Advertisements
Advertisements
प्रश्न
A student on a school trip started sneezing and wheezing soon after reaching the hill station for no explained reasons. But, no return to the plains, the symptoms disappeared. What is such a response called? How does the body produce it?
उत्तर
The responses such as sneezing and wheezing for no explained reasons is called allergy. The substance against which the immune system show such exaggerated response are termed as allergens. Body produces IgE type of antibody against allergens as a response. Most common example of such allergens are pollen grains, dust etc.
APPEARS IN
संबंधित प्रश्न
(a) Plan an experiment and prepare a flow chart of the steps that you would follow to ensure that the seeds are formed only from the desired sets of pollen grains. Name the type of experiment that you carried out.
(b) Write the importance of such experiments
What type of cell division occurs during microsporogenesis and megasporogenesis events?
Draw a T.S. of a young anther of an angiosperm. Label the different layers of the wall and write their functions.
Exine of pollen grain is formed of ______.
Which one produce androgenic haploids in anther cultures?
Nonessential floral organs in a flower are ______.
The stamens represent ______.
Several pollen grains form a unit designated as pollinium in Family ______.
Pollen kitt is generally found in ______.
Mark the odd one.
