XII 1 MARKS QUESTIONS
1. What is a pair of contrasting character known as?
2. What is the external appearance of an individual for a particular contrasting character is called?
3. Name the persons who rediscovered Mendel's Law.
4. On the Basis of which cross Mendel formulated the law of purity of gametes?
5. What is the ratio of pure tall to pure dwarf in F2generation if a pure tall plant is crossed with a dwarf plant
6. What is the genotype of a dwarf, round seeded pea plant?
7. Which method is used to determine the probable customer for a cross?
8. What are the genes known as which are located on same locus but show more than two different phenotypes?
9. Give an example of polygenic inheritance in human beings
10. Who noted polygenic inheritance in skin colour for the first time?
11. How many types of gametes is formed by AABbCc genotype.
12. If a Child has Blood group 'O' then his parents will not have which blood group?
13. What is the other name for checker board and after whom is it named?
14. What is a Reciprocal Cross?
15. How many phenotypes and Genotypes of blood groups Present in human population?
16. Name the two types of gene interactions
17. Name the population derived from marriages between.
18. Name the type of inheritance in which genotype ratio is the same as the phenotypic ratio
19. State Mendel's third law of inheritance.
20. What does the symbols F1 and F2 stand for?
21. What is meant by the term alleles?
HUMAN HEALTH AND DISEASE
SECTION- A (1 mark each)
1. Name the diagnostic test which confirms typhoid
2. Name the two major groups of cells required to attain specific immunity.
3. You have heard of many incidences of amoebiosis in our country. Name the vector of the disease.
4. Breast fed babies are more immune to diseases than the bottle fed babies. Why?
5. Name the pathogen which causes malignant malaria.
6. Which microorganism is used to produce hepatitis B Vaccine?
7. What is the reason of shivering in malarial patient?
SECTION B (2 MARKS)
8. Where are B-cells and T-cells formed? How do they differ from each other?
9. Given below are the pathogens and the diseases caused by them. Which out of these pairs is not correct matching pair and why?
(a) Wuchereria – Filariasis
(b) Microsporum – Ringworm
(c) Salmonella – Common Cold
(d) Plasmodium – Malaria
10. What would happen to the immune system, if thymus gland is removed from the body of a person?
11. Lymph nodes are secondary lymphoid organs. Describe the role of lymph nodes in our immune response.
12. What is the role of histamine in inflammatory response?
Section C (3 Mark each)
13. What are Cannabinoids? From which plant Cannabinoids are obtained?. Which part of the body is affected by consuming these substances?
14. Draw well labeled structure of an antibody molecule Give the answer of the following questions.
(i) Which cells produce these chemicals?
(ii) State the function of these molecules. Draw well labeled structure of an antibody molecule
15. Mention any three causes of drug abuse. Suggest some measures for the prevention and control of drug abuse.
16. A person shows unwelcome immunogenic reactions while exposed to certain substances.
(a) Name this condition.
(b) What common term is given to the substances responsible for this condition?
(c) Name the cells and the chemical substances released which cause such reactions
Section D ( 5mark each)
17. Answer the following with respect to Caner.
(a) How does a cancerous cell differ from a normal cell?
(b) Benign tumor is less dangerous than malignant tumor. Why ?
(c) Describe causes of cancer.
(d) Mention two methods of treatment of the disease.
18. The pathogen of a disease depends on RBCs of human for growth and reproduction. The person with this pathogen suffers with chill and high fever.
(a) Identify the disease.
(b) Name the pathogen.
(c) What is the cause of fever?
(d) Represent the life cycle of the pathogen diagrammatically.
19. The immune system of a person is suppressed. He was found positive for a pathogen in the diagnostic test ELISA.
(a) Name the disease, the patient is suffering from.
(b) Which pathogen is identified by ELISA test?
(c) Which cells of the body are attacked by the pathogen?
(d) Suggest preventive measure of the infection.
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