(i) Syngenesious: Filaments free and anthers united, e.g., Sunflower.
(ii) Synandrous: Stamens fused all through their length, e.g., Cucurbita
(iii) Adelphous: Anthers remain free and filaments are united.
Adelphous condition can be
(a) Monoadelphous—United to form 1 bundle, e.g., China rose
(b) Diadelphous—United to form 2 bundles, e.g., Pea (c) Polyadelphous—United into more than two bundles, e.g., Lemon
(i) Epipetalous: Stamens fused with petals, e.g., Sunflower, Datura
(ii) Epiphyllous: Stamens fused with perianth, e.g., Lily
(ii) Adnate: Filament attached along the whole length of anther, e.g., Michelia, Magnolia
(iii) Dorsifixed: Filament attached to the back of anther, e.g., Passion flower
(iv) Versatile: Anther lobes attached with filament in the middle portion with both ends free, e.g., Gramineae family
(ii) Longitudinal: Pollens released through the longitudinal slit of another lobes, e.g., China rose, Cotton
(ii) Perigynous: Other floral parts are attached around the ovary, e.g., Apple, Guava (iii) Hypogynous: Position of ovary superior to other floral parts, e.g., Sunflower | |
(i) Apocarpous: Carpels are free. Each carpel has its own style and stigma, e.g., Rose (ii) Syncarpous: Carpels are united, e.g., Lady’s finger, Tomato | |
(i) Unilocular: One locule, e.g., Rose, Pea (ii) Bilocular: Two locules, e.g., Datura (iii) Multilocular: Many locules, e.g., Lady’s finger, China rose | |
(ii) Axile: The ovary is partitioned into several chambers or locules and the placentae are borne along the septa of the ovary, e.g., Tomato, China rose (iii) Parietal: The ovules develop on the inner wall of the ovary or on peripheral part. Ovary unilocular but in some cases becomes two chambered due to formation of a false septum, e.g., Mustard (iv) Free central: Ovules are borne on the central axis and septa are absent, e.g., Carnation, Chilly (v) Basal: Placenta develops at the base of the ovary, e.g. ,Sunflower. |
Phet™ labs, biology labs on-line.
All PhET simulations are available for free from the PhET website. They are written in Java and Flash, and can be run using a standard web browser as long as Flash and Java are installed. The PhET project is hard at work increasing the accessibility of their simulations , and a number of PhET simulations have accessibility features .
There are 19 simulations in the PhET Biology Collection . Here are some highlights:
Online Activity Labs: | Topics: |
---|---|
| Build a gene network! The lac operon is a set of genes which are responsible for the metabolism of lactose in some bacterial cells. Explore the effects of mutations within the lac operon by adding or removing genes from the DNA. |
| Insert channels in a membrane and see what happens. See how different types of channels allow particles to move through the membrane. |
| Explore natural selection by controlling the environment and causing mutations in bunnies. |
| Stimulate a neuron and monitor what happens. Pause, rewind, and move forward in time in order to observe the ions as they move across the neuron membrane. |
| Explore stretching just a single strand of DNA using optical tweezers or fluid flow. Experiment with the forces involved and measure the relationship between the stretched DNA length and the force required to keep it stretched. Is DNA more like a rope or like a spring? |
These are collection of lab activities developed from the Virtual Courseware Project at Cal State University-Los Angeles. The following experiments offer a series of interactive, inquiry-based biology simulations and exercises designed for college and AP high school biology students.
Online Activity Labs: | Topics: |
---|---|
Students explore the concept of homeostasis using arterial blood pressure as an example. The interaction of variables related to heart rate, vessel radius, blood viscocity, and stroke volume can be studied by direct manipulation, or indirectly through interventions, such as hemorrhage, exercise, dehydration, shock, intravenous infusion, epinephrine, and foxglove. Nerve impulses can be monitored under the experimental conditions. Realistic case studies such as hypertension and congestive heart failure are also available for investigation. | |
Students investigate how differences in population size, age-structure, and age-specific fertility and mortality rates affect human population growth. This lab can be used to investigate phenomena such as exponential growth, stable age structure, zero population growth, and demographic momentum. | |
Students study properties of enzymatic reactions by photometrically measuring the initial rate of synthesis of a product. Enzyme principles that can be investigated with this lab are pH and temperature optimums, Michaelis-Menton constants such as Km, Ki and Vmax, and the different classes of inhibitors. | |
Students investigate the process of adaptation by natural selection by manipulating various parameters of a bird species, such as initial mean beak size, variability, heritability, and population size, and various parameters of the environment such as precipitation and island size. This lab can be used to investigate evolutionary principles such as directional, disruptive and balancing selection, the dependence of natural selection on the variability and heritability of a trait, founder effects, genetic drift, and extinction. | |
Students learn the principles of genetic inheritance by designing matings between female and male fruit flies carrying one or more genetic mutations. This lab can be used to demonstrate genetic principles such as dominant versus recessive traits, independent assortment, sex-linked inheritance, linkage and chromosome maps, and modifications to Mendelian ratios caused by lethal mutations and epistasis. | |
Students study the relationship of the structure and function of hemoglobin to the structure and function of human red blood cells. They use techniques such as gel electrophoresis, peptide sequencing, and computer modeling to study hemoglobin structure. They can investigate how mutations in hemoglobin genes affect its polypeptide sequence and relate these effects to the symptoms of individual case studies. | |
Students measure photosynthetic rates of leaves by carbon dioxide assimilation. They investigate how photosynthetic rates change as a function of light intensity, light quality, temperature, and ambient carbon dioxide. This lab can be used to demonstrate concepts such as dark respiration, photochemical efficiency, carbon dioxide conductance, light compensation points, photosynthetic saturation, and differences in photosynthetic rates of C-3 versus C-4 plants, sun versus shade plants, and different levels of polyploidy. | |
Students measure the oxygen consumption of mitochondrial extracts in the presence of different substrates, inhibitors, and ADP to investigate the TCA cycle, electron transport, and oxidative phosphorylation. Seven substrates and six inhibitors can be used in any order or combination by the student, providing the flexibility for a number of different experiments. | |
Students use pedigree analysis to study the inheritance of genes for human genetic disorders and RFLP analysis to study recombination in humans. Using RFLPs as genetic markers, students search a simulated pedigree database to obtain recombination data that allows them to determine the location of human genes on chromosomes. | |
Students investigate principles of population ecology by manipulating various attributes of three bird species: two competing sparrows and a hawk predator. Users can vary initial population numbers, clutch size, life span, competition coefficients, predation rates and resource availability. This lab can be used to investigate ecological principles such as carrying capacity, extinction, overpopulation, competitive coexistence, competitive exclusion, predator-prey cycles, and predator-mediated coexistence. | |
Students track changes in the genotype and allele frequencies in populations of moths to study population genetic principles such as Hardy-Weinberg ratios, genetic drift, natural selection, migration, assortative matiing, and population bottlenecks. Experiments can be conducted by manipulating parameters such as the initial genotype frequencies, the carrying capacity of each population, the rates of predation on the moth phenotypes, the migration rates among populations, mating preferences among phenotypes, and the frequency of population "crashes." | |
Students create simple RNA sequences and then translate these in a virtual "in vitro" cell-free system. From the proteins produced by the translation mix, students determine the characteristics of the genetic code and assign codons to amino acids. This lab was modeled after some of the original experiments used to determine the genetic code. |
Website: | Topics: |
---|---|
| |
Website: | Topics: |
---|---|
| The lists free biology resources designed to support remote biology education. |
Website: | Topics: |
---|---|
| The - provides high quality online educational resources for teaching and learning, with current emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplines–both formal and informal, institutional and individual, in local, state, national, and international educational settings. The NSDL collection contains structured descriptive information (metadata) about web-based educational resources held on other sites by their providers. These providers have contribute this metadata to NSDL for organized search and open access to educational resources via this website and its services. |
Are you using free Virtual Lab materials you found on the web in your teaching or your learning? Have you posted free Virtual Labs online that are open for others to use? We invite you to catalog these Virtual Labs you use or authored in MERLOT. Your colleagues and students around the world will thank you!
First: Become a member of MERLOT (It will take about 2 minutes and it’s FREE).
Second: Log in to MERLOT and click to Add a Material . (It will take about 4 minutes the first time and step-by-step instructions for contributing materials to MERLOT are available).
MERLOT Virtual Labs is a service of the MERLOT program. Concept and design by: MERLOT and CSULB Center for Usability In Design and Accessibility © 2020 California State University, Long Beach - MERLOT Accessibility Questions? Email [email protected]
IMAGES
VIDEO
COMMENTS
CBSE Class 12 Practical Biology helps students to do experiments and learn the various concepts of Biology. Furthermore, the syllabus for the CBSE practical exam for Class 12 Biology introduces concepts that are likely to be taught in professional courses such as MBBS and BDS.
Covers Practical Experiments: The manual has a series of practical exercises that students perform in the laboratory. These experiments cover various topics from the Class 12 Biology syllabus ...
Students can check the Biology Practical Class 12 CBSE syllabus below: A. List of Experiments: 1. Prepare a temporary mount to observe pollen germination. 2. Study the plant population density by the quadrat method. 3. Study the plant population frequency by the quadrat method. 4.
Out of the total 100 marks, the theory paper of Biology will carry 70 marks and the practical paper carries 30 marks in CBSE Class 12 Exams 2024. The Biology practical syllabus involves major and minor experiments, slide preparation, spotting, investigatory projects, viva voce, and other activities. CBSE Board recommends a total of 60 periods ...
Procedure. Take the available plant material and grind it in the mortar. Treat the material with cellulase to break down the cell wall of the plant cells. Next, treat it with protease to hydrolyze the peptide bonds of proteins in the plant material. In other words, the enzyme removes the histone proteins which are intertwined with the DNA.
Class XII Biology practical:- Isolate DNA from any plant material such as spinach, green pea seeds, papaya, etc.OTHER BIOLOGY PRACTICAL VIDEOS:-•How to do 's... CBSE Exam, class 12
Take the collected roadside soil and garden soil into two different beakers containing water. Mix the test tubes with the soil solution slowly. Now into a clean and dried two test-tube, arrange a funnel spread covered with a filter paper. Now gently pour the soil solutions into the test tubes separately. Let the water to completely filter off ...
CBSE Class 12 Biology Practicals 2023-24. Max. Marks: 30. Prepare a temporary mount to observe pollen germination. Study the plant population density by quadrat method. Study the plant population frequency by quadrat method. Prepare a temporary mount of onion root tip to study mitosis. Flowers adapted to pollination by different agencies (wind ...
The Biology Practical Notebook Class 12 Answers PDF provided by Vedantu cover a wide range of topics, including microbiology, plant physiology, genetics, and ecology. Students are required to perform experiments related to these topics and record their observations and findings in a lab manual. The practicals are designed to provide students with a comprehensive understanding of the concepts ...
Hence, CBSE Class 12 Practicals and Project Work form an important part of the CBSE Class 12 Biology curriculum since practicals and investigatory projects together carry 30 marks toward the ...
content based experiments, which help in comprehension of the concepts. There are altogether twenty-five exercises in the present manual which are based on Biology curriculum for Class XII. For each practical work, principle, requirements, procedure, precautions, observations, discussion and the questions are given in the book.
BIOs-360 Class 12. Biology important diagrams class 12; Biology Imprtant Questions; Biology Class 12 Exercises and Solutions ... Program List. More... Practical Experiments Class 12 . Exercise 01. To study the reproductive parts of commonly available flowers. Read More. Exercise 02. To calculate percentage of pollen germination. Read More ...
The pollen should be dusted on the surface of the stigma. Cover the pollinated flower immediately with a polythene bag and label it with the name of the seed parent. Also Read: Artifical Hybridization. Artificial Pollination. For any information on Biology experiments in CBSE Class 12, keep visiting BYJU'S website or download BYJU'S app for ...
in this video you can see class 12 biology practical file as per the latest syllabus with diagrams, readings, index, spotting , experiments .In this biology ...
The Biology Practical Class 12 is divided into experiments, spotting, and practicals and is part of the CBSE Class 12 board exam marking evaluation process. Candidates can review the CBSE 12th Biology Practical Syllabus 2024-25 stated below. Section A: List of Experiments. In this section, candidates must perform a set of experiments for five ...
This repository of Biology Class 12 lab experiments and its accompanying manual is a treasure trove for students delving into the world of Biomedical Engineering engineering. The manual provides a detailed roadmap for each experiment, outlining the required apparatus, step-by-step procedures, guidelines for observations, and a systematic format ...
CBSE Class 12 Biology Practical 2023-24 Syllabus A. List of Experiments . Prepare a temporary mount to observe pollen germination. Study the plant population density by quadrat method.
BIOs-360 Class 12. Biology important diagrams class 12; Biology Imprtant Questions; Biology Class 12 Exercises and Solutions; 2nd PU Biology Question Papers; ... (Class XI) and at the end of this experiment. (ii) Observe the flower with the naked eye, hand lens or under a dissecting microscope. Study their reproductive parts and count the ...
This lab can be used to investigate evolutionary principles such as directional, disruptive and balancing selection, the dependence of natural selection on the variability and heritability of a trait, founder effects, genetic drift, and extinction. Details and get access to EvolutionLab. Check out EvolutionLab. FlyLab.
Few examples of flowers pollinated by birds include: Hibiscus. Fuchsias. Verbenas. Beebalms. Bromeliads. Also Read: Types of Pollination. Learn more in detail about the different types of disease, the causing agents, other related topics and experiments at BYJU'S Biology.