Physics 12 Magnetism and matter chapter 5 exercise 1

Q.1. Answer the following questions regarding earth’s magnetism. (a) A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field. (b) The angle of dip at a location in southern India is about 180. Would you expect a grater or lesser dip angle in Britain […]

Biology 12 Organism and Populations Chapter 13 – Exercise

Biology 12 Organism and Populations Chapter 13 – Exercise, Q 1. How is diapause different from hibernation? Ans 1. Hibernation is the phenomenon commonly depicted by ecothermal (cold-blooded) animals which escape cold by hiding them in shelters such as caves, burrows, cervices, hollow thee trunks, mud etc. revealing minimum physiological activity. This phenomenon is also […]

Biology 12 Biotechnology and Its Applications – Chapter 12 Exercise

Q 1. Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because – Bacteria are resistant to the toxin Toxin is immature Toxin is inactive Bacteria encloses toxin in a special sac. Ans 1. Toxin is inactive. Q 2. What are transgenic bacteria? Illustrate using any one example. Ans 2. […]

Biology 12 Strategies for Enhancement in Food Production Chapter 9 – Exercise

Strategies for Enhancement in Food Production Chapter 9 – Exercise Q 1. Explain in brief the role of animal husbandry in human welfare. Ans 1. Animal husbandry includes feeding, breeding and raising animals livestock whose primary purpose is to provide milk and meat. Milk is considered as the ‘most nearly perfect’ food for human consumption […]

Biology 12 Human Health and Disease Chapter 8 – Exercise

Q 1. What are the various health measures which you would suggest to safeguard us against infectious diseases? Ans 1. Preventive measures are precautionary steps taken to check the transmission of infectious diseases. Common preventive measures include education, isolation, vaccination, sanitation, and sterilization. Education: People should be educated about the communicable diseases so that they […]

chemistry 12 solid state chapter 1 – exercise 1

CHEMISTRY NCERT EXERCISES WITH ANSWERS Q – 1.1 Why are solids rigid? Ans. In a solid, the constituent particles are very closely packed. Hence, the forces of attraction among these particles are very strong. Moreover, the constituent particles in solid have fixed position and can only oscillate about their mean positions. Hence, they are rigid. […]

Biology 12 Evolution chapter 7 – Exercise

Biology 12 Evolution chapter 7 – Exercise Q 1. Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory. Ans 1. When a bacterial population encounters a particular antibiotic, those sensitive to it die. One or few bacteria having mutations which make them resistant to antibiotic, survive. Such resistant bacteria multiply quickly as […]

Biology 12 Principles of Inheritance and Variation Chapter 5

Q.1. Mention the advantages of selecting pea plant for experiment by Mendel. Ans. Mendel selected pea plant because of the following special feature : Garden peas were found to differ in certain definite and easily detectable traits. The traits of each kind of pea plant were presented in generation after generation because the plants had […]

Biology Reproductive Health Chapter 4 – Exercise

Biology Reproductive Health Chapter 4 – Exercise – NCERT Biology reproductive health exercise completed here read them carefully and these are useful for cbse 12 board exams and other competitive exams. Q.1. what do you think is the significance of reproductive health in a society. ans. Rapidly expanding human population, particularly,  in the developing countries […]

Biology Human Reproduction Chapter 3 – Exercise

Q.1 Fill in the blanks: (a) Humans reproduce …………. (asexually/sexually) (b) Humans are …………. (oviparous/viviparous/ovoviviparous) (c) Fertilization is …………. in humans (external/internal) (d) Male and female gametes are …………. (diploid/haploid) (e) Zygote is …………. (diploid/haploid) (f) The process of release of ovum from mature follicle is called …………. (g) Ovulation is induced by a hormone […]

Biology Molecular Basis of Inheritance Chapter 6 – Exercise

Q.1 Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. Ans. Nitrogenous bases: Adenine, Thymine, Uracil, Cytosine Nucleosides: Cytidine, Guanosine Q.2 If a double stranded DNA has 20% of cytosines, calculate the percent of adenine in the DNA. Ans. In a DNA molecule, the number of cytosine molecules is equal to […]

Biology Reproduction in Organisms Chapter 1 – Exercise

Q-1  Why is reproduction essential for organisms? Ans. Reproduction is essential for organisms because the continuity of the species generation after generation. Q-2 Which is a better mode of reproduction sexual or asexual ? Why ? Ans. Sexual reproduction is a better mode of reproduction because is needs meiosis and fusion of male and female […]

Biology Sexual Reproduction in Flowering Plants Chapter 2 – Exercise

Biology Sexual Reproduction in Flowering Plants Chapter 2 – Exercise : NCERT solutions of Biology chapter 2 exercises. We mentioned all important questions below check them, Or you can just directly download question paper. But you will get solutions in this page only. So you can book mark this page and you will find it easily. […]