搜尋結果
Pterygota is a subclass of insects that includes the winged insects. It also includes insect orders that are secondarily wingless. That means insect groups whose ancestors once had wings but that have lost them later in evolution . The Pterygota today includes almost all insects. That is because flying led to a great radiation of insect types.
- Types of Plants
- The Plant Food Factory
- Roots
- Flowering Plant Reproduction
- Fossils
- Related Pages
Green algae: 1. Chlorophyta 2. Charophyta Land plants (embryophyte) 1. Non-vascular plants (bryophytes): 1.1. Liverworts 1.2. Mosses 1.3. Hornworts 1.4. †Horneophytopsida 2. Vascular plants (tracheophytes) 2.1. Lycopodiophyta—clubmosses 2.2. Pteridophyta: the ferns 2.2.1. Pteridopsida: the typical ferns 2.2.2. Sphenopsida: the horsetails 2.2.3. Mar...
At least some plant cells contain photosynthetic organelles (plastids) which enable them to make food for themselves. With sunlight, water, and carbon dioxide, the plastids make sugars, the basic molecules needed by the plant. Free oxygen (O2) is produced as a by-product of photosynthesis. Later, in the cell cytoplasm, the sugars may be turned into...
The roots of plants perform two main functions. First, they anchor the plant to the ground. Second, they absorb water and various nutrients dissolved in water from the soil. Plants use the water to make food. The water also provides the plant with support. Plants that lack water become very limp and their stems cannot support their leaves. Plants w...
Flowers and pollination
Flowers are the reproductive organ only of flowering plants (Angiosperms). The petals of a flower are often brightly colored and scented to attract insects and other pollinators. The stamen is the male part of the plant. It is composed of the filament (a stalk) that holds the anther, which produces the pollen. Pollen is needed for plants to produce seeds. The carpel is the female part of the flower. The top part of the carpel contains the stigma. The style is the neck of the carpel. The ovary...
Seed travelers
A plant produces many spores or seeds. Lower plants such as moss and ferns produce spores. The seed plants are the Gymnospermsand Angiosperms. If all the seeds fell to the ground besides the plant, the area might become overcrowded. There might not be enough water and minerals for all the seeds. Seeds usually have some way to get to new places. Some seeds can be dispersed by the wind or by water. Seeds inside juicy fruits are dispersed after being eaten. Sometimes, seeds stick to animals and...
The question of the earliest plant fossils depends on what is meant by the word "plant". 1. If by plants we mean phototrophs using chlorophyll, then cyanobacteria in stromatolites are the first fossils, 3,450 million years ago (mya) in the Archaean eon. The remarkable precision is possible because the fossils were sandwiched between lava flows that...
Magnoliophyta. Class: Magnoliopsida. Magnoliopsida or dicotyledons is the name of a class of plants in taxonomy. They are also called dicots. It is the biggest group of flowering plants. Seedlings in this group have two seed leaves. Monocots have one seed leaf.
Flowering plant. Flowering plants are plants that bear flowers and fruits. Most land plants today are flowering plants ( Angiosperm or Magnoliophyta ). Together with the gymnosperms they make up the seed plants. They differ from the gymnosperms in that angiosperms have flowers, and have enclosed ovules.
The baobab tree is known as the tree of life, with good reason. It can provide shelter, clothing, food, and water for the animal and human inhabitants of the African savannah regions. The cork-like bark and huge stem are fire resistant and are used for making cloth and rope. The leaves are used as condiments and medicines.
List of U.S. states. This article lists the 50 states of the United States. It also lists their populations, the date they became a state or agreed to the United States Declaration of Independence, their total area, land area, water area, and the number of representatives in the United States House of Representatives.
Varanidae. Genus: Varanus. Monitor lizards, the genus Varanus, are also known as biawak or goannas. They are members of the family Varanidae. Their closest living relatives are the anguid and Heloderma lizards. Varanus is a genus of largely carnivorous lizards. There are about 60 species in 10 subgenera. The species cover a vast area, occurring ...
