Asymptote in a logistic growth curve is obtained when :
(1) K < N
(2) The value of 'r' approaches zero
(3) K = N
(4) K > N

The vascular cambium normally gives rise to :
(1) Periderm
(2) Phelloderm
(3) Primary phloem
(4) Secondary xylem

In case of poriferans, the spongocoel is lined
with flagellated cells called :
(1) Mesenchymal cells
(2) Ostia
(3) Oscula
(4) Choanocytes

Fruit and leaf drop at early stages can be
prevented by the application of
(1) Gibberellic acid
(2) Cytokinins
(3) Ethylene
(4) Auxins

A gene whose expression helps to identify transformed
cell is known as
(1) Structural gene
(2) Selectable marker
(3) Vector
(4) Plasmid

The final proof for DNA as the genetic material came
from the experiments of
(1) Hargobind Khorana
(2) Griffith
(3) Hershey and chase
(4) Avery, Mcleod and McCarty

With reference to factors affecting the rate of
photosynthesis, which of the following statements is
not correct ?
(1) Tomato is a greenhouse crop which can be grown
in ``CO_2``-enriched atmosphere for higher yield
(2) Light saturation for ``CO_2`` fixation occurs at 10%
of full sunlight
(3) Increasing atmospheric ``CO_2`` concentration up to
0.05% can enhance ``CO_2`` fixation rate
(4) ``C_3`` plants respond to higher temperatures with
enhanced photosynthesis while ``C_4`` plants have much lower
temperature optimum

The association of histone H1 with a nucleosome indicates :
(1) The DNA double helix is exposed
(2) Transcription is occurring
(3) DNA replication is occurring
(4) The DNA is condensed into a Chromatin Fibre

GnRH, a hypothalamic hormone, needed in reproduction, acts on
(1) Posterior pituitary gland and stimulates secretion of LH and relaxin
(2) Anterior pituitary gland and stimulates secretion of LH and oxytocin
(3) Anterior pituitary gland and stimulates secretion of LH and FSH
(4) Posterior pituitary gland and stimulates secretion of oxytocin and FSH

DNA fragments are
(1) Either positively or negatively charged depending on their size
(2) Positively charged
(3) Negatively charged
(4) Neutral

Which of the following options gives the correct sequences of events during mitosis ?
(1) condensation arrangement at equator centromere division segregation telophase
(2) condensation nuclear membrane disassembly crossing over segregation telophase
(3) condensation nuclear membrance disassembly arrangement at equator centromere division
segregation telophase
(4) condensation crossing over nuclear membrane disassembly segregation telophase

Lungs are made up of air-filled sacs, the alveoli.
They do not collapse even after forceful expiration,
because of :
(1) Expiratory Reserve Volume
(2) Residual Volume
(3) Inspiratory Reserve Volume
(4) Tidal Volume

Which one of the following statements is correct with reference to enzymes ?
(1) Holoenzyme = Coenzyme + Co-factor
(2) Apoenzyme = Holoenzyme + Coenzymes
(3) Holoenzyme = Apoenzyme + Coenzyme
(4) Coenzyme = Apoenzyme + Holoenzyme

Which of the following are not polymeric ?
(1) Lipids
(2) Nucleic acids
(3) Proteins
(4) Polysaccharides