CBSE Class 12 Biology Strategies For Enhancement In Food Production Worksheet Set C

MULTIPLE CHOICE QUESTIONS Question. Azolla is used as a biofertilizer because it (a) multiplies very fast to produce massive biomass (b) has association of nitrogen-fixing Rhizobium (c) has association of nitrogen-fixing Cyanobacteria (d) has association of mycorrhiza Answer…

CBSE Class 12 Biology Sexual Reproduction in Flowering Plants Worksheet Set A

Multiple Choice Questions (MCQs) Question. The anther contains : (a) sepals (b) ovules (c) carpel (d) pollen grains Answer : D Question. Which of the following method of contraception protects a person from acquiring a sexually transmitted disease ? (a) oral pills (b)…

CBSE Class 12 Biology Reproductive Health Worksheet Set G

               Very Short Answer Q1)       Why there is the statutory ban on the amniocentesis? Q2)       Define reproductive health? Q3)       When were the programmes of the family planning initiated? Q4)       What are sexually transmitted diseases? Q5)       What is…

CBSE Class 12 Biology Reproduction in Organisms Worksheet Set A

Very Short Answer Question. What is clone? Answer. Clone is used to describe such morphologically and genetically similar individuals. Question. In organisms what is the mode of reproduction? Answer. In organisms cell division itself a mode of reproduction.…

CBSE Class 12 Biology Principles of Inheritance and Variation Worksheet Set C

             Very Short Answer Q1)       Define mutation? Q2)       What is pleiotropic gene? Q3)       What are alleles? Q4)       Which is not an autonomous feature of a gene? Q5)       What are genes?                             Short Answer Q6)       Define polygenic…

CBSE Class 12 Biology Principles of Inheritance and Variation Worksheet Set D

             Very Short Answer Q1)       Who conducted the hybridisation experiments on garden peas? Q2)       Define inheritance? Q3)       What is genetics? Q4)       Who study the effect of hard x-rays on bacteriophage multiplication? Q5)       What is variation…

CBSE Class 12 Biology Organisms And Population Worksheet Set C

Very Short Answers Type Questions Question. Species that can tolerate narrow range of temperature are called...... Answer : Stenothermal Organisms Temperature, a major abiotic factor affects the metabolism, activity and so many other physiological functions of the organism. On…

CBSE Class 12 Biology Molecular Basis of Inheritance Worksheet Set C

MULTIPLE CHOICE QUESTIONS Question. Balbiani rings are found in (a) polysomes (b) polytene chromosomes (c) autosomes (d) nonsense chromosomes Answer. B Question. In DNA helix, cytosine is paired with guanine by  (a) covalent bond (b) phosphate bond (c) three hydrogen…

CBSE Class 12 Biology Molecular Basis of Inheritance Worksheet Set B

MULTIPLE CHOICE QUESTIONS Question. Okazaki fragments form  (a) leading strand (b) lagging strand (c) non-sense strand (d) senseful strand Answer. B Question. During protein synthesis in an organism, at one point the process comes to a halt. Select the group of the…

CBSE Class 12 Biology Molecular Basis of Inheritance Worksheet Set A

Very Short Answer Questions Question. How many base pairs would a DNA segment of length 1.36 nm have? 0.34 ×10-6 ×1.36 4 ×106 bp Answer. Distance between two base pairs = 0.34 nm or 0.34×10–6 nm Number of base pairs in 1.36 nm DNA segment Question. How is…

CBSE Class 12 Biology Microbes In Human Welfare Worksheet Set B

Very Short Answer Question. What are the uses of microbes? Question. How the Roquefort cheeses are ripened? Question. Where microbes are present? Question. What are fermentors? Question. What are lactic acid bacteria?     …

CBSE Class 12 Biology Human Reproduction Worksheet Set G

                Very Short Answer Q1)       What are androgens? Q2)       What is scrotum? Q3)       Define urethral meatus? Q4)       How can we maintain the low temperature of the testes? Q5)       What are testicular lobules?                             Short Answer Q6…

CBSE Class 12 Biology Human Health And Diseases Worksheet Set B

  Very Short Answer Questions Question. Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes. Answer. Dengue/Chikungunya/yellow fever/Eastern equine encephalitis/West Nile fever/Zika virus disease. (Any two) Question. Name the…

CBSE Class 12 Biology Human Health And Diseases Worksheet Set A

Question. Cancer cells are more easily damaged by radiation than normal cells because they are (a) starved of mutation (b) undergoing rapid division (c) different in structure (d) non-dividing Answer : B Question. Treatment and detection of cancer can be done by (a…

CBSE Class 12 Biology Evolution Worksheet Set B

Question. How does the study of fossils support evolution? Explain. Answer. Fossils refer to the petrified remains or impressions of organisms that lived in past and got preserved in the sedimentary rocks. These include bones, teeth, shells and other hard parts of animal…