Tag: zoology

Questions Related to zoology

They help in increasing soil fertility.

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

  1. Pseudomonas and cereals

  2. Bacillus and Penicillium

  3. Salvinia and Marsilea

  4. Nostoc and legumes

Show answer
Correct Option: D
Explanation:

Nostoc and legumes help in increasing soil fertility by nitrogen fixation in the soil.

Correct answer-D

Biofertilizers include

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

  1. Nitrogen fixing bacteria

  2. Mycorrhiza

  3. Nitrogen fixing cyanobacteria

  4. All of the above

Show answer
Correct Option: D

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

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

  1. Photosynthesis

  2. Surrounded by mucilage

  3. Growing every where

  4. Capable of fixing nitrogen

Show answer
Correct Option: D
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'

Which one of the following is useful in rice fields?

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

  1. Rhizobium

  2. Clostridium

  3. Anabaena

  4. Ferrobacterium

Show answer
Correct Option: C

Which is used as biofertilizer?

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

  1. Azolla

  2. Marchantia

  3. Funaria

  4. Dryopteris

Show answer
Correct Option: A

Biofertilizer is?

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

  1. Manure

  2. Enriched manure

  3. Nutrient rich organisms

  4. Composited manure

Show answer
Correct Option: C
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.

Cyanobacteria are / Nostoc is

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

  1. Oxygenic with nitrogenase

  2. Oxygenic without nitrogenase

  3. Non- Oxygenic with nitrogenase

  4. Non - Oxygenic without nitrogenase

Show answer
Correct Option: A
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'.

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

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

  1. Phycoerythrin

  2. Cyanophycin

  3. Phycocyanin

  4. None of these

Show answer
Correct Option: C
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).

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

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

  1. RuBISCO

  2. PEP carboxylase

  3. Nitrogenase

  4. Zymase

Show answer
Correct Option: C
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'.

Nostoc is known to do

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

  1. Photosynthesis

  2. Photosynthesis and $N _2$ fixation simultaneously

  3. $N _2$ fixation only

  4. Either photosynthesis or $N _2$ fixation at a time

Show answer
Correct Option: B
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.'