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Total questions: 20
Worksheet time: 10mins
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?
Leghaemoglobin scavenges oxygen and it is pinkish in colour.
Nodules act as sites for nitrogen fixation.
The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3 .
Nitrogenase is insensitive to oxygen.
Study the cycle shown below and select the option which gives the correct word for all the four blanks A, B, C and D
A: Nitrification, B: Ammonification, C: Animals, D: Plants
A: Denitrification, B: Ammonification, C: Plants, D: Animals
A: Nitrification, B: Denitrification, C: Animals, D: Plants
A: Denitrification, B: Nitrification, C: Plants, D: Animals
An element playing important role in nitrogen fixation is
Molybdenum
Copper
Manganese
Zinc
The free-living, anaerobic nitrogen-fixer is
Beijerinckia
Rhodospirillum
Rhizobium
Azotobacter
Which one of the following is not an essential mineral element for plants while the remaining three are?
Iron
Manganese
Cadmium
Phosphorus
The function of leghaemoglobin in the root nodules of legumes is
Oxygen removal
Nodule differentiation
Expression of nif gene
Inhibition of nitrogenase activity
Deficiency symptoms of nitrogen and potassium are visible first in
Senescent leaves
Young leaves
Roots
Buds
Mineral known to be required in large amounts for plant growth include:
Phosphorus, potassium, sulphur, calcium
Calcium, magnesium, manganese, copper
Potassium, phosphorus, selenium, boron
Magnesium, sulphur, iron, zinc
Chlorosis, i.e., loss of chlorophyll leading to yellowing in leaves, is caused by the deficiency of
N, K, Mg
S, Fe, Zn
Mn, Mo, Mg
All of these
The two elements responsible for splitting of H2O to liberate O2 during photosynthesis are
Mn and Mo
Ca and Mg
Mn and Cl
Mg and Cl
Assertion: Nitrogen fixing enzyme in legume root nodules functions in Anaerobic enviornment.
Reason: Anaerobic environment is provided by legheamoglobin.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion
Assertion is true, but Reason is false
Both Assertion and Reason is false
Consider the following statements regarding Hydroponics.
I. It is a technique of growing plants in a nutrient Solution
II. It requires purified water and mineral nutrient salts.
III. It has been successfully employed as a technique for the commercial production of tomato, seedless cucumber and lettuce.
Mark the option depicting all correct statements.
Only I
Only II
II and III only
I, II and III
Transamination reaction involves,
the transfer of amino group from one amino acid to the keto group of a keto acid.
reaction of ammonia with glutamic acid to form α – ketoglutaric acid
protonation of dinitrogen
conversion of dinitrogen to nitrate
The element is said to be _________ when present below the critical concentration.
Deficient
Excess
Toxic
None of the above
Bivalent ion known to help plants in synthesis of IAA is
Ca2+
Zn2+
MoO22+
Mn2+
I. Component of chlorophyll
II. Helps to maintain ribosome structure
III. Activator for Rubisco and Pepco
IV. Activates the enzymes of respiration and photosynthesis
V. Involved in synthesis of nucleic acids
The above roles are played by –
Ca+2
Mg+2
Mn+2
Cl–
Nitrifying bacteria
Convert free nitrogen to nitrogen compounds
Convert proteins into ammonia
Reduce nitrates to free nitrogen
Oxidize ammonia to nitrates
Which one is the major constituent of proteins, nucleic acids, vitamins and hormones
P
N
K
S
Which of the following is a component of vitamin (thiamine, biotin), Acetyl CoA, cysteine, methionine and ferrerdoxin?
Fe
S
Co
K
A plant requires magnesium for
Holding cells together
Protein synthesis
Chlorophyll synthesis
Cell wall development
