Biology ppt for class 12

Chapter Reproduction in Organisms Reproduction, a characteristic feature of all organisms for continuation of species; modes of reproduction — asexual and sexual reproduction; asexual reproduction — binary fission, sporulation, budding, gemmule formation, fragmentation; vegetative propagation in plants.

Chapter Sexual Reproduction in Flowering Plants Flower structure; development of male and female gametophytes; pollination — types, agencies and examples; outbreeding devices; pollen-pistil interaction; double fertilization; post fertilization events — development of endosperm and embryo, development of seed and formation of fruit; special modes-apomixis, parthenocarpy, polyembryony; Significance of seed dispersal and fruit formation.

Chapter Human Reproduction Male and female reproductive systems; microscopic anatomy of testis and ovary; gametogenesis — spermatogenesis and oogenesis; menstrual cycle; fertilisation, embryo development upto blastocyst formation, implantation; pregnancy and placenta formation elementary idea ; parturition elementary idea ; lactation elementary idea. Chapter Human Health and Diseases Pathogens; parasites causing human diseases malaria, dengue, chickengunia, filariasis, ascariasis, typhoid, pneumonia, common cold, amoebiasis, ring worm and their control; Basic concepts of immunology — vaccines; cancer, HIV and AIDS; Adolescence — drug and alcohol abuse.

Chapter Strategies for Enhancement in Food Production Improvement in food production: Plant breeding, tissue culture, single cell protein, Biofortification, Apiculture and Animal husbandry. Chapter Microbes in Human Welfare In household food processing, industrial production, sewage treatment, energy generation and microbes as biocontrol agents and biofertilizers.

Antibiotics; production and judicious use. Chapter Biotechnology and its Application Application of biotechnology in health and agriculture: Human insulin and vaccine production, stem cell technology, gene therapy; genetically modified organisms — Bt crops; transgenic animals; biosafety issues, bio piracy and patents.

Chapter Organisms and Populations Organisms and environment: Habitat and niche, population and ecological adaptations; population interactions — mutualism, competition, predation, parasitism; population attributes — growth, birth rate and death rate, age distribution.

Chapter Ecosystem Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy; nutrient cycles carbon and phosphorous ; ecological succession; ecological services — carbon fixation, pollination, seed dispersal, oxygen release in brief. Chapter Biodiversity and its Conservation Concept of biodiversity; patterns of biodiversity; importance of biodiversity; loss of biodiversity; biodiversity conservation; hotspots, endangered organisms, extinction, Red Data Book, biosphere reserves, national parks, sanctuaries and Ramsar sites.

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Chapter Environmental Issues Air pollution and its control; water pollution and its control; agrochemicals and their effects; solid waste management; radioactive waste management; greenhouse effect and climate change; ozone layer depletion; deforestation; any one case study as success story addressing environmental issue s.

Spermiation It is the process when mature spermatozoa are released from the sertoli cells into the lumen of seminiferous tubules. The death rate has decreased in the past 50 years.

The factor leading to decreased death rate and increased birth rate are control of diseases, awareness and spread of education, improvement in medical facilities, ensured food supply in emergency situation, etc. All this has also resulted in an increase in the longevity of an individual. Join the Discussion forum and ask your doubts. Select the Chapter for 12th Biology Solutions.

Important Questions on 12th Biology Offspring formed due to sexual reproduction have better chances of survival. Is this statement always true?

biology ppt for class 12

Sexual reproduction involves the fusion of the male and the female gamete. This fusion allows the formation of new variants by the combination of the DNA from two usually different members of the species.

The variations allow the individuals to adapt under varied environmental conditions for better chances of survival.

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However, it is not always necessary that the offspring produced due to sexual reproduction has better chances of survival. Under some circumstances, asexual reproduction is more advantageous for certain organisms.

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For example, some individuals who do not move from one place to another and are well settled in their environment. Also, asexual reproduction is a fast and a quick mode of reproduction which does not consume much time and energy as compared to sexual reproduction. What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.

Chasmogamous flowers have exposed anthers and stigmata similar to the flowers of other species. Cross-pollination cannot occur in cleistogamous flowers. This is because cleistogamous flowers never open at all. Also, the anther and the stigma lie close to each other in these flowers. Hence, only self-pollination is possible in these flowers. Define spermiogenesis and spermiation. Spermiogenesis It is the process of transforming spermatids into matured spermatozoa or sperms. What are the suggested reasons for population explosion?

The human population is increasing day by day, leading to population explosion. It is because of the following two major reasons.Published on Mar 28, Effects of Fertilisers, Manure and Polythene on therate of elongation of the Hypocotyl.

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What is the Best Way to Disinfect a Toothbrush. Study on Probiotics and their Preparation. Testing the toxicity of Marine Pollutants using Daphnia. Eye Disorders in Children and Adolescents. Yeast Reproduction in Sugar Substitutes. Factors Affecting Nodule Formations in Legumes. Investigating Seed Tolerance for Freezing Temperatures. Can You Make the Grade.

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Effects of Reading and Working on the Computer on Vision. Effect of the Timing of the Application of Potassium on Antirrbinum. Comparison of the Effectiveness of Organic Worm Castings. Physiology of Plants in a Simulated Martian Atmosphere.

Growth Rate of Poa pratensis in Pure Humus. Nail-Patella Syndrome Phenotype Expression. Effect of Pupil Dilation on Peripheral Vision. Effects of Various Aromas on Animal Behavior. Effects of Temperature on Bacterial Pigmentation. Isolation of Staphylococcus aureus from Raw and Pasteurized Milk. Study of the Health Benefits of Spicy Cooking. Bacteria Affected by Ultra-Violet Light.Ecology is basically concerned with four levels of biological organisation — organisms, populations, communities and biomes.

CBSE - Class 12 - Biology

In this chapter, students shall explore ecology at organismic and population levels. This chapter deals with topics such as organisms and its environment, niche, major abiotic factors affecting the organisms and its environment such as temperature, water, light, soil, responses to abiotic factors such as regulation, conformation, migration and suspension; adaptations, population attributes, population growth, natality, mortality, immigration, emigration; growth models of exponential growth and logistic growth, phenomena of population interactions such as mutualism, competition, parasitism, predation, commensalism and amensalism.

Detailed description of these topics helps the students to understand the chapter in-depth. Diagrams, illustrations, figures, graphical representation and lucid language make this chapter comprehensive and easy to learn. Sequential progress of topics helps to grasp and retain better. A combination of 4 chapters, this unit holds a total weightage of 14 marks in Grade 12 final examination. The topics and sub-topics in Chapter 13 Organisms and Populations are given below.

We cover all exercises in the chapter given below Other than given exercises, you should also practice all the solved examples given in the book to clear your concepts on Organisms and Populations. Download the free PDF of Chapter 13 Organisms and Populations and take the print out to keep it handy for your exam preparation.Please upload cell structure and functions ppt as soon as possible I am so glad to have found your site with these powerpoint presentations. Ratnakumar Thanks a million.

Kindly upload the Botany portions of the first year too. It is very useful. This is masterpiece. I dont have words to admire. You must have taken lots of pains to create these powerpoint presentations.

biology ppt for class 12

I go through ur ppt sir its very useful for the students who is willing to go to medical professional. Great work sir Sir please upload the morphology of flowering plants and anatomy of flowering plant. Eagerly waiting. Great Work Sir. Sir Please upload Transport in Plants and Photosynthesis.

Ppt Presentations. Biology PowerPoint Presentations. Email This BlogThis! Unknown January 1, at AM. Unknown April 5, at AM. Unknown April 6, at AM. Unknown June 19, at AM. Unknown July 19, at PM. Unknown August 2, at PM. Unknown October 27, at AM. Unknown November 13, at AM. Unknown December 15, at AM.

Anonymous February 19, at AM. Unknown March 13, at AM. Unknown May 27, at AM. Unknown July 15, at PM. Unknown October 7, at AM. MM October 24, at AM. Unknown November 14, at AM. Unknown December 16, at PM. Unknown March 31, at AM. Unknown July 2, at PM. July 17, at AM.Download revision notes for Reproduction in Organisms class 12 Notes and score high in exams.

These are the Reproduction in Organisms class 12 Notes Biology prepared by team of expert teachers. The revision notes help you revise the whole chapter 1 in minutes. Revision notes in exam days is one of the best tips recommended by teachers during exam days. Reproduction is a biological process of formation of new offsprings from the pre-existing organism. Reproduction becomes a vital process without which species cannot survive for long It ensures continuity of species generation after generations as older individuals undergo senescence and ultimately they die.

Life span of organisms varies from few days Butterfly-1to 2 weeks to thousands of years Banyan tree. Types of Reproduction : Based on whether there is one or two organisms taking part in the process of reproduction.

When the offspring is produced by single parents with or without the involvement of gamete formation, the reproduction is called asexual reproduction. When two parents opposite sex participates in reproduction process and also involves the fusion of male and female gametes, it is called sexual reproduction.

Thus, in these organisms cell division is the mode of reproduction itself. Ex- amoeba, paramecium. Asexual reproduction is the most common method of reproduction in organisms having simpler body like in algae and fungi but during unfavorable condition they shift to sexual reproduction.

Juvenile phase — The period between birth and sexual maturity is called juvenile phase. In plants it is known as vegetative phase. Some other plants like bamboo species flowers once in life time after yearsStrobilanthus kunthiana neelakuranji ,flowers once in 12 years.

CBSE Class 12 Biology -- Evolution -- Full Chapter -- By Shiksha House

The broken endometrium is passed out during menstruation. The broken endometrium is reabsorbed. Interaction between hormones and environmental factors regulate the reproductive processes. Pre-fertilisation — all the events prior to fusion of gametes are included in it. It includes gametogenesis and gamete transfer.

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Gametogenesis is the process of formation of male and female gametes. Gametes are haploid cells which may be similar or dissimilar in structure. In algae, both gametes are similar in structure called homogametes isogametes.

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In higher organism that reproduces sexually, two morphologically distinct gametes are formed called heterogametesmale gametes are called antherozoid or sperm and female gametes are called ovum or egg. In fungi and plants, homothallic and monoecious terms are used to denote the bisexual condition and heterothallic and dioecious are used for unisexual condition. In flowering plants, the unisexual male flower is staminatei. Diploid organisms form gametes by meiotic division.

The organisms belonging to algae, fungi, and bryophytes have haploid plant body and pteridophytes, gymnosperms, angiosperms and most of animals are diploid having double set of chromosome.

Biology Class 12 PPT

Gamete Transfer — in majority of organisms, male gametes are motile and females gametes are non-motile, except in fungi and algae in which both gametes are motile. The number of male gametes are much more than number of female gametes as most of male gametes fail to reach the female gametes. Pollen grains must be transferred from anther to stigma to facilitate fertilisation. The transfer of pollen grains from anther to stigma is called pollination.

Pollination may be self anther to stigma of same flower or cross anther to stigma of different flower. Fertilisation — The fusion of male and female gamete is called fertilization or syngamy. It results in the formation of diploid zygote.Nice Website Hey JOIN now fblikesbot.

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Unknown 10 August at DMM Jhon 10 August at Gautam 9 November at Unknown 17 January at Unknown 13 February at Unknown 16 February at Unknown 23 February at Unknown 18 March at CBSE Class 12 Biology Chapter-wise Notes presented by Vidyakul offer students with the summary of the chapters, important points to remember, detailed explanation of important concepts and illustrations for better comprehension and retaining of the chapter content.

Prepared by our panel of experienced teachers, these chapter-wise notes ease out the preparation and revision process of the students for the board examinations. Thus, these Chapter-wise Class 12 Biology notes are prepared strictly according to the NCERT Syllabus to ensure maximum preparation and good marks in the board examination.

Class 12 Biology is one of the tough subjects that a student faces for his board exams. With vast course content, students find it difficult to manage it. Thus, they need to put continuous efforts and rigorous practice are required by the students to score maximum marks in the board examinations. These CBSE Class 12 Biology Chapter-wise Notes are prepared by our panel of highly experienced teachers after analyzing the past 10 years of examination papers and material so no important concept is left behind.

This utmost precision in preparing these notes for students ultimately leads to maximum marks in the board examination. Vidyakul understands the difficulties faced by the students in Class 12 while facing Biology, thus, we bring them a solution to lower down the pressure and increase their self-confidence. Forgot Password? OTP has been sent to you on your mobile number. Please enter below. Didn't receive OTP? Resend OTP. Want to update details? Please provide the Phone Number you used when you signed up for your Vidyakul account.

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biology ppt for class 12

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