Biology today

129. Which of the following are false statements?


130. respiratory climacteric is related to ethane, a
     gaseous hormone.


131. micropropagation is assisted by ethephon and kinetin.


132. cytokinin shows “richmond Lang effect” by
     promoting nutrient mobalisation.


133. Earlier aBa was identified as inhibitor-B, dormin and
     abscission II.


134. apical dominance is caused by ck.
     (a) 1 and 5 (b) 1 and 4
     (c) 3 and 5 (d) 1, 2 and 5


135. chemical used to increase production of cucumber crop
     is
     (a) aBa (b) Pma
     (c) ethephon (d) Ga 3.


136. In S-shaped curve, the growth is highest in which

phase?

(a) Lag phase (b) asymptote phase

(c) Exponential phase (d) None of these

132. If to form Bonsai, half of the roots of a plant are removed,
     then its transpiration will
     (a) increased to double
     (b) becomes almost half
     (c) abruptly increases by many folds
     (d) remain unchanged.


133. root nodules maintain O 2 free environment by which of

the following chemicals?

(a) Porphyrin (b) Leghaemoglobin

(c) Leghaemocyanin (d) Nitrogenase

134. Which of the following is a true statement?

(a) mn++ is a macronutrient.

(b) In root nodule of legume to form one Nh 3 16 aTP

are consumed.

(c) Nitrobacter is a denitrifying chemoautotroph.

(d) Some marshy plants eat insects as a source of N 2

because marshes are rich in Pseudomonas and

Thiobacillus.

135. most important mineral for nitrogen fixation is

(a) mn++ (b) mg++

(c) mo (d) none of these

136. Soyabean transport ureides from root nodules to various
     plant parts as fixed nitrogen, which
     (a) is a nitrogen and phosphorus rich compounds
     (b) carries high NO 3 than carbohydrates

(c) carries high N : c ratio

(d) is highly soluble in organic compounds, so,

transported through xylem.

137. anaerobic nitrogen fixing bacteria is
     (a) Rhodospirillum (b) Azotobacter
     (c) Beijerinckia (d) Aulosira


138. Which of the following is a wrong statement?
     (a) Boron is required for ca++ uptake and utilisation.
     (b) Excess mn++ induces deficiency of Fe and mg.
     (c) Zn++ is an activator of alcohol dehydrogenase.
     (d) cysteine is a sulphur containing essential amino
     acid.


139. Which of the following is a wrong match?
     (a) Whiptail of crucifers – mo deficiency
     (b) Exanthema of citrus – cu deficiency
     (c) Fe and mo – Tracer elements
     (d) ca++ - Non-mobile mineral


140. common symptom due to deficiency of ca, mg, cu and
     K is
     (a) chlorosis followed by anthocyanin synthesis
     (b) stunting and leaf curling
     (c) necrosis in leaf tissue
     (d) none of these.


141. Which of the following is a wrong statement?
     (a) In etiolation plant become abnormally tall and
     yellow due to deficiency of mg++ and Fe+++.
     (b) most critical element for plant growth is nitrogen.
     (c) root nodule formation is stimulated by auxin
     produced by plant and ck produced by bacteria.
     (d) Limiting nutrient for both natural and agricultural
     ecosystem is nitrogen.


142. Which one of the following symptoms is not due to
     manganese toxicity in plants?
     (a) calcium translocation in shoot apex is inhibited.
     (b) Deficiency in both iron and nitrogen is induced.
     (c) appearance of brown spot surrounded by chlorotic
     veins.
     (d) None of these

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