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CBSE Class VIII (8th) - Science Chapter 3. SYNTHETIC FIBRES AND PLASTICS
As handle require strength and stiffness so it should be made from plastic. They are also made from a type of thermosetting plastics, called Bakelite. Its like you learn my mind! Unit 4 Correlation of Home Science with other subjects. Competencies associated with laboratory techniques. The world's largest nuclear glossary.

Mode of nutrition in plants

Nutrition in Plants

Usually portions of the cell flow around the material, enclosing it within a chamber. When the engulfed material is liquid or consists of very small particles, the process is often termed pinocytosis. Cell Biology Links - Click on the links below for detailed information. Everything you need to know about Protonema.

Moss gametophytes and sporophytes Moss capsule Moss antheridia Moss archegonia Marchantia thallus Marchantia archegonia Marchantia antheridia.

Ligustrum Leaf Cross Section. Evergreen ligustrum often called privet shrubs and trees thrive throughout the state of Florida. They are widely used as landscape shrubs, hedges, and specimen trees. Many species and cultivars are available with a diversity of leaf colors, leaf forms, and growth habits. All selections are tolerant of heavy pruning, which makes them suited for clipped hedges. Because of a rapid growth rate, many require pruning to maintain them within bounds. The white flowers are attractive during late spring and early summer.

However, the pungent odor may be objectionable. The nucleus plays the central role in cellular reproduction, the process whereby a single cell undergoes cell division and forms two new cells. The nucleus directs the metabolic activities of the living cell and guides the life of the cell as long as it lives. They are composed of nucleic acid and protein. The chromosomes bear, apparently in linear arrangement, the basic units of heredity, called genes. They are the code units of the transmission of bits of information from parent to offspring, and for the determination of the enzymes that so precisely regulate the myriad interdependent chemical reactions of life.

Genes and Chromosomes - Biology: DNA in a Nutshell! DNA - From the Beginning. Primer on Molecular Genetics from the U. Up to 3 fragments may be cloned at a time can you replicate that in the lab?

Each fragment may be inverted relative to its original orientation. Genetic elements contained in the cloned fragments are transferred to the cloned DNA. We found an excellent Genetics tutorial: You will have to register to view it but it is free. A virus can multiply only inside a host cell, whose genetic mechanisms it subverts for its own reproduction. Both the structure of the virus and its mode of replication differ widely between viruses.

The usual outcome of a viral infection is the lysis destruction of the infected cell, with the release of viral particles. Some viruses, however, can instead become integrated into the host chromosome, where their genes are replicated along with those of the host cell. Because viruses sometimes carry host DNA sequences from one species to another, they make possible an occasional mixing of different gene pools during their evolution.

Virulent viruses usually kill the cells they infect. Other viruses, although also often able to kill cells, frequently have a more subtle effect.

These viruses are called temperate. Virus infected bacteria which appear un-infected but have the hereditary ability to produce phage, are called lysogenic. Upon infection, genes promoting both lytic growth and lysogenic integration are expressed. Which pathway succeeds is determined by the competing action of these early gene products and by the influence of host factors.

The lambda phage is a well studied temperate phage which can grow in synchrony with its host E. The lytic cycle is that part of the life cycle of a temperate phage in which it multiplies rapidly, destroying its host and releasing many copies into the medium. The pathway genes in the lambda immunity region are: The lambda system provides one of the best studied examples of a genetic switch. Two back-to-back promoters in the region of cI and cro control the genetic switch.

When cI is present it activates its own synthesis and blocks transcription of cro. When cI is inactivated, transcription of cro can occur, resulting in the lytic cycle.

The cI protein combines with the operator, Or. Polymerase are enzymes producing a polynucleotide sequence, complementary to a pre-existing template polynucleotide. Polymerization is the combination of several molecules to form a more complex molecule, usually by addition or a condensation process. It is sometimes a reversible process.

Biology I Reference Sites. Gram Negative Stain - Red or pinkish. Why does it stain this way? The color differences are sometimes subtle so learn to recognize the differences! When, as the result of my first communications on the fermentations in , it appeared that the ferments, properly so-called, are living beings, that the germs of microscopic organisms abound in the surface of all objects, in th air and in water; that the theory of spontaneous generation is chimerical; Book Directory Computational Molecular Biology: An Integration of Chemistry Click on the names in the List below for detailed information.

It is known for its nitrogen fixing abilities, and they form symbiotic relationships with certain plants, such as the mosquito fern. They are one of four genera of cyanobacteria that produce neurotoxins , which are harmful to local wildlife, as well as farm animals and pets. Joint-Legs Phylum Arthropoda M Those That Sting - Visit the Oregon Coast Aquarium's virtual jellyfish exhibit to learn about the jellyfish's biology, life cycle, relatives and even see live pictures on the JellyCam.

Also has two classroom activities, one K-4 and the other Introduction to the Ctenophora - Information on ctenophores "comb jellies" with links to cnidarian and jellyfish information. Invasion of the jellyfish.

Sea Stars - Information on its description, habitat, diet, breeding, etc. Confocal Image Gallery - Marchantia Sporophyte. Deuterostomia - Lophotrochozoans vs. Metabolic Pathways Wall Chart. You can access the individual images by clicking in a reduced image of an entire section of the wall chart use the linkS below. Stem Cells; Scientific Progress and A Global Resource Scientific American: Science and the Citizen: If you enjoy caring for people and are intrigued by a job where you will constantly learn and interact with people, than learn more about online medical assisting degrees.

As a medical assistant, you will work closely with a physician and perform clinical tasks as well as work on administrative tasks. Human Anatomy Online - InnerBody. What is zoology anyway? The study of animals. The branch of biology that studies and classifies animals and animal life.

It is a branch of biology that is concerned with the scientific study of animals, including their biology, distribution, and identification and including the study of animals - mammals, birds, reptiles, amphibians, fish, insects, spiders, and mollusks including mussels. The science and history of the animal kingdom, including its king, the House Fly Musca maledicta.

The father of Zoology was Aristotle, as is universally conceded, but the name of its mother has not come down to us. Two of the science's most illustrious expounders were Buffon and Oliver Goldsmith, from both of whom we learn L'Histoire generale des animaux and A History of Animated Nature that the domestic cow sheds its horn every two years. OK, OK enough of the definitions - now tell me some zoology details. I want details please. Animals - Animal Kingdom Sites. University of Michigan - Zoology BiologyBrowser.

General animal kingdom sites: Since the [natural] history of man interests us most directly and should stand as the basis of comparison to which we submit the accounts of all other animals, we shall treat it in greater detail. Amphibians Loads of information on amphibians. Includes a tutorial on amphibian embryonic development, amphibian pictures and more. Birds Information on bird identification, bird songs, pictures, clipart and more. Bird Behavior Information on speech, mating habits, migration and other behavioral characteristics exhibited by birds.

Animals Discover some interesting facts about animals. Mammals Learn about the characteristics that differentiate mammals from other vertebrates. Primates Information and resources pertaining to primates. Includes images of different primate species.

Reptiles Learn about turtles, lizards, snakes and other reptiles. Includes wonderful images of various reptiles. Rana should buy a cotton shirt made for summer. Where as shirt made from cotton will soak the perspiration very rapidly and transfer it to outside, for surface vaporization, this will give him cooling comfort. Give examples to show that plastics are noncorrosive in nature. That is why they are used to store.

Should the handle and bristles of a tooth brush be made of the same material? The handle and bristles of a tooth brush should not be made of the same material. As handle require strength and stiffness so it should be made from plastic. Where as bristles are soft and elastic so they should be made from nylon. Comment on this advice. Plastic is non-biodegradable product. Plastic takes several years to decompose, it is not environment friendly.

It causes environmental pollution. Besides, the burning process in the synthetic material is quite slow and it does not get completely burnt easily. In the process it releases lots of poisonous fumes into the atmosphere causing air pollution.

We should avoid the use of plastics as far as possible. We should make use of bags made of cotton or jute when you go for shopping. In our homes, offices and industries, the biodegradable and non-biodegradable wastes should be collected separately and disposed off separately.

Match the terms of column I correctly with the phrases given in column II. Manufacturing synthetic fibres is actually helping conservation of forests as. Describe an activity to show that thermoplastic is a poor conductor of electricity. Posted by Jagdish Singh at Topper Learning 13 July at Buros Institute of Mental Measurements. Pentice Hall of India Pvt. Holt, Rinehart and Winston.

John Wiley and Sons Inc. Nature, purpose and need for guidance and counselling principles and types of guidance and counselling characteristics of an effective counsellor.

Group Guidance - Concept, need, significance and principles. Organisation of group-guidance activities. Standardized and non-standardized techniques and their relative use in collecting information, organization of guidance programmes in schools. Collection, types, classification and dissemination of information. Concept, importance and process of career development various theories related to career development; career patterns; career maturity, and vocational career.

Behaviour problems of students with special needs, viz. Provision of facilities at governmental and non-governmental level. Crow and Crow , Introduction to Guidance, 2 nd Ed. Jayaswal, Monica , Guidance and Counselling, Lucknow: Concept and meaning of special education its aims, aims of Special Education - Educational provisions, recommendations of Education NPE with regard to special education special schools, integrated education for disabled children.

Definition of blindness and low vision. Curriculum and teaching adaptation. Class room management, vocational preparation ,and employment opportunities. Definition of deafness and partial hearing. Tools and techniques, class room management, vocational preparation ,and employment opportunities.

Definition of mental retardation. Class room management, vocational preparation, and employment opportunities. Definition of orthopaedic handicap. Adaptive devices, adaptive evaluation procedures, tools and techniques.

Classroom management, vocational preparation and employment opportunities. To enable the student — teacher to: Federation of Management of Educational Institutions. Lal Book Depot Hindi. Indian culture and human values spiritual values. Unit 3 Moral Learning to Moral Education. Nature of society and moral learning. Media and moral learning. Newman, Fred , Education for Citizen Action: To enable the student teacher understand about the concept of environmental education. To develop in the student teacher a sense of awareness about the environmental pollution, and possible hazards and its causes and remedies.

To develop reasonable understanding about the role of school and education in fostering the idea of learning to live in harmony with nature. To enable the students to understand about the various measures available to conserve the environment for sustaining the development.

Conservation of genetic diversity. An important environment priority: To enable the students to understand various terminology connected with population studies and factors responsible for population growth. To develop an awareness in the student teacher of the implications of population growth on various aspects of social functioning. To help student teacher to understand the effect of unchecked growth of population on the depletion of natural resources from the environment. To help student teacher to appreciate the role of population education as an educational intervention for upgrading the quality of social functioning.

Nature and scope of population education: Age, sex, rural, urban, literacy — all India. Population in relation to: Scope of population education in schools. Inquiry approach, observation, self-study, discussions, assignments. Newspapers, Radio, Television, A. Teacher role in creating awareness of the consequences of population problems, inculcating new values and attitudes leading to modification of student behaviour. To acquaint the student teachers with the concept and concerns of educational administration.

To develop an understanding of the role of the headmaster and the teacher in school management. To enable the students to understand to concept at importance of communication and its possible barriers in educational administration. To enable the student teacher to critically analyse the administrative scenario in relation to the functioning of the other secondary schools of the area.

To acquaint the student teacher with the scientific practices of educational management and keep him to apply it in work situation. Concept of educational administration. Basic functions of administration — planning, organizing directing and controlling. Role of communication in effective management and administration. Role of headmaster in planning of school activities, approaches to management — manpower approach, cost benefit approach, social demand approach, social justice approach.

The administrative structure in the field of education in the state. All the students will undergo full time intensive School experience programme for thirty working days between November and January as per the convenience of respective Practice Schools.

External evaluation will be done by a Board of Examiners comprising of an Internal and an External examiner appointed by the University on the basis of relevant records such as lesson plans, teaching aids, used during the practice teaching, observation record, school profile etc. In case of assignments one shall be related to theory and record shall relate to the field investigation. Create a digital Unit Plan portfolio with the following elements: Component I shall be evaluated by the Internal Faculty.

The students will be evaluated for component IV on the basis of the digital portfolio they create. Each record shall carry equal marks: Visual Education — Charts, Three dimensional model, college magazine or scrap — book.

The Viva — Voce will conducted on the basis of records generated under the above heads of activities and all the five activities.

Experience in a School based activity which the student-teacher could handle as a SUPW activity for students. End product to be submitted for evaluation by external examiners. Cost effective teaching aids. Setting up mathematics laboratory. At least any two of the above activities to be offered by each student.

Participation in college, University activities. Conceptualizing, conducting and reporting of two different kinds of events organised for School students during internship period. Attachment with NGOs or social agency preparation of report. The importance of providing special language course at the higher secondary level; language courses for science, medicine, engineering, journalism, law and literature, etc.

Place and objective of literature in a school course in English with special reference to the higher secondary level. Methods and materials for developing study skill in English literary-forms: Use of cultural context and dictionary and other relevant sources for better comprehensions; discussion and self study. Development of appreciation, skills of comprehension in relation to art of interpretation and the ways of developing the latter; development of judgement and evaluation of literary writing; relative importance of classics and popular literature in English.

Developing wider reading interests. Procuring and using suitable library materials. Arranging displays of new books, book lists, book reviews and journals suitable for the pupils, organising other literary activities like discussion on various books read. Developing writing skills, exercise in current writing-grammar exercises, synthesis and transformation of sentences, paragraph writing, precis writing, note taking and reporting adapting and reviewing.

Exercises in creative writing, free composition writing, letter writing, essay and dialogue writing, dramatic writing; diary entries and poems. Developing advanced oral skills. Exercises in reading with expression, literary texts of suitable poems, plays and stories. Use of suitable audio-materials, recorded reading of literary text of various types, broadcasts and T. Use of language laboratories.

Planning lessons in Prose, Poetry, Drama, Novel, etc. Different techniques for detailed and not-detailed study, preparatory work, actual study and following up in various useful ways. Poetry and Drama presented orally; place and use of discussion and interpretation methods, rather than explanation; focussing on a Emotion and imagery in poetry lessons; b Character and incident in Drama and Novels c Idea and argument in essays.

Evaluating achievements in English at the advanced level, using objective, short answer type and essay tests judiciously criteria for marking creative writings, methods of evaluating interest and extent in wider reading. Planning teachings of English at the Higher Secondary level; Allocation of adequate total time, proper provisioning in the time-table for various skills. Procurement of suitable books and other material for the School and Class Libraries and facility for pupils to use Audio-Visual Aids T.

Planning session, annual and occasional tests and their weightage in the final assessment. Professional growth and leadership in the field. Objectives of Teaching Physics. Centre of mass, rigid body, rotational motion, gravitation, heat and thermodynamics, solid and semiconductor devices, wave optics, wave and particles nature of light. Co-curricular Activities in Physics. K and Shjarma S. Deep and Deep Publications Pvt. The teaching of chemistry at senior secondary level focuses on the disciplinary approach as compared to the integrated approach to teaching of science being adopted till secondary level.

Hence, the student-teachers are to be pedagogically oriented to chemistry as a disciplines. The correlation of micro-level behaviour in terms of atoms and molecules with the macro-level observation phenomena along with the symbolic representations through equations has to be made with appropriate teaching learning experiences. The significance of project work at plus two level and development of laboratory working skills needs special emphasis.

Chemistry as a discipline, its nature and scope. Objectives of teaching-cognitive, affective and psychomotor domain, broad principles of teaching at plus two level. Pedagogical analysis of content at plus two level for functional understanding of concepts, laws and theories and correlating them to pedagogical principles. Principles for curriculum construction. A brief review of development of curriculum projects in chemistry such as CHEM study project, Nuffield project in chemistry and Chemical Bend Approach project.

Preparation of unit plans and lesson plans based on: Instructional aids for senior secondary level-need, uses and kinds. Preparation of OHP transparencies, making of improvised apparatus, molecular models etc.

Use of computers in teaching of chemistry, multi-media approach and internet browsing technique. Organization of science clubs, science exhibitions and field trips. Identifying the testing situations to evaluate learning outcomes in correlation with the objectives of teaching chemistry at plus two level.

CBSE Textbook Exercises Solutions