Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

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

Members of which algal class impart red colour to red sea?

  1. Cyanophyceae

  2. Rhodophyceae

  3. Phaeophyceae

  4. Bacillariophyceae
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The red sea is the saltiest sea and connects to the ocean without any river meeting the sea. It is named so because of the abundant occurrence of red coloured planktonic cyanophyceae called Trichodesmium erythraeum. This cyanophyceae imparts red colour to red sea. This results in the algal bloom or red bloom.

Thus, the correct answer is 'Cyanophyceae.'

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

I. Unicellular, colonial, filamentous, marine or terrestrial forms.
II. The colonies are surrounded by a gelatinous sheath.
III. Some can fix atmospheric nitrogen in specialized cells called heterocysts.
IV. They often form blooms in water bodies.
These above characters are seen in

  1. Archaebacteria

  2. Cyanobacteria

  3. Chrysophytes

  4. Dinoflagellates

  5. Slime Moulds
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cyanobacteria are also called as Blue green algae. They are unicellular, colonial, filamentous prokaryotes. They are found in marine and terrestrial habitats. The colonies are surrounded by a gelatinous sheath. They are photosynthetic bacteria. They often form blooms in water bodies and results in eutrophication. Some Cyanobacteria like Nostoc can fix atmospheric nitrogen in specialized cells called heterocysts and make it available to plants.

Thus, the correct answer is 'Cyanobacteria.'

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

Azolla possesses symbiotic association with

  1. <p>Anabaena</p>

  2. <p>Nostoc</p>

  3. <p>Azospirillum</p>

  4. <p>Rhizobium</p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Azolla is a small aquatic fern that maintains a symbiotic relationship with the cyanobacterium Anabaena azollae. This bacterium lives in the leaf cavities of the fern and fixes nitrogen for the plant.

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

Sesbania rostrate is preferred as green manure over other species because.

  1. It grows quickly

  2. It has extensive root system

  3. It possesses nodules on both stem and roots

  4. It possesses leaf nodules
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sesbania rostrate is mainly used as green manure to improve the fertility of the soil due to its fast growth, high biomass production and the ability to convert atmospheric nitrogen into a usable form for plants.