Q1
In plants inulin and raphides
Correct Answer
Option A
Solution
(a) Inulin (polysaccharide) and raphides (calcium oxalate crystals) are reserve materials in plants.
Mineral Nutrition
Q2
Which aquatic fern performs nitrogen fixation?
Correct Answer
Option A
Solution
(a) Azolla fixes nitrogen via its symbiont Anabaena azollae.
Q3
Enzyme involved in nitrogen assimilation
Correct Answer
Option A
Solution
(a) Nitrogenase converts atmospheric N2 to NH3.
Q4
Which one of the following mineral elements plays an important role in biological nitrogen fixation?
Correct Answer
Option A
Solution
(a) Molybdenum is component of nitrogenase and nitrate reductase.
Q5
A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is
Correct Answer
Option D
Solution
(d) Anabaena azollae lives in leaf cavities of Azolla and fixes nitrogen.
Q6
Nitrogen fixation in root nodules of Alnus is brought about by:
Correct Answer
Option C
Solution
(c) Frankia fixes nitrogen in root nodules of Alnus (non-legume).
Q7
Which of the following is a symbiotic nitrogen fixer?
Correct Answer
Option B
Solution
(b) Frankia is symbiotic nitrogen fixer in root nodules of non-legume plants.
Q8
One of the free-living, anaerobic nitrogen fixer is:
Correct Answer
Option B
Solution
(b) Rhodospirillum is free-living anaerobic (photosynthetic) nitrogen fixer.
Q9
The association between blue-green algae and fungi occurs in
Correct Answer
Option A
Solution
(a) In lichens, the association between an algae and a fungus is considered to be a symbiotic one.
In this association, algae provides food to fungi.
Q10
Mycorrhiza is a symbiotic relationship between roots of higher plants and
Correct Answer
Option B
Solution
(b) Symbiotic relationship between roots of higher plants and fungi is called mycorrhiza, e.g.
Pinus roots are associated with fungal hyphae.
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