What Is Meant By Alternation Of Generations Botany Lab Key
- What Is Meant By Alternation Of Generations Botany Lab Key West
- What Is Meant By Alternation Of Generations Botany Lab Key West
- Alternation Of Generations Examples
- What Is Meant By Alternation Of Generations Botany Lab Keyboard
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.
Parts of a Flower
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.
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.
Science Talk Archive. Exploring the science of plants, from the field to the lab. Exploring the Mountains of Eastern Cuba, Part I. Posted in Travelogue on April 24, 2014 by Fabian Michelangeli. Michelangeli, Ph.D., is an Associate Curator of the Institute of Systematic Botany at The New York Botanical Garden. His research focuses in. The detailed study of reproductive structures in plants led to the discovery of the alternation of generations found in all plants and most algae. This area of plant morphology overlaps with the study of biodiversity and plant systematics. Thirdly, plant morphology studies plant structure at a range of scales. Vascular plants exhibit, like all plants, an alternation of generations. This means that there are two forms of the plant, the sporophyte and the gametophyte. The sporophyte, a diploid organism, goes through meiosis to produce the haploid spore. The spore grows into a new organism, the gametophyte. Jul 03, 2018 The main difference between haplontic and diplontic life cycle is that the main form of the haplontic life cycle is haploid and its diploid zygote is formed for a short period of time whereas the main form of the diplontic life cycle is diploid, which produce gametes. Furthermore, most algae, most fungi, and lower plants have a haplontic life cycle while animals, higher plants have a diplontic. BIOL 202 – Botany Spring 2009 1 Botany Laboratory 10 Bryophytes and Seedless Vascular Plants Chapters 16,17: pages 345 ‐ 407 INTRODUCTION AND OBJECTIVES This is the first of several labs focusing on land plants – a major clade that is referred to as Kingdom Plantae. Botany, also called plant science(s), plant biology or phytology, is the science of plant life and a branch of biology.A botanist, plant scientist or phytologist is a scientist who specialises in this field. 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 dominant (i.e. It's big and green).
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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 West
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.
What Is Meant By Alternation Of Generations Botany Lab Key West
| 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 |
Alternation Of Generations Examples
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.
What Is Meant By Alternation Of Generations Botany Lab Keyboard
| 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 |