BIO1011 Week 11.docx - BIO1011 Week 11 Lecture 21 Haploid gametophyte to diploid sporophyte Unicellular in their initial stage and grows when the

BIO1011 Week 11.docx - BIO1011 Week 11 Lecture 21 Haploid...

This preview shows page 1 - 3 out of 6 pages.

BIO1011 Week 11 Lecture 21 Haploid gametophyte to diploid sporophyte. - Unicellular in their initial stage and grows when the conditions were right and became multicellular where it could be either female or male moss. - Fertilisation then occur when they’re immersed in aquatic environment and become diploid. - Capsule release spores through meiosis. Multicellular sporophytes provide, on average greater spore production and thus more widespread dispersal from each successful formation of a zygote. Vascular plant evolution: Hornworts: The ‘launching pad “of vascular plants - Hornworts have a long lived, photosynthetic sporophyte and gametophytes are still dominant. - Intercalary growth (happens on the base of horn warts) Three key evolutionary innovations during land plant evolution: Stomata : plants need gas exchange and happens in the leaves to prevent from drying out, stomata have evolved. For stomata to open, there is an enormous loss of water. In low water environment, stomata open and cause the plant to be turgid. Sporophytes : more persistent as can be seen in hornworts. Vascular tissue: more availability of light in terrestrial environment. Therefore, plants needs to grow taller to strengthen the plants to grow and bring water up from the soil to the leaves. - Phloem transports photosynthetic carbohydrates (sugar) - Xylem transports water and minerals and compromise of tracheids in which helps to strengthen the plant and transport minerals. First vascular plants: Rhyniophytes (base of the lycophytes) has some unique branches which allows them to photosynthesise and create more sporangia. - No true roots. Therefore, no vascular tissues. - Has rhizoids but has no leaves. - Consists of branching which allowed them to capture light than any other plants - Also consists of terminal sporangia which allowed them to produce more spores. Early evolution on vascular plants: Tracheophytes Evolution of leaves:
Image of page 1

Subscribe to view the full document.

- Mosses does not have true leaves because they don’t have any vascular tissue to move water around planyts. They can still move water around but not in the way where vascular
Image of page 2
Image of page 3
  • '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes