → selection of explant →
inoculation → regeneration → plantlet transfer
- A jacket of sterile cells around the sperms and eggs is an
adaptation to life on land, in
(a) Riccia (b) Fucus
(c) Laminaria (d) Ulothrix.
- Given structural formula is correctly identified alongwith its related
function by which of the following options?
HO
