What is the female gametophyte in pine?
What is the female gametophyte in pine?
Deep inside the female cone, ovules develop into the mature female gametophyte that bears fertile egg cells. When the egg cells are ready, the pollen grain enters the micropyle, an opening in the female cone near the ovule.
Are pine cones gametophytes or sporophytes?
sporophyte plant
Cones form on a mature sporophyte plant. Inside male cones, male spores develop into male gametophytes. Each male gametophyte consists of several cells enclosed within a grain of pollen. Inside female cones, female spores develop into female gametophytes.
Is a pine tree a gametophyte?
Examples include conifers such as pine and spruce trees. The gymnosperm life cycle has a dominant sporophyte generation. Both gametophytes and the next generation’s new sporophytes develop on the sporophyte parent plant. Figure below is a diagram of a gymnosperm life cycle.
What specific cells of pine undergo meiosis?
(1) The adult pine, a sporophyte, produces young male cones near tips of branches. (2) Spore mother cells (2n) in the developing sporangia undergo meiosis, and each mother cell produces four microspores (1n).
How many cells are in pine pollen?
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.
What do female pine cones produce?
The female pine cone, or megastrobilus, produces the ovule, or unfertilized seed. Scales (modified leaves) on the female cone open to receive pollen, then close. Fertilization takes place late the following spring.
Is a pine tree a sporophyte?
Pine tree is a gymnosperm. Sporophyte is the dominant phase in the life cycle of gymnosperms.
How do pine cones reproduce?
Male pine cones produce pollen, which is like a powder. The male cones release their pollen, which is carried around the air by blowing wind, and hopefully to another female pine cone on a different pine tree. If the pollen reaches a female pine cone, this process is called pollination.
Where does meiosis occur in a pine tree?
Pine trees also have larger, woody, female cones. In ovules on each scale of these cones, meiosis occurs and produces a single large haploid spore – the megaspore. The megaspore divides by mitosis, producing the multicellular haploid female gametophyte.
Is a pine tree haploid or diploid?
Gymnosperms are unique plants because they produce naked seeds. This alternation of generations in gymnosperms, such as pine trees, means that there are multicellular stages that are haploid and diploid.
What is the function of pine resins?
Pine needle resin serves as defense against insects and other animals, which confront the distasteful substance when boring into the conifer’s leaves. The resins may disrupt the feeding, digestion or metabolic function of the attacker.
Does pine pollen contain DHT?
The testosterone in pine pollen is free testosterone. Don’t mistake free testosterone with dihydrotestosterone (DHT). Free testosterone is utilized in both men and women; while DHT is responsible for unwanted hair growth in women (facial and body hair).
