Tag: lichens ( the nature's pioneers )

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Multiple choice biology adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in

  1. Polar regions

  2. Deserts

  3. Oceans

  4. Tropical rainforests
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Here, the given characteristics depict the features of the tiger. It is one of the topmost predators in the tropical rainforests because its unique adaptation is suitable to live in that environment. One among them is their dark fur coat, blue eyes and black stripes. Here, the black stripes are more than 100 in number and used for identification of tiger. It attacks other animals by surprise so it also knows as ambush predator and tigers are the very fastest animal.

So, the correct answer is option D.

Multiple choice biology adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which option best describes a tropical region?

  1. Hot and humid

  2. Moderate temperature, heavy rainfall

  3. Cold and humid

  4. Hot and dry
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Moist tropical climates are known for their high temperatures and a large amount of rain around the year. Due to the high temperature, tropical regions are hot and due to a large amount of rainfall, tropical regions are humid.
So, the answer is A.
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which of the following scientist coined term lichen? 

  1. Aristotle

  2. Theophrastus

  3. Socrates

  4. Leeuwenhoek
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lichen is a symbiotic association of fungi ( Ascomycota or basidiomycete) with an alga (Chlorophyceae or Cyanophyceae). The term Lichen was coined by Theophrastus (370-285 BC).

So, the correct  option is 'Theophrastus'.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Thallus is foliose in 

  1. Lichens

  2. Algae

  3. Mosses

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

Lichens are a symbiotic partnership of fungus and algae. The dominant partner is the fungus, which gives the lichen the majority of its characteristics from its thallus shape to its fruiting bodies. So, thallus is foliose in lichens. Lichens occur in one of four basic growth forms. crustose, squamulose, foliose and fruticose. So, the correct answer is 'Lichens'.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which of the following physiological process happens in lichens when the phycobiont is a cyanobacteria?

  1. Nitrogen fixation

  2. Carbon fixation

  3. Carbon assimilation

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The fungal part of the lichens is known as mycobiont. Cyanobacteria have a special structure known as heterocyst which is specialised to perform nitrogen fixation. It has specific enzymes like nitrogenase which actively fixes the atmospheric nitrogen to a usable form. They are autotrophic so they also fix carbon during the dark reaction of photosynthesis into organic compounds. This conversion process of inorganic carbon (carbon dioxide) to organic compounds is also known as carbon assimilation.

So, the correct answer is 'Nitrogen fixation, Carbon fixation and Carbon assimilation'.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

The nutrients received by heterotrophic part of the lichen from the autotrophic part are

  1. Lipids

  2. Proteins

  3. Carbohydrates

  4. Minerals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The algal component carries out photosynthesis and produces carbohydrate glucose during the dark reaction of photosynthesis.
  • Minerals are provided to the algal part by fungal mycelium. It absorbs water and minerals from the substratum.
  • Lipids and proteins are neither supplied by algal part nor fungal part but synthesized within the organism itself.
  • So the correct answer is 'Carbohydrate'.
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Lichens are not found in _________?

  1. Water

  2. Tree trunks

  3. Decaying logs

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

Lichens are found in odd places which includes areas in the Arctic and Antarctic, and mountain tops. Lichens are found on soil, rock or tree bark. Some will also grow on old wood (dead branches, fence rails, etc.), masonry and cemetery headstones. Lichens are often found in extreme environments where other organisms are sparse.


So the correct option is 'Water'.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which of the following share same mode of nutrition?

  1. Rhizobium and lichens

  2. Lichens and Mycorrhizae

  3. Mycorrhizae and Rhizobium

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Rhizobium is a genus of bacteria associated with the formation of root nodules on plants. These bacteria live in symbiosis with legumes. They take in nitrogen from the atmosphere and pass it on to the plant, allowing it to grow in soil low in nitrogen.
  • A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi in a symbiotic relationship. 
  • Mycorrhizal fungi colonize the plant's root system and develop a symbiotic association called “mycorrhiza” They form a network of fine filaments that associate with plant roots and draw nutrients and water from the soil that the root system would not be able to access otherwise.
  • Lichens, Rhizobium and Mycorrhizae  have symbiotic relationships and follow same mode of nutrition.
  • So the correct answer is " All the above".