Discursive exercises on Kingdom Plantae

Biology

Shall we fix the contents of Kingdom Plantae?

Per Denisele FloresPosted in 24/01/2020 - 14:30

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To the plants they are eukaryotic, pluricellular and photosynthetic autotrophic individuals.

O kingdom plantae it has the most complex life cycles of all living organisms.

Despite being sessile organisms, that is, without mobility, plants have many coping strategies. seed dispersal and cross-pollination, thus ensuring its territorial expansion and variability genetics.

Test your knowledge by solving 10 discursive exercises about the Plantae Kingdom.

Discursive exercises – Kingdom Plantae

1. What is the dominant phase in the bryophyte cycle?
2. Name a characteristic of pteridophytes that allowed this group to reach a larger size than mosses.
3. Compare the fern cycle with the moss cycle. In each case, indicate the dominant phase, as well as the sporophyte and gametophyte.
4. Name three characteristics of angiosperms.
5. What is a haplodiplobiontic cycle? What is the difference between sporophyte and gametophyte?
6. On what basis can we say that bryophytes have not completely freed themselves from water?
7. Describe double fertilization in angiosperms.
8. What is the origin of the seed? What is the origin of the fruit?
9. What are the advantages of the fruit for the plant?
10. How many and what are the whorls of a flower?

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1. The dominant phase is the gametophyte which is larger and free-living.
2. Vascularization allowed these individuals to reach larger sizes.
3. The reproductive cycle of ferns is of the haplodiplobiontic type, the spores are produced by meiosis inside the ferns. sporangia and carried by the wind to the moist substrate, where it attaches and forms the gametophyte, which is independent and called prothallus. The prothallus is very small and ends up in contact with the water, allowing fertilization through the flagellated antherozoids that swim to the oosphere, giving rise to the sporophyte which is the dominant phase of the cycle. In bryophytes, individuals have separate sexes and the antherozoid reaches the oosphere also through water and then fertilization occurs forming a diploid sporophyte that has a stem with a capsule at the tip and is the transient phase of the cycle. Haploid spores are produced in this capsule, then released and carried by the wind, germinating away from the mother plant. Germination leads to the formation of a new gametophyte which is the enduring part of the cycle.
4. Plants with flowers, fruits and double fertilization.
5. It is the cycle in which the alternation of generations occurs. The sporophyte is the diploid stage of the plant, where it produces spores by meiosis. The gametophyte is a haploid individual that produces gametes.
6. Bryophytes are dependent on water for fertilization.
7. Double fertilization is an important characteristic of angiosperms. After the pollen is deposited on the receptive stigma, it germinates and produces the pollen tube that will grow towards the ovary. Still inside the pollen tube, the generative cell divides giving rise to two sperm nuclei (male gametes) that are released and one fertilizes the oosphere (female gamete) generating a diploid zygote and the other unites with two polar nuclei and originates a triploid tissue called endosperm.
8. Seeds are the development of mature and fertilized ovules of gymnosperms and angiosperms. The fruits are the development of the ovaries after the fertilization of the angiosperms.
9. In addition to protecting the seed, the fruits attract dispersers that, when they feed on them, carry the seeds away, promoting the conquest of new environments.
10. Flowers have four whorls: the calyx (sepals), the corolla (petals), the androecium (stamens), and the gynoecium (carpels).

Check also:

• Objective exercises – Kingdom Plantae
• List of Exercises – Kingdom Animalia
• List of exercises – Kingdom Fungi
• Exercises on Kingdom Monera

plant life cyclesdouble fertilizationkingdom plantae

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