Explanation:
Abscission is the controlled shedding of leaves, flowers, or fruits, facilitated by the hormone ethylene and enzymes that degrade cell walls at the abscission zone. Senescence is the aging process leading to cell death. Transpiration is water loss, germination is seed sprouting.
Explanation:
Folic acid is crucial for DNA synthesis and cell division; deficiency during early pregnancy increases risk of neural tube defects like spina bifida. Supplementation is recommended. B₁ is for carbohydrate metabolism, B₁₂ for nerve function, C for collagen.
Consider statements about human diseases: 1. Typhoid is caused by a bacterium. 2. Malaria is caused by a protozoan. 3. Dengue is caused by a virus. Which are correct?
Explanation:
Typhoid fever is a systemic bacterial infection caused by Salmonella enterica serotype Typhi, transmitted through contaminated food and water. Malaria is a life-threatening disease caused by protozoan parasites of the genus Plasmodium (like P. falciparum), transmitted by Anopheles mosquitoes. Dengue fever is a viral infection caused by the Dengue virus (a flavivirus), transmitted by Aedes mosquitoes. All three statements correctly identify the causative agents of these major diseases.
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