Biotechnology — BIOLOGY STD 12 Science — Question

Distinguish between: Phase of cell division and Phase of cell enlargement

Read the following and answer any four questions from (i) to (v) given below: Siddharth is a chain smoker. He got into this habit in early adolescence due to peer pressure and gradually got addicted to this habit. Its now almost 20 years he is into the habit of smoking. Since few months he is experiencing pain in chest, shortness of breath, wheezing and chronic cough with phlegm. He seeked advice of a medical practitioner who diagnosed him with lung cancer. Based on the above information, answer the following questions.

1. What do you think is the possible carcinogen responsible for Siddharth's lung cancer?

1. Nitrosamines
2. Benzo(a)pyrene
3. Hydrazine
4. All of these

2. How is lung cancer diagnosed?

1. Computerised tomography scan
2. Sputum cytolog
3. Biopsy of lung tissue
4. All of these

3. From which of the following type of cancer is Siddharth suffering from?

1. Sarcoma
2. Carcinoma
3. Lymphoma
4. Leukemia

4. Select the correct statement.

1. Surgery, radiotherapy and chemotherapy can be used to treat lung cancer.
2. Chemotherapy involves the exposure of cancerous parts to X rays which destroy rapidly growing cancer cells.
3. Surgical removal of lung cancer tissue is suggested at advanced stage 4.
4. Monoclonal antibodies can effectively treat lung cancer and can cure it completely.

5. Assertion: Lung cancer if not treated at an early stage can spread to other initial organs of the body.

Reason: Cancer cell have uncontrolled proliferation and ability to invade new sites (metastasis).

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

Distinguish between : Eosinophils and Basophils.

Distinguish between : Carbon cycle and phosphorus cycle.

Read the following and answer any four questions from (i) to (v) given below:
Riya studies in 11 standard in a government school. She belongs to a backward family and her parents did not get her properly vaccinated according to immunisation programme. Once while playing in school playground she fell down due to weakness and developed high fever, headache and stiffness in her neck. identify the illness she could be suffering from and answer the following questions.

1. The microbe responsible for Riya's illness could be.

1. Vibrio cholerae
2. Enterovirus
3. Plasmodium
4. Mycobacteriurn.

2. Which vaccine, if administered earlier, would have saved Riya from the illness she unfortunately contracted?

1. Salk vaccine
2. MMR vaccine
3. BCG vaccine
4. Varicella vaccine

3. The disease that Riya has contracted spreads through.

1. Bite of an infected mosquito
2. Bite of an infected dog
3. Faecal oral route
4. Direct contact with the infected person.

4. Riya can spread her illness to other children through.

1. Her faeces
2. Direct contact
3. Coughing and sneezing in open
4. Vectors.

5. Assertion: Polio produces inflammation of the nervous system.

Reason : Stiffness of the neck, paralysis of particular skeletal muscle, is an important symptom of polio.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false.

Distinguish between : Vital Capacity of Lung and Total Lung Capacity.