Answer: Benign: localized, non-invasive, grows slowly, not life-threatening; Malignant: invasive, can metastasize, life-threatening.
- A Both tumour types tend to grow at similar rates and are considered equally invasive and life-threatening in typical laboratory settings
- B Benign: localized, non-invasive, grows slowly, not life-threatening; Malignant: invasive, can metastasize, life-threatening
- C Benign tumours often metastasize through the blood and lymph to colonize distant organs under usual circumstances according to most researchers
- D Malignant tumours are usually curable through simple surgical removal of the tumour mass in the majority of cases studied
Correct answer: B. Benign: localized, non-invasive, grows slowly, not life-threatening; Malignant: invasive, can metastasize, life-threatening
Explanation: Benign tumour: enclosed in a capsule, does not invade surrounding tissue, does not metastasize, grows slowly, usually not life-threatening. Malignant tumour (cancer): invasive, can spread via blood/lymph to form secondary tumours elsewhere (metastasis), life-threatening.
The Plasmodium parasite needs both hosts: the female Anopheles mosquito injects sporozoites while biting (infecting the human liver and RBCs, causing the malaria fever cycle), then picks up gametocytes from an infected person's blood, completing the parasite's sexual stage inside the mosquito.
Concept context
Pathogens, infectious diseases, non-infectious diseases, drugs, cancer, and public health. High NEET importance.