Consider the following four statements (a–d) and select the option which includes all the correct ones only:
Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins etc.
Body weight-wise the microorganism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day.
Common button mushrooms are a very rich source of vitamin C.
A rice variety has been developed which is very rich in calcium.
Statements (III), (IV)
Statements (I), (III) and (IV)
Statements (II), (III) and (IV)
Statements (II), (III) and (IV)
D.
Statements (II), (III) and (IV)
Spirulina is a fast growing non-toxic blue-green alga rich in proteins, vitamin-B complex and minerals. It is cultivated in tanks as important traditional food. Mushrooms are rich source of vitamins proteins and minerals.
Secondary sewage treatment is mainly a
mechanical process
chemical process
biological process
biological process
C.
biological process
In secondary or biologicial treatement of municipal waste rich in sewage, the organic matter is decomposed with the help of microbes. Decomposition of oragnic matter occurs by one of the three methods- water hyacinth pod, trickling filter method and activated sludge method. After decomposition the treated water is sterilized through chlorination.
Which of the following helps in absorption of phosphorus from the soil by plants?
Rhizobium
Frankia
Anabaena
Anabaena
D.
Anabaena
Glomus is an arbuscular mycorrhizal (AM) fungi. It helps in nutrient uptake mainly the absorption of phosphorus.
Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?
Propane
Mustard gas
Marsh gas
Marsh gas
C.
Marsh gas
The decomposition of sludge by anaerobic bacteria in sewage-treatment processes produces marsh gas(methane).
Nitrifying bacteria
convert free nitrogen to nitrogen compounds
convert proteins into ammonia
reduce nitrates to free nitrogen
reduce nitrates to free nitrogen
D.
reduce nitrates to free nitrogen
The outermost cell layer of the endosperm (3n) of seed is called aleurone layer. Since the cells of aleurone layer are triploid, the number of chromosomes would be = 63, as root tip cells (2n) has 42 chromosomes.
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