Science (English Medium) कक्षा १२ - CBSE Important Questions for Biology

Cancer is one of the most dreaded diseases. Explain 'Contact inhibition' and 'Metastasis' with respect to the disease

Name the group of genes that have been identified in normal cells that could lead to cancer. How do these genes cause cancer?

Name any two techniques that are useful in detecting cancers of internal organs.

Why are cancer patients often given α-interferon as part of the treatment?

Name the causative organism of the disease amoebiasis. List three symptoms of the disease.

Prior to a sports event blood & urine samples of sports-persons are collected for drug tests.
(a) Why is there a need to conduct such tests?
(b) Name the drugs the authorities usually look for.
(c) Write the generic names of two plants from which these drugs are obtained. 

Indiscrimate diagnostic practices using X-rays etc., should be avoided. Give one reason.

A team of students are preparing to participate in the interschool sports meet. During a practice session you find some vials with labels of certain cannabinoids.

(a) Will you report to the authorities? Why?

(b) Name of a plant from which such chemicals are obtained.

(c) Write the effect of these chemicals on human body.

List the symptoms of Ascariasis. How does a healthy person acquire this infection?

Community Service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene.

(a) Why is there a need to organize such visits?

(b) Write the steps you will highlight, as a member of this department, in your interaction with them to enable them to lead a healthy life.

Suggest a method to ensure an anamnestic response in humans.

Write the complete name of the diagnostic test for AIDS.

State the mode of action of cocaine on the human body. Write the scientific name of the source plant it is obtained from.

Enumerate four most common warning signs of drug and alcohol abuse amongst the youth.

Why do doctors have to carry many tests for selecting a person to be a suitable donor for someone who is going for an organ transplant and not take the organ from just any body? Explain giving reason.

A boy developed some allergic reactions when he straight entered into his air conditioned room after a game of football outside his house. Write any two symptoms that could be noticed in such condition. How does our body combat such conditions?

Write the Scientific name of the plant from where natural Cannabinoids are obtained.

Mention the parts of the plant that are used for extracting the drug.

How does the drug affect human body?

Epithelial lining of our intestine is considered as secondary lymphoid organ. Justify the statement.