Tag: zoology

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Questions Related to zoology

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Some blue green algae can be used as biofertilizer as they are

  1. Photosynthesis

  2. Surrounded by mucilage

  3. Growing every where

  4. Capable of fixing nitrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Some cyanobacteria can fix atmospheric nitrogen in anaerobic conditions by means of specialized cells called heterocysts. These heterocyst forming species are specialized for nitrogen fixation, and are able to fix nitrogen gas into ammonia, nitrites, or nitrates, which can be absorbed by plants and converted to proteins and nucleic acids as nitrogen cannot be directly absorbed by plants. Therefore, some of the cyanobacterial species are used as biofertilizers. 

So, the correct answer is 'Capable of fixing nitrogen'

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Biofertilizer is?

  1. Manure

  2. Enriched manure

  3. Nutrient rich organisms

  4. Composited manure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A biofertilizer is a substance which contains nutrient rich living microorganisms which colonize the rhizosphere or the interior of the plant and promotes the growth of the plant or the seed by increasing the availability of primary nutrients to the plant.

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Cyanobacteria are / Nostoc is

  1. Oxygenic with nitrogenase

  2. Oxygenic without nitrogenase

  3. Non- Oxygenic with nitrogenase

  4. Non - Oxygenic without nitrogenase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cyanobacteria fix atmospheric nitrogen through the help of enzyme nitrogenase and are oxygenic photosynthetic also.

So, the correct option is 'Oxygenic with nitrogenase'.

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Cyanobacteria are commonly called blue-green algae. This is because they possess in addition to chlorophylls a blue pigment called

  1. Phycoerythrin

  2. Cyanophycin

  3. Phycocyanin

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Phycocyanin Antioxidant. Phycocyanin is the main component in Linablue Spirulina Extract. It is a blue pigment that is important in the photosynthesis (food production) of cyanobacteria. It assists the function of chlorophyll, especially during low light conditions. So, the correct option is "C" (Phycocyanin).

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Heterocysts are considered as a site of nitrogen fixation in nitrogen-fixing BGA as they possess

  1. RuBISCO

  2. PEP carboxylase

  3. Nitrogenase

  4. Zymase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Heterocysts are specialized nitrogen fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctitorme, Cylindrospermum stagnale and Anabaena sphaerica. They fix nitrogen from dinitrogen in the air using the enzyme nitrogenase, in order to provide the cells in the filament with nitrogen for biosynthesis.
So, the correct answer in 'Nitrogenase'.
Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Nostoc is known to do

  1. Photosynthesis
  2. Photosynthesis and $N _2$ fixation simultaneously
  3. $N _2$ fixation only
  4. Either photosynthesis or $N _2$ fixation at a time
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nostoc is a genus of blue green algae. It is photosynthetic cyanobacteria. It contains chlorophyll pigment and carries out photosynthesis. It also has ability to fix atmospheric nitrogen and make it available to the plants. It is a non-symbiotic nitrogen fixer.

Thus, the correct answer is 'Photosynthesis and N$ _2$ fixation simultaneously.'