Do lizards reproduce sexually or asexually?
Most reptiles reproduce sexually, although some are capable of asexual reproduction. Asexual reproduction has been identified in six families of lizards and one snake family. The sex of reptile offspring can be determined by the environment.
How do plants reproduce a sexually?
Flowering plants reproduce sexually through a process called pollination. The flowers contain male sex organs called stamens and female sex organs called pistils. Cross-pollination happens when the wind or animals move pollen from one plant to fertilize the ovules on a different plant.
Are Archegonia asexual?
Asexual reproduction is when an organism makes a copy of itself without exchanging genes, while sexual reproduction is the creation of an offspring by the mixing of male and female gametes. The female sex organ in non-flowering plants is the archegonium, with archegonia being the plural form.
What is the life cycle of mosses?
The life cycle of a moss, like all plants, is characterized by an alternation of generations. A diploid generation, called the sporophyte, follows a haploid generation, called the gametophyte, which is in turn followed by the next sporophyte generation.
How can Moss reproduce asexually?
Mosses reproduce by spores, which are analogous to the flowering plant’s seed; however, moss spores are single celled and more primitive than the seed. Mosses also spread asexually by sending out new shoots in the spring from last years plants as well as fragmentation.
Do mosses have flagellated sperm?
Primitive bryophytes like mosses and liverworts are so small that they can rely on diffusion to move water in and out of the plant. Their flagellated sperm must swim through water to reach the egg. So mosses and liverworts are restricted to moist habitats.
What plants have motile sperm?
In the life cycle of plants, sperm cells are the only flagellated cells. Motile sperms are seen in bryophytes (their gametophytes), several protists, ferns and some of the gymnosperms (ginkgo and cycads).
Which plants have flagellated sperm?
The only extant seed plants that have flagellated sperm are Ginkgo and Cycadales (Table 1, Figs.
Do mosses have roots?
Mosses, on the other hand, don’t have roots, stems, a vascular system nor flowers. Instead, they have an organ called a “rhizoid,” which looks like a root, anchors the plant to surfaces such as a rock or bark. These rhizoids transport only a very small amount of water and nutrients to the plant.
Why is a Rhizoid not a true root?
What are rhizoids? Rhizoids appear to be ‘root-like’ as they do fulfil the role of gripping the plant to the ground, stone, branch etc. But, as they do not fulfil the water and nutrient absorption role of roots (nor the food storage) they are not true roots.
What are true roots?
A true root system consists of a primary root and secondary roots (or lateral roots). the diffuse root system: the primary root is not dominant; the whole root system is fibrous and branches in all directions. Most common in monocots. The main function of the fibrous root is to anchor the plant.
Does true roots reverse GREY hair?
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