Gymnosperms MCQ Quiz in বাংলা - Objective Question with Answer for Gymnosperms - বিনামূল্যে ডাউনলোড করুন [PDF]

Concept:

• Kingdom Plantae is divided into Algae, Bryophytes, Pteridophytes, Gymnosperms, and Angiosperms.
• Cryptogams consist of seedless plants whereas phanerogams consist of seed-bearing plants.
• Algae, bryophytes, and pteridophytes are cryptogams whereas gymnosperms and angiosperms are phanerogams.

Explanation:

Option 1:

• The Pteridophytes include horsetails, club mosses, and ferns.
• They are the first vascular plants that possess vascular tissues, that is, the xylem and phloem.
• Club mosses belong to the family Lycopodiaceae. Also known as ground pine.
• They require water for fertilization.

Option 2:

• Ferns are also classified as Pteridophytes. Ferns have large leaves known as macrophytes.
• The main plant body is sporophyte which is differentiated into roots, stems, and leaves.
• They require water for fertilization.

Option 3:

• Gymnosperms are plants in which seeds are not enclosed by an ovary wall or seed coat, that is, seeds formed post-fertilization are naked.
• In gymnosperms, the male and female gametophytes do not live separately as free-living organisms.
• They continue to exist inside the sporangia on the sporophytes.
• From the microsporangium, the pollen grain is released.
• Pollen grains are carried through the air and encounter the opening of the ovules carried by megasporophylls.
• In the ovules, the pollen tube containing the male gametes expands toward the archegonia and releases its contents close to the archegonia's mouth.
• A zygote becomes an embryo after fertilization, and ovules become seeds. This crop of seeds is uncovered.

Option 4:

• Angiosperms are flowering plants. They bear, flowers, fruits, and seeds enclosed by an ovary wall.
• Ovules form seeds and the ovary forms fruit. Pollination is a method of transfer of pollen grains/male gamete/sperm from the anther to the stigma of the flower.
• Pollination can occur by wind, water, air, birds, insects, bats, snails, etc.

So, the correct answer is Option 3: Gymnosperms.

Concept:

• Pteridophytes, Gymnosperms and Angiosperms are vascular plants.
• They are known as vascular plants as they possess xylem and phloem.
• Pteridophytes are the first vascular plants that possess vascular tissues.

Explanation:

• Xylem and phloem are complex tissues made up of different types of cells.
• In pteridophytes and gymnosperms, the xylem consists mainly of the tracheid, xylem fibers, and xylem parenchyma.
• Tracheid is the main water-conducting cell.
• Due to their absence of thick-walled vessels, which makes them softwood plants because vessels provide wood its strength, gymnosperms are also known as "softwood spermatophytes."
• Angiosperms on the other hand contain all four types of cells- tracheid, vessels, xylem fibers, and xylem parenchyma.
• Vessel elements are the main feature distinguishing the hardwood of angiosperms from the softwood of conifers.
• in Angiosperms, the tracheid, vessels, and fibers are all dead. The only living cell is the xylem parenchyma which stores food in it.

So, the correct answer is option 4.