Plant Science
A Place to Call Home
How to meet the needs of perennial plants by considering light, community, soil, air, water, and temperature.
Asteraceae
This lesson contains information about the flower, fruit, foliage, and form of plants in the Asteraceae family. Additional resources on its uses in plant landscapes, how to grow them, and control pests and diseases are included.
Backcross Breeding 1 - Basic Gene Inheritance
This lesson reviews the basics of gene inheritance. It compares plants that are homozygous, heterozygous, and hemizygous for an allele and how gene expression is affected by the dominance of an allele. It also explains how to use a Punnett square to predict genotypic and phenotypic ratios of offspring.
Flowering Principles
What is a "flower" and what are its structures? How do the male and female parts operate to produce seed? Monoecious versus dioecious; perfect versus imperfect.
Herbicides That Act Through Photosynthesis
This lesson will examine herbicides that adversely affect light-related processes, thereby causing damage to plants. There are four basic mechanisms that will be studied in this class of agents: herbicides that inhibit or block synthesis of Protoporphyrin IX; herbicides that inhibit synthesis of carotenoids; herbicides that block Photosystem II electron transfer; and herbicides that divert electrons from Photosystem I. All share the ability to cause cellular damage in the presence of light.
Herbicidas que Actúan A través de la Fotosíntesis
En esta lección se examinarán los herbicidas que afectan los procesos celulares relacionados con la utilización de la luz, causando así daños a las plantas. Existen cuatro mecanismos básicos que serán estudiados: herbicidas que obstruyen la síntesis de protoporfirina IX; herbicidas que inhiben la síntesis de carotenoides; herbicidas que obstruyen la transferencia de electrones en el fotosistema II; y herbicidas que substraen electrones del fotosistema I. Todos ellos comparten la misma habilidad de causar daños celulares en presencia de luz.
Just the facts
Description of the fundamental concepts of trait inheritance in sexually reproducing species.
Mitosis and Meiosis and the Cell Cycle
Multicellular organisms such as plants and animals are composed of millions to trillions of cells that work together. This lesson details the steps of somatic cell division to produce identical cells by mitosis and germline cell division to produce gametes by meiosis. Emphasis is on what is happening genetically as these new cells are made in multicellular, sexually reproducing organisms.
Basic Biotechnology
An introduction to traditional cross-breeding and biotechnology, particularly genetic engineering. Includes the historical uses of biotechnology, the definition of biotechnology, and examples of biotechnology.
Perennial Plant Response to Defoliation - An Overview
Compares the growth of defoliated and non-defoliated perennial plants, with an emphasis on the link between plant structure, growth, and response to defoliation.
Plant Pigments and Photosynthesis
This lesson will examine the two major classes of phototsynthetic pigments, chlorophylls and carotenoids, their biochemical structures and their biosynthesis. The organization of these pigments into photosynthetic pigment, which are protein complexes that harvest light and convert its energy into biochemical energy will be explained.
Transpiration - Water Movement through Plants
This lesson and its animation follows the journey of water through a plant from its uptake by roots to its evaporation from the leaf surface. How this journey is altered by plant characteristics such as stomata and cuticles as well as by changes in the environment will be described.