Question:

Difference between male and a female pine cone?

by  |  earlier

0 LIKES UnLike

i have no clue..

please help. thanks

for the help.

 Tags:

   Report

6 ANSWERS


  1. size, for one thing

    From http://science.jrank.org/pages/5235/Pine...

    "The male strobili [cones] are typically about 0.4-0.8 in (1-2 cm) in diameter and form on the lower part of the tree. The female strobili are much larger and form on the upper part of the tree. The male strobilus is composed of many modified leaves, called microsporophylls, which are spirally arranged about a central axis. Each microsporophyll has two microsporangia attached. Microsporangia are organs that contain microsporocytes, immature pollen grains. The microsporocytes develop into pollen grains with four cells each. The four cells of the pollen grain are haploid, in that each contains one set of chromosomes. Thus, the pollen grain of pines is a multicellular haploid tissue, and is the male gametophyte. In the spring time, the male strobilus releases pollen into the wind, and then shrivels up and dies.

    The female strobilus is larger than the male strobilus. It is composed of many scales (modified leaves) which are spirally arranged about a central axis. Each scale has a sterile bract and two ovules, egg-forming structures, attached to it. The ovule consists of two types of tissues, the nucellus and its surrounding integument. A special pore, called a micropyle, passes through the integument to the nucellus.

    In pollination, a pollen grain lands on the female strobilus and sticks to a special fluid in the micropyle. As this fluid evaporates, the pollen grain is drawn into contact with the nucellus. This causes the pollen grain to germinate and form a pollen tube. Then, the female tissue produces four megaspores. The megaspores are haploid cells, in that each has one set of chromosomes. One of the megaspores develops into a megagametophyte, a multicellular haploid tissue, and the others degenerate. Then, more than one year after the pollen grain has landed on the female strobilus, the female megagametophyte forms archegonia, reproductive structures which contain egg cells."


  2. The Male cone will form at the bottom of the tree and is much

    smaller than the female  and the male produces the pollen

    and the female, produces the ovual and forms at the top of the tree.

  3. The male will PINE for the female...

  4. lol weird question

    but i think it's like the difference of a male and female tree or any other plant.

  5. Male cones produce pollen and female cones produce ova.

  6. Goto this link and click on Gymnosperms at the bottom of the page for photos of "male" and "female" pine cones.

    http://oak.cats.ohiou.edu/~braselto/read...

Question Stats

Latest activity: earlier.
This question has 6 answers.

BECOME A GUIDE

Share your knowledge and help people by answering questions.
Unanswered Questions