Question

The symbiotic association is shown by
(a) Lichens
(b) Fungi
(c) Sandal
(d) Granite (Nepenthes)

Answer 1

Hint: The term symbiosis means living together of two or more organisms. The symbiotic association is a great example of mutualism type of interaction.

Complete step by step answer:
- Lichens: It is the symbiotic association between the algae and the fungus. In this type of association, both the organisms are benefited from each other. It represents the intimate mutualistic relationship. In this relationship between algae and fungus, an algae produces food by the process of photosynthesis and it is utilised by a fungus which in turn provides water and minerals to the algae and gives protection.
- Fungi: The fungus is involved in the association with the two organisms i.e. with mycorrhiza and lichens. The fungus puts out its mycelia and helps in the absorption of water and nutrients. The fungi help in the structure of lichen thallus and within which they provide a condition for a long term and stable association.
- Sandal: It is a class of wood from trees which comes in the genus Santalum. The woods of the sandal are heavy, yellow in colour, fine-grained and they keep their scents for more than a decade. It is often regarded as the most expensive wood in the world. The sandalwoods have many medicinal values as they are used in the treatment of both the mental and physical disorder like anxiety, fever, urinary tract disorder etc.
Granite (Nepenthes) is a type of carnivorous plant, due to its tropical nature, it is also known as the tropical pitcher plant which is commonly found in Australia and many other parts of the world.
Hence, the correct option is A.

Note: Lichens occur on a trunk of trees or empty ground or crispy patches. It is also used in the preparation of dye, perfumes etc. Lichens also help to convert the atmospheric carbon into the oxygen.