CLASSIFICATION OF PLANTS-
There are various differences between photosynthetic organisms like algae, mosses, grasses, and trees. So how do we organize and classify plants? Algae may be a term we use to explain an outsized group of photosynthetic organisms that aren't actually all associated with each other. Many organisms that are sometimes mentioned as algae, like cyanobacteria and diatoms, don’t resemble the items we expect of like plants. In fact, cyanobacteria don’t qualify as plants in the least, because they’re unicellular prokaryotes, where plants are multicellular eukaryotes. Similarly, diatoms, like other protists, although they are eukaryotic, are also unicellular and therefore lack the structure we associate with plants, so they’re classified separately, and referred to as plant-like protists. Seaweeds and kelps are other stories. There are three different groups of seaweed: red, green, and brown, and that they are all capable of photosynthesis. These organisms also can be mentioned as macroalgae, so they’re still not technically plants. But if you check out seaweed, it's blades that appear as if leaves, a stipe that appears sort of a stem, and holdfasts that appear as if roots. So thanks to these and lots of other morphological and genetic similarities, we will see that certain sorts of algae must be the ancestors of the land plants we’re more familiar with, and it's the case that true plants began to develop ashore around 500 million years ago. There are two different main groups of true plants. These are vascular and nonvascular plants. Nonvascular plants are usually small and comparatively simple in their structure. This is because they have a lack of the xylem and the phloem vascular tissues. Without vascular tissues, these simple plants haven't any thanks for transporting water and nutrients long distances through their bodies, in order that they don’t have long stems or complicated structures. Nonvascular plants also do not have roots but instead, they hold onto their substrate by using tiny hairs called rhizoids. As you would possibly expect, since their structures and reproduction are much simpler, nonvascular plants are much older on the evolutionary timeline than vascular plants. Some samples of nonvascular land plants are mosses, liverworts, and hornworts. On the opposite hand, the more complex and more recently-evolved vascular plants have complex structures. Vascular plants have xylem and phloem tissue which facilitate the transport of water and nutrients through a plant’s body allowing it to grow very large. These vascular tissues also leave more complex structures like roots, long stems, and branches. Now that we all know the essential differences between vascular and nonvascular land plants, let’s use subsequent few tutorials to require a better check out these groups, and specific types of plants within them, in order that we will understand their structures and their reproductive systems, also as how these different capabilities arose from an evolutionary perspective.
CHARACTERISTICS OF PLANTS-
Plants live organisms of the dominion Plantae; which incorporates multicellular groups like halophytes, an example may be a spirogyra, bryophytes an example is moss, pteridophytes an example may be a fern or gymnosperms an example is pinus and angiosperms example is a bauhinia acuminate. One of the striking features of plants is that they characteristically obtain most of their energy from sunlight through the method referred to as photosynthesis. Plants have chlorophyll to capture light energy from the sun which produces food sugar, starch, and various other carbohydrates. To do our experiment we'll require the subsequent plants.Spirogyra, Agaricus, Moss, Fern, Pinus and an Angiosperm plant. Let us now study the characteristics of the various pants.
CHARACTERISTIC OF SPIROGYRA
A Spirogyra comes under underthe group Chlorophyta and commonly occurs in freshwater bodies like ditches, ponds, lakes, etc. A Spirogyra is Usually called water silk because it has a silky appearance and texture. It is a filamentous green alga with more than 500 species in the world. Each filament is unbranched and consists of cylindrical cells placed end to finish. Each cell has one or more beautiful spiral chloroplast which provides it a dark green appearance. Cytoplasm lies within the periphery of the cell enclosing a vacuole within the center. Identifying Features of the Group they need a thalloid body, which suggests the body isn't differentiated into root, stem, and leaf. The plant cell contains chlorophyll and other pigments. They are autotrophs and predominantly aquatic.
CHARACTERISTIC OF AGARICUS
Agaricus is a fleshy saprophytic fungus that contains both edible and poisonous species with over 300 varieties. It is usually found during wet climates. It grows on wood and in humus-rich soil. The upper visible part above the bottom is named basidiocarp. The members of Agaricus have a fleshy cap called pileus. From the underside of Agaricus grows a variety of radiating plates called gills. The gills are of bear club-shaped basidia on a side and it carries basidiospores. Identifying Features of the Group Agaricus doesn't possess the pigment chlorophyll. It is saprophytic in nutrition.
CHARACTERISTIC OF MOSS
Moss may be a Bryophyte that grows On moist brick walls, and as thick mats on forest floors. It is green and is differentiated into rhizoids, axis, and leaves. Rhizoids are multicellular organisms that help to anchor the plants. The main axis bears antheridia at its apex. A lateral branch called female shoots bears archegonia at its tip. After fertilization, a very dependent sporophyte develops on the feminine shoot. The sporophyte is differentiated into three groups- foot, seta, and capsule. The capsule encloses the sporangium that produces spores. Identifying the Features of the Group. The plant's body is green, leafy, and bears rhizoids. It is a non-flowering autotroph plant. It does not bear specialized conducting tissues.
CHARACTERISTICS OF FERN
Ferns belong to the lower tracheophyte Pteridophyta and are found in humid and shady places. The young leaves usually unroll from a decent fiddlehead or circinate leaf. The leaflets are small and are arranged on the side of the rachis. It doesn't produce seeds or flowers but reproduces through spores. The stem is mostly an underground creeping rhizome. The Clusters of the adventitious roots arise from the underside of the stem near each node. The gametophyte within the plant is reduced to a little kidney-shaped prothallus, which containsAntheridia and Archegonia. Identifying the Features, Ferns are vascular plants that have xylem and phloem tissue for the conduction of food and water. They have stems, leaves, and roots. The adult plant is sporophytic dominant.
CHARACTERISTIC OF PINUS
The pinus may be a Gymnosperm which is an evergreen tall tree differentiated into root, stem, and leaves. The stem of the tree is roofed with bark. The vascular system is well developed. A pinus tree is monoecious and bears both male and feminine cones. It produces naked seeds, which suggests that the seeds aren't enclosed in fruit. Male cones are born in clusters on the long branches. The male cone consists of varied spore-bearing leaves, the microsporophylls, arranged spirally on the central axis. A mature cone may be a dark brown in color. Each microsporophyll features a stalk, broad lamina, and tip curved upwards to suit the microsporophyll above. It bears two sporangia on its lower surface. The sporangia are crammed with numerous winged microspores, the haploid male gametophyte. Female cones are born singly on the long branches and the mature cones are brown in color. It contains some bract scales that are arranged spirally on the central axis. In the axils of every bract scale, an ovuliferous scale is present, called the microsporophyll. It bears two ovules on the side and every one of the ovules has integument nucellus and feminine gametophyte. Identifying Features The seeds are naked. The reproductive organs are cones. Well-developed xylem and phloem tissues are present.
CHARACTERISTIC OF AN ANGIOSPERMOUS PLANT
(Bauhiniaacuminata) Bauhinia acuminata may be a species of an angiosperm plant native to tropical southeastern Asia. The leaves also have a special reticulate venation. It bears flowers that are reproductive organs. The flower has five petals so pentamerous. They have taproots by having a little number of roothairs. It produces seeds that are enclosed in the fruit. Identifying Features Angiosperms are vascular plants. They have various flowers which are the reproductive parts of the plants. The seeds are covered as they're enclosed inside the fruit.
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