How does the transmission of each of the following diseases take place?
(b) Malaria

How does the transmission of each of the following diseases take place?
(c) Ascariasis

133.

How does the transmission of each of the following diseases take place?
(d) Pneumonia

Name any two types of cells that act as 'cellular barriers' to provide innate immunity in humans.

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

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

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

(d) Why are cancer patients often given I interferon as part of the treatment?

Indiscriminate 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.

Why sharing of injection a needle between two individuals is not recommended?

A student on a school trip started sneezing and wheezing soon after reaching the hill station for no explained reasons. But, on return to the plains, the symptoms disappeared. What is such a response called? How does the body produce it?

Write the function of adenosine deaminase enzyme. State the cause of ADA deficiency in humans. Mention a possible permanent cure for ADA deficiency patient.