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प्रश्न
In which plant will you look for mycorrhiza and corolloid roots? Also explain what these terms mean.
उत्तर
Mycorrhiza is a symbiotic association between a fungus and the roots of a vascular plant. Mycorrhiza is found in some gymnosperm genera, such as Pinus.
Coralloid Roots: These roots, too, have a symbiotic relationship, but this time with nitrogen-fixing cyanobacteria. Many nodules are formed in the roots giving them a coralloid appearance. Examples are Cycas and plants of Leguminosae.
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संबंधित प्रश्न
Write a note on the economic importance of gymnosperms.
Describe the important characteristics of gymnosperms.
Endosperm in gymnosperm is formed ______.
What do you infer from the term pycnoxylic?
Mention two characters shared by gymnosperms and angiosperms.
Read the following five statements (i to v) and select the option with all correct statements:
- Mosses and lichens are the first organisms to colonise a bare rock.
- Selaginella is a homosporous pteridophyte.
- Coralloid roots in Cycas have V AM.
- Main plant body in bryophytes is gametophytic, whereas in pteridophytes it is sporophytic.
- In gymnosperms, male and female gametophytes are present within sporangia located on sporophyte.
In gymnosperms, megaspore mother cell divides meiotically to form four megaspores. Out of four megaspores, one develops into a multicellular structure termed as : ·
Gymnosperms are called naked seeded plants due to the absence of
Each plant or group of plants has some phylogenetic significance in relation to evolution: Cycas, one of the few living members of gymnosperms is called as the ‘relic of past’. Can you establish a phylogenetic relationship of Cycas with any other group of plants that justifies the above statement?
Lichen is usually cited as an example of ‘symbiosis’ in plants where an algal and a fungal species live together for their mutual benefit. Which of the following will happen if algal and fungal partners are separated from each other?
- Both will survive and grow normally and independent from each other.
- Both will die
- Algal component will survive while the fungal component will die.
- Fungal component will survive while algal partner will die.
Based on your answer how do you justify this association as symbiosis.
