Ethylene (C₂H₄) is the only gaseous plant hormone, known for promoting fruit ripening, leaf abscission, and senescence. Auxin, cytokinin, gibberellin, and abscisic acid are non-gaseous compounds. Ethylene is used commercially to ripen fruits like bananas and tomatoes.
Explanation:
Ficus religiosa is the sacred fig or peepal tree. Ficus benghalensis is the banyan tree, Azadirachta indica is neem, and Mangifera indica is mango. The peepal tree has heart-shaped leaves with a characteristic elongated tip, and is of religious significance in India.
Explanation:
The blood-brain barrier (BBB) is formed by tight junctions between endothelial cells of brain capillaries, restricting the passage of pathogens and large molecules. Meninges cover the brain, choroid plexus makes CSF, corpus callosum connects hemispheres.
Explanation:
Streptococcus thermophilus and Lactobacillus bulgaricus are used as starter cultures in yogurt production. They ferment lactose to lactic acid, causing milk proteins to coagulate, giving yogurt its thick texture and tangy taste. Bacillus cereus causes food poisoning, E. coli can be pathogenic, Salmonella causes typhoid.
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