Which of the following blood cells is responsible for humoral immunity?
A. Neutrophils
B. T lymphocytes
C. B lymphocytes
D. Macrophages
Answer: Option C
Solution (By JKSSB Mock Tests)
B lymphocytes differentiate into plasma cells that produce antibodies (immunoglobulins) against specific antigens, providing humoral immunity. T cells mediate cellular immunity, macrophages and neutrophils are phagocytes.
Explanation:
Guttation is the exudation of water droplets containing dissolved salts from hydathodes at leaf margins, occurring under high humidity and low transpiration, due to root pressure. Transpiration is loss of water vapor through stomata. Bleeding is oozing of sap from cut plant parts. Translocation is transport of organic solutes. Guttation is visible as morning dew drops.
Explanation:
Hemoglobin is an iron-containing metalloprotein in erythrocytes that binds oxygen reversibly, forming oxyhemoglobin. Each molecule has four heme groups, each binding one O₂. Collagen is a structural protein, insulin a hormone, fibrinogen a clotting protein. Hemoglobin also carries some CO₂ and buffers blood pH.
Consider the following statements about viruses:
1. The tobacco mosaic virus was the first virus discovered.
2. Viruses can have a protein coat called capsid.
3. Viruses can reproduce outside host cells.
Which of the above is/are correct?
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