(d) Stomatal opening is under the control of
turgor pressure of the guard cells. Turgor pressure
is controlled by the movement of minerals and
sugar molecules in the guard cells.
(c)
(b) Kurasawa was investigating the mechanism
by which the fungal pathogen Gibberela fujikorai
led the foolish seedling disease in rice plants
infected with this pathogen.
(c) Cycas show symbiotic association of nitrogen
fixing cyanobacteria in coralloid roots.
(d)
(c) Haemophilia is more commonly seen in
human females as this disease is caused because
of X-linked recessive mutation.
(d)
A biennial is a plant that grows for two years
before setting its seed and then dying. In the first
year the plant grows a healthy root system, leaves
and a short stem before becoming dormant over
the winter months.
In the second year the plant grows quickly before
flowering, setting seed and then dying.
Some of the more common bienniels are
Foxgloves, Evening Primroses etc.
A perennial is a plant that lives for more than two
years. The plant dies back each winter; however
the root system survives the winter months so
that the plant can regrow the following year.
Some more common plants in this group are
Lupins etc.
(c) Prophase I of meiosis. This is the complex and
longest phase. It is divided into five substages.
(d)
37. (c) Gel electrophoresis is a technique generally
used in laboratories to separate charged molecules
such as DNA, RNA, and proteins according to
their size.
38. (c) Vector is a DNA molecule used as a vehicle to
artificially carry foreign genetic material into
another cell where it can be replicated or
expressed. Plasmid have that property and hence
it’s a vector.
39. (c) Stomata is an opening present in epidermal
region of leaf used for gas exchange.
40. (a) Methane is a major component of gobar gas.
41. (a) Plants capable of C 4 photosynthesis carry on a
more efficient form of photosynthesis. For C 4 type
plants, 1) the light saturation point is higher and
2) the light compensation point is lower than for
C 3 plants.
42. (c) Deserts have very hot days and very cold
nights. Due to the bare plant cover, the soil of
desert is much more exposed to these fluctuations
as compared to that of other areas. During day
time the soil becomes hot and in night it frequently
becomes cool.
43. (c) Human insulin consists of two short
polypeptides chains linked together by disulphide
bridges.
44. (d) Water channel consists of eight different types
of aquaporins.
45. (c) In Mirabilis jalapa, hybrid between red and
white flowered plants produces pink flowers in
the F1 generation which is a fusion of red and
white condition. This result shows that both red
and white flowered condition is not dominant.
Therefore, it is due to incomplete dominance.
