Q3 of 30 Page 1

“Pranay suffered from measles at the age of 10 years. There are rare chances of his getting infected with the same disease for the rest of his life.” Give reason for the statement.

There are rare chances of Pranay getting infected with measles for the rest of his life due to the acquired immunity. It is characterised by memory.


Our body when encounters a pathogen for the first time, it produces a response called primary response which is of low intensity. Subsequent encounter with the same pathogen elicits a highly intensified secondary response.


More from this chapter

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1

The following statements describe the wind-pollinated plants. Which one of these statements is incorrect?

(i) The pollen grains are sticky.


(ii) Stamens are well exposed.


(iii) Flowers often have a single ovule.


 2

Write the formula to calculate allele frequency in future generations according to Hardy - Weinberg genetic equilibrium.

 4

Give the name of the carcinogenic dye which is used to stain gel to make the DNA visible under UV light.

 5

Which main technique and instrument is used to isolate DNA from a plant cell?