The structure that prevents food from entering the trachea is the:
A. Uvula
B. Glottis
C. Tongue
D. Epiglottis
Answer: Option D
Solution (By JKExamLibrary)
The epiglottis is a cartilage flap that covers the glottis (laryngeal opening) during swallowing, directing food into the esophagus and protecting the airway. The tongue manipulates food, the uvula prevents nasal regurgitation.
Explanation:
Nostoc is a cyanobacterium (blue-green alga) that fixes atmospheric nitrogen and is used as a biofertilizer in rice paddies. Anabaena azollae with Azolla is also common. Rhizobium is bacterial biofertilizer for legumes, Azospirillum is a free-living nitrogen-fixing bacterium. Trichoderma is a fungal biocontrol agent. BGA biofertilizers increase organic nitrogen in soil.
Explanation:
Energy pyramids are always upright because energy decreases at higher trophic levels. Pyramids of numbers and biomass can be inverted (e.g., tree ecosystem, aquatic).
Explanation:
Xenogamy is the type of cross-pollination where pollen grains are transferred from the anther of one plant to the stigma of a genetically different plant. This promotes genetic diversity. Autogamy is self-pollination within the same flower. Geitonogamy is the transfer of pollen between different flowers on the same plant (functionally cross-pollination but genetically self-pollination). Cleistogamy is closed, self-pollinating flowers.
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