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प्रश्न
Write a note on the economic importance of gymnosperms.
उत्तर १
economic importance of gymnosperms:
- For decoration: plants like Soycus, Pinus, Araucaria, Gingko, Thuja, Cryptomeria, etc. are used.
- For food items: sago is obtained from Cycas and Jamia. Pine nuts seeds are eaten. The seeds of Neetam, Gingo, and Cycas are used as food.
- Wood for furniture: wood obtained from pine, cedar, and fir is used as furniture and timber.
- Medicines: Poultice is made by grinding the seeds, bark, and megasporophyll of Cycas. Taxal medicine is obtained from Texas bevafolia. Which is used in cancer Thuja leaves are boiled and used to cure fever, cough, and arthritis.
- Abies balsamea: Canada balsam is obtained from, cedar wood oil from Juniperus and turpentine oil from Pinus.
उत्तर २
Economic importance of gymnosperms
- Construction purposes: Many conifers such as pine, cedar, etc., are sources of the soft wood used in construction and packing.
- Medicinal uses: An anticancer drug Taxol is obtained from Taxus. Many species of Ephedra produce ephedrine, which can be used in the treatment of asthma and bronchitis.
- Food source: The seeds of Pinus gerardiana (known as chilgoza) are edible.
- Source of resins: Resins are used commercially for manufacturing sealing waxes and water-proof paints. A type of resin known as turpentine is obtained from various species of Pinus.
संबंधित प्रश्न
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
Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is ______.
The giant Redwood tree (Sequoia sempervirens) is a/an ______.
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 corolloid roots? Also explain what these terms mean.
