0
The gymnosperms are all woody perennial plants and include several orders, of which most important are the conifer, the ginkgo, and the cycad. The angiosperms are separated into the monocotyledonous plants-usually with one cotyledon per seed, scattered vascular bundles in the stem, little or no cambium, and parallel veins in the leaf-and the dicotyledonous plants-which as a rule have two cotyledons per seed, cylindrical vascular bundles in a regular pattern, a cambium, and net-veined leaves. There are some 50,000 species of monocotyledon, including the grasses (e.g., bamboo and such cereals as corn, rice, and wheat), cattails, lilies, bananas, and orchids. The dicotyledons contain nearly 200,000 species of plant, from tiny herbs to great trees; this enormously varied group includes the majority of plants cultivated as ornamentals and for vegetables and fruitThe plant kingdom traditionally was divided into two large groups, or subkingdoms, based chiefly on reproductive structure. These are the thallophytes (subkingdom Thallobionta), which do not form embryos, and the embryophytes (subkingdom Embryobionta), which do. All embryophytes and most thallophytes have a life cycle in which there are two alternating generations (see reproduction). The plant form of the thallophytes is an undifferentiated thallus lacking true roots, stems, and leaves. The subkingdom Thallobionta is composed of more than 10 divisions of algae and fungi (once considered plants). The subkingdom Embryobionta is composed of two groups: the bryophytes (liverwort and moss), division Bryophyta, which have no vascular tissues, and a group consisting of seven divisions of plants that do have vascular tissues. The Bryophyta, like other nonvascular plants, are simple in structure and lack true roots, stems, and leaves; they therefore usually live in moist places or in water.
The vascular plants have true roots, stems, and leaves and a well-developed vascular system composed of xylem and phloem for transporting water and food throughout the plant; they are therefore able to inhabit land. Three of the divisions of the vascular plants are currently represented by only a very few species. They are the Psilotophyta, with only three living species; the Lycopodiophyta (club mosses); and theEquisetophyta (horsetails). All the plants of a fourth subdivision, the Rhyniophyta, are extinct. The remaining divisions include the dominant vegetation of the earth today: the ferns (see Polypodiophyta), the cone-bearing gymnosperms (see Pinophyta), and the angiosperms, or true flowering plants (see Magnoliophyta). The latter two classes, because they both bear seeds, are often collectively called spermatophytes, or seed plants.
What else can I help you with?
Why was plant eating harder than meat eating for dinosaures?
Digesting plant material is more difficult for animals than digesting meat. That is because cell walls and fiber hinder an animals ability to digest plants.
Why was plant eating more difficult for dinosaurs than meat eating?
Plant cells contain cell walls, which make it more difficult for them to be digested than animal cells. This is why herbivorous animals, including dinosaurs, have longer, more complex digestive systems than carnivores.
Are plant cell usually smaller or larger than animal cell?
plant cell - is bigger than animals cell
What is mutant plant?
A mutant plant is a plant that develops differently than what it should. This is the same concept for mutant animals.
How are plant and animals life dependent on the water cycle?
all the plant and animals depend on the water cycle some more than others
Animals that feed on plant eaters are no lower than what?
Animals that feed on plant eaters are no lower than secondary consumers in the food chain. They are usually referred to as tertiary consumers, which are organisms that consume primary consumers (plant eaters).
What is Categorization in database management system?
modeling of a single sub class with a relationship that involve more than one super class each called categorization.
Why was plant eating more difficult for dinosarus than meat eating?
Plant eating was more difficult because back in the time of the dinosaurs, plants were usually tough and thick and hard to chew through.
Is fungy a tipe of plant?
No, fungus is not a type of plant. Fungi are a separate kingdom of organisms that are distinct from plants, animals, and bacteria. Fungi are more closely related to animals than plants.
Do animals have vacoule cells?
yes, much smaller than a plant cell's
When animals eat plants what effect happens?
it depends on the plant really, if its a vegetable or fruit plant its fine, but not for more than three meals. Some animals are herbivores, who can live on it full time, and carnivores cant live on it for more than three meals. if its a poisonous plant, the will get sick (both)
Was most of the dinosaurs plant eaters or meat eaters?
Most dinosaurs were plant eaters. This is because plants are more common than animals.
