Class 12 Biology NCERT Solutions from Chapter Health and Diseases

226 Antibodies present in colostrum which protect the new born from certain diseases is of

[1] Ig G type

[2] Ig E type

[3] Ig D type

[4] Ig A type

Answer: Ig A type

227 When an apparently healthy person is diagnosed as unhealthy by a psychiatrist, the reason could be that:

[1] the patient was not efficient at his work

[2] the patient was not economically prosperous

[3] the patient shows behavioural and social maladjustment

[4] he does not take interest in sports

Answer: the patient shows behavioural and social maladjustment

228 The sporozoites that cause infection when a female Anopheles mosquito bites a human being are formed in:

[1] Liver of human

[2] RBCs of mosquito

[3] salivary glands of mosquito

[4] intestine of human

Answer: salivary glands of mosquito

229 The organisms which cause diseases in plants and animals are called:

[1] Pathogens

[2] Vectors

[3] Insects

[4] Worms

Answer: Pathogens

230 Many diseases can be diagnosed by observing the symptoms in the patient. Which group of symptoms are indicative of pneumonia?

[1] Difficulty in respiration, fever, chills, cough, headache

[2] Constipation, abdominal pain, cramps, blood clots

[3] Nasal congestion and discharge, cough, sorethroat, headache

[4] High fever, weakness, stomach pain, loss of appetite and constipation

Answer: Difficulty in respiration, fever, chills, cough, headache

231 Smack’ is a drug obtained from the:

[1] latex of Papaver somniferum

[2] leaves of Cannabis sativa

[3] flowers of Dhatura

[4] fruits of Erythroxyl coca

Answer: latex of Papaver somniferum

232 Transplantation of tissues/organs to save certain patients often fails due to rejection of such tissues/organs by the patient. Which type of immune response is responsible for such rejections?

[1] auto-immune response

[2] humoral immune response

[3] physiological immune response

[4] cell-mediated immune response

Answer: cell-mediated immune response

233 Anti venom against snake poison contains:

[1] Antigens

[2] Antigen-antibody complexes

[3] Antibodies

[4] Enzymes

Answer: Antibodies

234 One of the following is not the causal organism for ringworm

[1] Microsporum

[2] Trichophyton

[3] Epidermophyton

[4] Macrosporum

Answer: Macrosporum

235 The genes causing cancer are

[1] structural genes

[2] expressor genes

[3] oncogenes

[4] regulatory genes

Answer: oncogenes

236 Which of the following glands is large sized at birth but reducies in size with aging?

[1] Pineal

[2] Pituitary

[3] Thymus

[4] Thyroid

Answer: Thymus

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