Table of Contents
- 1 How do you think the pollen is transported from the male cones to the female cones for fertilization and seed formation to occur?
- 2 What is produced by the female cone?
- 3 What do pollen cones do?
- 4 What is male cone and female cone?
- 5 What distributes pollen grains from male comes to female cones among pines?
- 6 Why do female cones look different from male cones?
How do you think the pollen is transported from the male cones to the female cones for fertilization and seed formation to occur?
The microspores develop inside the microsporangium. Further mitosis of the microspore produces two nuclei: the generative nucleus and the tube nucleus. Upon maturity, the male gametophyte (pollen) is released from the male cones and is carried by the wind to land on female cones.
What is produced by the female cone?
ovules
The female cone (megastrobilus, seed cone, or ovulate cone) contains ovules which, when fertilized by pollen, become seeds.
What is female cone?
Cones are modified stems that have been retasked for reproduction. The female cone, which is larger than the male cone, consists of a central axis and a cluster of scales, or modified leaves, called strobili. The male cone produces tiny amounts of pollen grains that become the male gametophyte.
How is a pollen cone different from a seed cone?
Pollen cones are characteristically smaller and wider than seed cones. Pollen cones tend to whither and die once the pollen within the cones has been released to fertilize the seed cones. Seed cones tend to develop higher up in the tree to aid in dispersal once the seeds are pollinated.
What do pollen cones do?
Pollen (from the pollen cones / male cones) has to reach the ovules (in the seed cones / female cones) in order to fertilize them, creating seeds. Pollen cones, which are usually much smaller and less conspicuous, tend to whither up after releasing their pollen. Pollen from conifers is typically a fine yellow dust.
What is male cone and female cone?
Why are male cones below female cones?
They have a seed in their open scales that becomes a new tree when it gets pollen from a male cone. Male cones are a lot smaller than female cones and their scales aren’t as open. Each scale in a male cone contains the pollen that can spread to a female cone to make a seed.
Why do female cones look different from the male cones?
Different cones have different roles. They have a seed in their open scales that becomes a new tree when it gets pollen from a male cone. Male cones are a lot smaller than female cones and their scales aren’t as open. Each scale in a male cone contains the pollen that can spread to a female cone to make a seed.
What distributes pollen grains from male comes to female cones among pines?
wind
In the male cones (staminate cones), the microsporocytes give rise to pollen grains by meiosis. In the spring, large amounts of yellow pollen are released and carried by the wind. Some gametophytes will land on a female cone. Pollination is defined as the initiation of pollen tube growth.
Why do female cones look different from male cones?
What is the pollen cone?
There are two types of cones on most Pacific NW conifers: seed cones and pollen cones. These are female and male reproductive organs, respectively. Pollen cones, which are usually much smaller and less conspicuous, tend to whither up after releasing their pollen. Pollen from conifers is typically a fine yellow dust.