What Is Meant By Alternation Of Generations Botany Lab Key
Cryptogams are classified as lower plants because they don't have many of the structures we associate with plants. In part, this is because most cryptogams aren't even in the plant kingdom! There are two major trends you should focus on in today's lab. The first is a transition in life cycles, the second is a change in basic internal structure. First, all plants undergo an alternation of generations, between a haploid gametophyte stage and a diploid sporophyte stage. In the most primitive plants, like mosses, the gametophyte is. Alternation of generations, also called metagenesis or heterogenesis, in biology, the alternation of a sexual phase and an asexual phase in the life cycle of an organism. The two phases, or generations, are often morphologically, and sometimes chromosomally, distinct. Apr 29, 2011 What is the meaning of morning in nagrebcan. Where is purell manufactured. Botany or Plant Biology. All plants have a life cycle that is characterized by?
- What Is Meant By Alternation Of Generations Botany Lab Key Code
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- Syngamy
Botany is the study of plants. Plants are very similar to people in a lot of ways, but they also have some differences that can be hard to wrap your brain around. And, like any science class, botany can get a little overwhelming at times. So here are a few items to help you grasp some of the big ideas in botany. Canon g2000 reset key generator torrent download.
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Parts of a Flower
Your botany teacher is making assignments for a research project on a plant species. She assigns you to study hemlock (Conium maculatum) and mentions that is an r-selected species. Based on this, what characteristics would you predict to be true of hemlock? Check all that apply. What is meant by alternation of generations in terms of a plant's life cycle? Be able to identify each generation when shown a plant life cycle. Life cycle between two Multicellular phases. In the gymnosperm life cycle, plants alternate between a sexual phase and an asexual phase. This type of life cycle is known as alternation of generations. Gamete production occurs in the sexual phase or gametophyte generation of the cycle. Spores are produced in the asexual phase or sporophyte generation.
Flowers can be unisexual, having only male or female parts, or bisexual, having both types of parts. The male parts of a flower make up the stamens. The entire whorl of stamens in the flower is called the androecium.
What Is Meant By Alternation Of Generations Botany Lab Key Code
The sac-like structures at the top of the stamen are the anthers. The anthers house pollen, which contain the male gametophytes that make the sperm. The thread-like stalks that lift the anthers up are called filaments.
The female parts of the flower make up the pistils. The entire whorl of pistils in the flower, which may be separate or fused together, is called the gynoecium.
The sticky tips at the top of the pistils that receive pollen are called stigmas. The swollen bases of the pistils are the ovaries. Inside the ovaries are tiny pearl-like structures called ovules. The ovules contain the female gametophytes, which make the eggs. The slender stalks that connect each stigma to an ovary are called styles.
What Is Meant By Alternation Of Generations Botany Lab Key Largo
Alternation of Generations in a Plant Life Cycle
During the life cycle of a plant, the plant alternates between two forms: the sporophyte generation and the gametophyte generation. So, a complete plant life cycle includes both generations.
| Characteristics | Sporophyte Generation | Gametophyte Generation |
|---|---|---|
| Ploidy (# of sets of chromosomes) | Diploid (2 sets of chromosomes) | Haploid (1 set of chromosomes) |
| Types of cell division and what they’re used for | Mitosis to grow Meiosis to produce haploid spores, which begin the gametophyte generation | Mitosis to grow Mitosis to produce haploid gametes, which join together to form the sporophyte generation |
| How the generation begins | Begins when haploid gametes (sperm and egg) fuse to form a diploid zygote | Begins when the sporophyte produces a haploid spore |
| What it looks like in different kinds of plants | Most visible form in ferns, gymnosperms, and angiosperms Small structures on mosses and lycophytes that grow on the gametophytes | Most visible form in mosses and lycophytes Small but independent structure in ferns’ very small structures in gymnosperms and angiosperms that are enclosed by the sporophyte |
Types of Plant Tissues
Plant tissues come in several forms: vascular, epidermal, ground, and meristematic. Each type of tissue consists of different types of cells, has different functions, and is located in different places.
Syngamy
| Tissue | Cell Types | Function | Locations |
|---|---|---|---|
| Vascular tissue | Xylem is made up of vessels and tracheids Phloem is made up of sieve cells and companion cells | Xylem transports water Phloem transports sugars | In stems, leaves, and roots |
| Epidermal tissue | Parenchyma | Protect plant tissues and prevent water loss | Outer layer of stems, roots, and leaves |
| Ground tissue | Parenchyma Collenchyma Sclerenchyma | Makes up bulk of plant mass | Stems, roots, leaves |
| Meristematic tissue | Parenchyma | Divide to produce new growth | Tips of shoots Tips of roots In buds In a ring around the stem in woody plants |