Short Answer TypeA hill station city had abundance of different species of lichens a few years back. Since it has turned a busy tourist spot very few lichens are found there.
(a)What could be the possible reason for this?
(b) What measures are to be taken to conserve lichens?
Long Answer TypeBriefly, explain the pattern of lifecycle followed by
a. All bryophytes
b. All pteridophytes
With the help of a schematic diagram describe the haplo-diptontic life cycle pattern in plants
One Word AnswersThe plant body in higher plants is well differentiated and well developed. Roots are the organs used for the purpose of absorption. What is the equivalent of roots in the less developed lower plants?
Short Answer TypeHeterospory i.e., formation of two types of spores – microspores and megaspores is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in plant kingdom?
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?
In which plant will you look for mycorrhiza and coralloid roots? Also, explain what these terms mean.
Long Answer TypeLichen 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?
a. Both will survive and grow normally and independent from each other.
b. Both will die
c. Algal component will survive while the fungal component will die.
d. Fungal component will survive while algal partner will die.
Symbiosis is the term used for the relationship in which two organisms get benefit from each other.
Lichen is a symbiotic relationship between algae and fungus.But the symbiotic relationship is an obligate one. This means that the organisms require the symbiotic relationship in order to survive.
The algae and fungus are mutually dependent on each other. The fungus is the only source of water and nutrients for the algae.
Algae is the only source of food to the fungus. There are no alternative means for meeting the basic needs. Thus, If the two are sperated both will die because they will not be able to fulfil the requirements in the absence of the other.
Thus option b is true. Both will die.
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