Tag: living world

Questions Related to living world

In what way does a fungus growing around the roots of higher plants benefit them?

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. It products antimicrobial substances

  2. It produces growth promoting substances

  3. It helps in absorbing water nitrogen and other minerals

  4. All of them

Show answer
Correct Option: D
Explanation:
The associations between roots and fungi are called mycorrhizae. The roots provide essential nutrients for the growth of the fungi. In return, the large mass of fungal hyphae acts as a virtual root system for the plants, increasing the amount of water and nutrients that the plant may obtain from the surrounding soil. So, the correct option is "D" (All of them)

Mycorrhiza acts as

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Mechanical tissue

  2. Root hair in adverse conditions

  3. Modified root

  4. Organ for vegetative propagation

Show answer
Correct Option: B

The symbiotic association between fungi and roots of higher plants is referred to as:

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. lichen

  2. mycorrhiza

  3. biofertiliser

  4. biocontrol agent

Show answer
Correct Option: B
Explanation:
  • The symbiotic association between fungi and roots of higher plants is referred to as mycorrhiza.
  • The plant supports the fungus by providing carbohydrates needed for fungal growth, while the fungus helps the plant by increasing its root surface area.
  • So, the correct answer is 'Mycorrhiza'.

Select correct statement w.r.t. mycorrhiza 

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Ectomycorrhiza forms hartig net in the intracellular spaces of cortex cells

  2. Endotrophic mycorrhiza are mostly basidiaamycetes members

  3. VAM is a special type of endomycorrhiza and absorbs phosphate

  4. Mycorrhizal or fungal roots have root cap and root hairs

Show answer
Correct Option: C
Explanation:

  • The ectomycorrhiza's hyphae does not penetrate the cortex cells and they only colonize in the intercellular spaces between them, and this network of hyphae are called as hartig net. So, the first statement is correct.
  • The endotrophic mycorrhiza are a type of arbascular mycorrhiza.
  • Vesicular arbascular mycorrhiza help the plants to grow well by colonizing their roots and helping them to efficiently absorb the phosphate in the soil.
  • So the correct option is 'VAM is a special type of endomycorrhiza and absorbs phosphate'.

Which one of the following is a useful functional association between fungi and the roots of higher plants?

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Lichen

  2. Coralloid root

  3. Biofertilizer

  4. Mycorrhiza

Show answer
Correct Option: D
Explanation:

Mycorrhiza is a useful functional association between fungi and the roots of higher plants in which fungi absorb nutrients from the soil as their roots are not such strong and the tree provides food to the fungi. The best example is Orchid mycorrhiza

So the correct option is 'Mycorrhiza'

Glomus sp., which involve in mycorrhizal association belongs to

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Ectotrophic mycorrhiza

  2. Endotrophic mycorrhiza

  3. Parasitic fungus

  4. Cyanobacteria

Show answer
Correct Option: B
Explanation:
Fungi present inside the roots are called endotrophic mycorrhiza. eg:Glomus.
so, the correct option is 'Endotrophic mycorrhiza'.

VAM (Vesicular-arbuscular mycorrhizae) represents

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Saprophytic bacteria

  2. Symbiotic fungi

  3. Saprophytic fungi

  4. Parasitic algae

Show answer
Correct Option: B
Explanation:

Mycorrhiza biofertilizer is also known as VAM, adheres to plants rhizoids leading to development of hyphae. Hyphae boost development and spreading of white root in to soil leading to significant increase in rhizosphere. These hyphae further penetrate and form arbuscules within the root cortical. VAM fungi form a special symbiotic relationship with roots of plant that can enhance growth and survivability of colonized plants. Mycorrhiza biofertilizer is very useful in organic farming as well as normal commercial farming. So, VAM is a symbiotic fungi and not a parasitic algae, saprophytic bacteria and saprophytic fungi. Thus, the correct answer is option B.

Mycorrhizae are the example of 

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Amensalism

  2. Antibiosis

  3. Mutualism

  4. Fungistasis

Show answer
Correct Option: A

Which of the following pairs is mismatched?

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Azospirillum - Maize

  2. Mycorrhiza - Pine

  3. VAM - Mycoherbicide

  4. Rotenone - Natural insecticide

Show answer
Correct Option: C
Explanation:

Azospirillum inoculations are recommended mainly for sorghum, millets, maize, sugarcane and wheat.
Mycorrhizal biofertilizers can be used for pine trees.
Rotenone is an odourless, colourless, crystalline ketonic chemical compound used as a broad-spectrum insecticide, piscicide, and pesticide. It occurs naturally in the seeds and stems of several plants, such as the jicama vine plant and the roots of several members of Fabaceae.
VAM is a biofertilizer and not a mycoherbicide. 

So, the correct answer is option C.

The association between fungus and root system of certain plants is called as

botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

  1. Amensalism

  2. Competition

  3. Mycorrhiza

  4. Cauliflory

Show answer
Correct Option: C
Explanation:
  • Mycorrhiza is a symbiotic association between a fungus and a plant.
  •  The term mycorrhiza refers to the role of the fungus in the plant's rhizosphere, its root system.
  •  Mycorrhizae play a role in plant nutrition, soil biology and soil chemistry.
  • Hence, Mycorrhiza is the association between fungus and root system of some plants
  • So, the correct answer is 'Mycorrhiza'.