Biology today

143. Identify the labels in the given flow diagram which links

the major nitrogen pools.

Atmospheric N 2

NH (^3) DENO 2
C
Soil 'N' Pool
NO 3
Biological
N -fixation 2
Decaying biomass
A Uptake
Plant biomass
Animal biomass
Industrial
N -fixation 2
Electrical
N -fixation 2
B
(a) a-Nitrification, B-ammonification, c-Nitrobacter,
D-Nitrosomonas, E-Denitrification
(b) a-ammonification, B-Denitrification, c-Nitrification,
D-Nitrosomonas, E-Nitrobacter
(c) a-Denitrification, B-Nitrobacter, c-Nitrification,
D-Nitrosomonas, E-ammonification
(d) a-Nitrobacter, B-Denitrification, c-Nitrosomonas,
D-ammonification, E-Nitrification

144. Which of the following statements are correct about

mineral absorption in plants?

(a) In the initial phase, ions are taken up into the outer

space of cells, the apoplast. It is a passive process.

(b) In the final phase, ions are taken slowly into the

inner space, the symplast of cells and it is an active

process.

(c) Passive movement of the ions into the apoplast

occurs through ion channels, transmembrane

proteins, which acts as selective pores.

(d) all of the above

145. match the following columns.

Column I Column II

(a) Water splitting reaction (i)Boron

(b) Uptake and utilisation of ca2+ (ii)copper

(c) Synthesis of auxin (iii)cl–

(d) redox reaction (iv)Zinc

(a) a-(i), B-(iii), c-(ii), D-(iv)

(b) a-(iii), B-(i), c-(iv), D-(ii)

(c) a-(ii), B-(iii), c-(i), D-(iv)

(d) a-(iv), B-(ii), c-(i), D-(iii)

146. The source of nitrogen for plants is
     (a) atmospheric nitrogen
     (b) nitrogen present in soil as NO 3 –
     (c) nitrogen that comes from water
     (d) nitrogen fixed by microbes only.


147. how many of the following statements are true,
     except?
     (i) During photosynthesis h 2 O undergoes oxidation
     and cO 2 undergoes reduction.
     (ii) In hatch and Slack pathway mg++ is required for
     carboxylation step.
     (iii) assimilatory power of Z-scheme used in Blackman’s
     reaction is aTP and NaDh.
     (iv) maize, wheat and mustard are c 4 plants.
     (v) ruBiscO act as oxygenase at high temperature and
     high O 2 concentration in c 3 plants.
     (a) 2 (b) 3 (c) 1 (d) 5


148. The first step in photosynthesis is the
     (a) joining of 3-carbon atom to form glucose
     (b) formation of aTP
     (c) ionisation of water
     (d) excitation of an electron of chlorophyll by photon of
     light.


149. choose the correct combination of labelling in calvin cycle.

(A)

Carboxylation

Atmosphere

CO + HO 22

ATP + NADPH

ATP + NADP+

Sucrose, Starch

Reduction

Regeneration

ADP

ADP

CALVIN CYCLE (B)

(C)

(a) a-ruBP, B-Triose phosphate, c-PGa

(b) a-PGa, B-ruBP, c-Triose phosphate

(c) a-PGa, B-Triose phosphate, c-ruBP

(d) a-ruBP, B-PGa, c-Triose phosphate

150. Which of the following is an incorrect statement?
     (a) c 4 cycle was discovered in sugarcane.
     (b) Kranz anatomy is found in Bryophyllum and maize
     (c) 1 st acceptor of cO 2 in c 3 cycle is ruBP, a ketosugar.
     (d) Sciophytes need 18 aTP and 12 NaDPh for synthesis
     of glucose molecule.