Which of the following statements about the lymphatic system is correct?
A. Lymph nodes produce red blood cells.
B. It circulates blood throughout the body.
C. It returns interstitial fluid to the bloodstream.
D. The thymus is a secondary lymphoid organ.
Answer: Option C
Solution (By JKSSB Mock Tests)
The lymphatic system drains excess tissue fluid (lymph) back to the venous blood. Blood circulation is the cardiovascular system; lymph nodes filter lymph; thymus is a primary lymphoid organ.
Explanation:
Molecular oxygen (O₂) accepts electrons at the end of the electron transport chain, combining with protons to form water (metabolic water). Without oxygen, the chain backs up, stopping ATP production. This is why oxygen is vital for aerobic respiration. NAD⁺ and FAD are electron carriers, cytochrome c a component.
Explanation:
Diphtheria affects the throat, forming a pseudomembrane, and releases a toxin affecting the heart and nerves. Tetanus is Clostridium, pertussis Bordetella, typhoid Salmonella.
Explanation:
The law of independent assortment states that alleles of different genes segregate independently of each other during gamete formation, provided the genes are on different non-homologous chromosomes. If genes are linked (on the same chromosome), they tend to be inherited together unless crossing over occurs. This law was derived from Mendel's dihybrid crosses, yielding the 9:3:3:1 ratio.
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