#Question id: 40479
#Applied Microbiology
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Dendritic cells are critical for initiating a primary immune response.
Reason (R): They are the only antigen-presenting cells capable of stimulating naive T cells.
#Question id: 40480
#Applied Microbiology
Match the Immune Cell (List I) with its primary characteristic/function (List II).
| List I (Cell Type) | List II (Characteristic) |
| A. B cell | 1. Granulocyte involved in allergic responses; releases histamine. |
| B. Dendritic cell | 2. Produces antibodies; acts as an APC. |
| C. Basophil | 3. Phagocyte; acts as a scavenger and APC. |
| D. Macrophage | 4. Most effective APC; bridge between innate and adaptive immunity. |
#Question id: 40481
#Applied Microbiology
Which specific chemical element, released from CFCs in the stratosphere, acts as a catalyst to break down Ozone (O3) into Oxygen (O2)
#Question id: 40482
#Applied Microbiology
Which international treaty was signed specifically to control the emission of Ozone Depleting Substances (ODS) like CFCs?
#Question id: 40483
#Applied Microbiology
While HFCs (Hydrofluorocarbons) were introduced to replace CFCs because they do not deplete the ozone layer, they are still problematic. Why?
#Question id: 40484
#Applied Microbiology
Read the following statements regarding the breakdown of the ozone layer:
Statement I: UV radiation acts upon Chlorofluorocarbons (CFCs) in the stratosphere to release active Chloride radicals.
Statement II: A single Chlorine radical is consumed after destroying one Ozone molecule and cannot participate in further reactions.
Which of the options is correct?