4
MCQ (Single Correct Answer)
Which one of the following symptoms is not due to manganese toxicity in plants?
A
Calcium translocation in shoot opex is inhibit
B
Deficiency in both iron and zitrogen induced
C
Appearance of brown spot surrounded by chlorotic veins
D
None of the above
5
MCQ (Single Correct Answer)
Reaction carried out by $\mathrm{N}_2$ fixing microbes include
(a) $2 \mathrm{NH}_3+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{NO}_2^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_2 \mathrm{O}$ ............ (i)
(b) $2 \mathrm{NO}_2+\mathrm{O}_2 \longrightarrow 2 \mathrm{NO}_3$ ............. (ii)
Which of the following statements about these equations is not true?
A
Step (i) is carried out by Nitrosomonas or Nitrococcus
B
Step (ii) is carried out by Nitrobacter
C
Both steps (i) and (ii) can be called nitrification
D
Bacteria carrying out these steps are usually photoautotrophs
6
MCQ (Single Correct Answer)
With regard to the biological nitrogen fixation by Rhizobium in association with soyabean, which one of the following statement/ statements does not hold true.
A
Nitrogenase may require oxygen for its functioning.
B
Nitrogenase is Mo-Fe protein
C
Leg-haemoglobin is a pink coloured pigment.
D
Nitrogenase helps to convert $\mathrm{N}_2$ gas into two molecules of ammonia.
7
MCQ (Single Correct Answer)
Match the element with its associated functions/roles and choose the correct option among given below
| A. | Boron | 1. | Splitting of $\mathrm{H}_2 \mathrm{O}$ to liberate $\mathrm{O}_2$ during photosynthesis |
|---|---|---|---|
| B. | Manganese | 2. | Needed for synthesis of auxins |
| C. | Molybdenum | 3. | Component of nitrogenase |
| D. | Zinc | 4. | Pollen germination |
| E. | Iron | 5. | Component of ferredoxin |
A
$1,2,3,4,5$
B
$4,1,3,2,5$
C
$3,2,4,5,1$
D
$2,3,5,1,4$
8
MCQ (Single Correct Answer)
Plants can be grown in (Tick the incorrect option)
A
soil with essential nutrients.
B
water with essential nutrients.
C
either water or soil with essential nutrients.
D
water or soil without essential nutrients.