The infective stage of the malarial parasite in humans is:
A. Merozoite
B. Gametocyte
C. Sporozoite
D. Trophozoite
Answer: Option C
Solution (By JKExamLibrary)
The sporozoite is the motile infective stage injected by the female Anopheles mosquito into the human host. It invades liver cells. Gametocytes are the stage taken up by the mosquito, merozoites are released from liver and infect RBCs.
Assertion (A): Mitochondria are called semi-autonomous organelles. Reason (R): They possess their own DNA and ribosomes and can synthesize some proteins.
A.Both A and R are true, and R is the correct explanation.
B.Both A and R are true, but R is not the correct explanation.
Explanation:
Mitochondria have circular DNA and 70S ribosomes, enabling them to transcribe and translate some proteins independently, hence semi-autonomous. They still depend on nuclear genes for most proteins. The reason correctly explains the assertion.
Explanation:
The spleen filters blood, removing aged or damaged RBCs, recycles iron, and stores platelets. The liver also processes hemoglobin products, but the spleen is the primary organ for RBC removal. The kidneys filter blood but don't remove RBCs.
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