Extra Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation Q.1. Define biodiversity.Ans. The occurrence of different types of genes, gene pools, species, habitats and ecosystems in a particular place and various parts of earth is called biodiversity. Q.2. What is mass extinction?Ans. Due to natural calamities like volcanic eruptions, prolonged drought, heavy rains, … Read more
Extra Questions for Class 12 Biology Chapter 14 Ecosystem Q.1. What is detritus?Ans. Dead organic matter or remains of plant such as leaves, bark, flower and dead remain of animals, including faecal matter constitute detritus. Q.2. Why is the rate of assimilation of energy at the herbivore level called secondary productivity?Ans. It is because the … Read more
Extra Questions for Class 12 Biology Chapter 13 Organisms and Populations Q.1. Name the interaction between sea anemone and the hermit crab that grows on it.Ans. Commensalism Q.2. Why are green algae not likely to be found in the deepest strata of the ocean?Ans. The wavelength of light at the deepest strata is unsuitable for … Read more
Extra Questions for Class 12 Biology Chapter 12 Biotechnology and its Applications Here we are providing extra questions for class 12 biology. This post covers extra questions for class 12 biology chapter 12 Biotechnology and its Applications. Students can read and practice these questions to score better marks in the exam. Q.1. Why is the … Read more
Extra Questions for Class 12 Biology Chapter 11 Biotechnology Principles and Processes Q.1. Mention the uses of cloning vector in biotechnology. Ans. Cloning vectors are used for transferring fragments of foreign DNA into a suitable host. They are also used to select recombinants from non-recombinants. Q.2. Identify the reason for selection of DNA polymerase from … Read more
Extra Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare Q.1. Name the pests that ladybird, beetle and dragonflies help to get rid of.Ans. Ladybird, beetle and dragonflies control aphids and mosquitoes respectively. Q.2. Why is distillation required for producing certain alcoholic drinks?Ans. Distillation increases the alcohol content in alcoholic drinks. Q.3. What … Read more
Extra Questions for Class 12 Biology Chapter 9 Strategies for Enhancement in Food Production Q.1. A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem. Ans. Inbreeding depression or continuous inbreeding may be the reason of reduced fertility and productivity. To overcome this, the cattle … Read more
Extra Questions for Class 12 Biology Chapter 8 Human Health and Diseases Q.1. Why is Gambusia introduced into drains and ponds?Ans. To feed on mosquito larvae so as to eliminate the vectors responsible for causing malaria. Q.2. Name any two physiological barriers that provide innate immunity? Ans. Acid in stomach/saliva in mouth/tears in eyes. (Any … Read more
Extra Questions for Class 12 Biology Chapter 7 Evolution Q.1. What is fossil?Ans. Fossils are the remains or impressions of ancient organisms preserved in sedimentary rocks or other media. Q.2. Life originated from earth’s inorganic atmosphere in past but not today. Suggest two reason.Ans. (i) Presence of free oxygen in present day atmosphere.(ii) Very high … Read more
Extra Questions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation Q.1. A garden pea plant produced axial white flowers. Another of the same species produced terminal violet flowers. Identify the dominant traits.Ans. Axial, violet flower. Q.2. When a tall pea plant was self-pollinated, one-fourth of the progeny were dwarf. Give the genotype … Read more
Extra Questions for Class 12 Biology Chapter 4 Reproductive Health Here we are providing extra questions for class 12 biology. Here you will find extra questions for chapter 4 reproductive health. Students can read and practice these questions to score better marks in the exam. Q.1. A doctor has observed the chromosomal disorders in developing … Read more
Extra Questions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Here we are providing extra questions for class 12 biology. this post covers extra question for Chapter 2 Sexual Reproduction in Flowering Plants. Students can read and practice these questions to score better marks in the exam. Q.1. State the function of … Read more
MCQ Questions for Class 12 Biology Chapter 7 Evolution Q.1. According to Hugo de Vries, speciation is due to(a) accumulation of small variations (b) intraspecific breeding(c) inter specific breeding (d) saltation Answer Answer: (d) Q.2. The most accepted line of descent in human evolution is (a) Australopithecus → Ramapithecus → Homo sapiens → Homo habilis(b) … Read more
MCQ Questions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance Q.1. Gene controls(a) protein synthesis but not heredity(b) protein synthesis and heredity(c) heredity but not protein synthesis(d) biochemical reaction of some enzymes Answer Answer: (b) Q.2. With regard to mature mRNA in eukaryotes(a) exons and introns do not appear in the mature RNA(b) … Read more
MCQ Questions for Class 12 Biology Chapter 1 Reproduction in Organisms Q.1. The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because(a) offspring do not possess exact copies of parental DNA(b) DNA of only one parent is copied and passed on to the offspring(c) offspring are formed at different times(d) DNA of … Read more
Extra Questions for Class 12 Biology Chapter 3 Human Reproduction Q.1. Name the important mammary gland secretions that help in resistance of the new born baby.Ans. Colostrum Q.2. Males in whom testes fail to descend to the scrotum are generally infertile. Why?Ans. If the testes fail to descend to the scrotum, gametogenesis could be inhibited. … Read more
Extra Questions for Class 12 Biology Chapter 1 Reproduction in Organisms Q.1. Is Marchantia monoecious or dioecious? Where are the sex organs borne in this plant? Ans. Marchantia is dioecious. The male sex organs, antheridia, are borne on the antheridiophores and female sex organs, called as archegonia are borne on archegoniophores. Q.2. Meiosis is an … Read more
MCQ Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation Here we are providing mcq questions for class 12 biology chapter 15 biodiversity and conservation. These questions on biodiversity and conservation is prepared by subject expert. Students can practice these questions to score better marks in their exams. Q.1. The variation shown by the … Read more
MCQ Questions for Class 12 Biology Chapter 14 Ecosystem Here we are providing mcq questions for class 12 biology chapter 14 ecosystem. These questions are prepared by subject expert and are based on latest syllabus prescribed by board. Students can practice these questions to score better marks in their exams. Q.1. Hydrosphere is composed of … Read more
MCQ Questions for Class 12 Biology Chapter 13 Organisms and Populations Here we are providing MCQ questions for Class 12 Biology Chapter 13 Organisms and Populations. These questions are prepared by subject expert and is according to the latest pattern prescribed by CBSE board. Students can practice these questions to score better marks in the … Read more
MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare Here we are providing MCQ questions for Class 12 Biology chapter 10 Microbes in human welfare. These questions are prepared by subject experts and is according to the latest syllabus. Students can practice these questions to score better marks in their exams. To … Read more
Strategies for Enhancement in Food Production Here we are providing MCQ questions for class 12 biology chapter 9 Strategies for enhancement in food production. These questions are based on NCERT and prepared by subject experts. Students can practice these questions to score better in the exam. Q.1. Domestication of silk worm is called(A) Sericulture (B) … Read more
MCQ Questions for Class 12 Biology Chapter 8 Human Health and Diseases Q.1. Who is called the father of surgery?(A) Hippocrates (B) Susruta(C) Charaka (D) Robert Koch Answer Answer: B Q.2. Epidemiology is more helpful in(A) Non-communicable disease (B) Communicable disease(C) Selective mating population (D) Random mating population. Answer Answer: B Q.3. Health is(A) Wealth(B) … Read more
MCQ Questions for Class 12 Biology Chapter 5 Principle of inheritance and variation Q.1. Test cross involves (a) crossing between two genotypes with dominant trait (b) crossing between two genotypes with recessive trait (c) crossing between two F1 hybrids (d) crossing the F1 hybrid with a double recessive genotype. Answer Answer: (d) Q.2. In Mendel’s … Read more
Q.1. Tubectomy is a method of sterilization in which(a) nucleus is removed (b) ovaries are removed(c) small part of fallopian tube is removed (d) small part of vast deferens is removed Answer Answer: (c) Q.2. Following statements are given regarding MTP. (i) MTPs are generally advised during first trimester(ii) MTPs are used as a contraceptive … Read more
Q.1. The correct sequence of stages in spermatogenesis are:(a) spermatogonia → spermatid → spermatocyte → sperm(b) spermatocyte → spermatogonia → spermatid → sperm(c) spermatogonia → spermatocyte → spermatid → sperm(d) spermatid → spermatocyte → spermatogonia → sperm Answer Answer: (c) Q.2. The signals of parturition originate from(a) placenta (b) fully developed foetus(c) oxytocin released from … Read more
MCQ Questions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Q.1. A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is(a) plant is dioecious and bears only pistillate flowers(b) plant is dioecious and bears both pistillate and staminate flowers(c) plant is monoecious(d) … Read more
