Question

Q: Males cones are called staminate cones, where on the tree are they found? Each scale (microsporophyll) on the staminate cone bears a microsporangium that produces pollen grains (male gametophytes) Q: What do we call the pine's male gametophytes? Procedures 30.3 & 30.4 Phylum Coniferophyta → See figures named below in parenthesis from lab book Female ovulate cones are on upper branches of pine trees; each produces megaspores that undergo mitosis into a megagametophyte which, together with its surrounding tissues, is an ovule (Fig. 30.10, pine ovule cross section before fertilization). Ovule contains the pine's female gametophyte. Pollen grains are carried by the wind to ovulate cones. Once pollen grain germinates, it grows a tube & releases sperm that fuse with the egg cell in the megagametophyte to form a zygote. The zygote, in the ovule, develops into the embryo of the new sporophyte....the ovule is now a seed as it has a food supply & seed coat around the embryo (Fig.30.6) Q: What do we call the larger pine cones toward tops of the trees? Q: What is the function of the wings of a pine pollen grain? Q: What's another name for the 2n "baby" sporophyte? Mosses and other nonvascular plants PLANT GROUP Ferns and other seedless Seed plants (ymnosperms and angiosperma vascular plants Reduced, Independent Reduced (usually microscopic), dependent on Iphotosynthetic surrounding sporophyte tissue for nutrition and free living) Gametophyte Dominant Reduced, dependent Sporophyte on gametophyte for nutrition Dominant Dominant Gymnosperm Angiosperm

Answer 1

Ans: The male cones are found on the lower branches of the tree.

Ans: The pine's male gametophytes is called pollen grains.

Ans: The larger pine cones toward tops of the tree is called female ovulate cone.

Ans: The wings of a pine pollen grains helps in wind pollination. The yellow pollen grains are dispersed and remain suspended in the air with the help of wings, it is called sulphur showers.

Ans: The another name of 2n baby sporophyte is embryo.