--%>
Assignment Help - homework help

Trends of gametophyte in evolution of plants

Write down the trends of gametophyte in evolution of the plants?

E

Expert

Verified

A propensity of gametophyte evolution in the plants has been towards formation of gametes which are independent from water. In bryophytes and in pteridophytes the fecundation is totally dependent on water. In phanerogamic plants such dependency doesn’t exist.

Another propensity is reduction in the size and period of gametophyte.

In bryophytes the gametophyte is indeed lasting stage. In pteridophytes, gymnosperms and angiosperms it became temporary stage and its relative size was successively decreased.

A third evolutionary trend relates to interdependency between gametophytes and sporophytes. In bryophytes the sporophyte is entirely dependent on the gametophyte to survive. In the remaining plants sporophyte is the independent stage and once autotrophic gametophyte in bryophytes and pteridophytes became dependent upon the sporophyte in phanerogamic plants.

   Related Questions in Biology

  • Q : Simple and facilitated diffusion What

    What is the basic difference among simple and facilitated diffusion? Facilitated by which kind of molecule does the word facilitated signify?

    		•
  • Q : Illustrate functions of internal ear

    Explain elements that represent the internal ear? Illustrate functions of those structures?

    		•
  • Q : Defense method when inflammation fails

    Explain the defense method which begins to work while inflammation fails to stop an infection?

    		•
  • Q : Are nematodes triploblastic or

    Are nematodes triploblastic or diploblastic animals?

    		•
  • Q : What is Voice Communications Voice

    Voice Communications: It is the communication via the Internet is the most advanced and newest technology nowadays. This technology was introduced in the mid of 90s that has raised the value and significance of Internet communication.

    		•
  • Q : Names by which erythrocytes are

    What are the other names by which erythrocytes are recognized? And also write down the main function of these cells?

    		•
  • Q : Motivation - Individual Behavior -

    This factor refers to all the forces operating within a person to cause him or her to engage in certain kinds of behavior rather than others. Even if all the factors are present to unless the person is motivated to perform well. Motivation may be internal, for example, a person's skill, ability,

    		•
  • Q : Different Views of Organizational

    Much of the literature of this learning, seems to be following in the tradition of learning theories and taking a psychological or individual perspective on the phenomenon. There is a debate about whether or not organizations can learn and many just take the approach

    		•
  • Q : Explain about the acrosome of a sperm

    Explain about the acrosome of a sperm cell? And mention that how is it formed?

    		•
  • Q : Polarity do water-soluble and

    Which type of polarity do water-soluble and fat-soluble substances correspondingly comprise?

    		•