Answer:
B. Sodium ions directly enter the cells, indicating the signal is transduced by an ion channel.
D. Sweet utilizes the GPCR signaling pathway, activating phospholipase C.
Explanation:
The taste received by the taste buds is processed through different channels
a) The Sweet, bitter, and umami tastes are transduced by the GPCR (G-protein-coupled receptors) signaling pathway
b) Sour taste reaches the taste bud through the acidification of acid-sensitive membrane proteins with in the taste cell
c) The epithelial sodium channels in the renal tissues directly takes up the salty taste
Hence, option B and D are correct
A) To add medicines to foods that people eat
Answer:
Nearly 50%
Explanation:
The earth about 8000 years back was comprised of almost 6 billion hectares of forest-covered land. And according to the research, it has been observed that nearly 50% of the initially forest-covered region has been reduced, which has now become about 3 billion hectares.
These forests are being cut down for various purposes, such as construction of urban areas, construction of wooden houses, making furniture, overgrazing of animals, forest fire. It causes both naturally as well as due to anthropogenic activities.
Thus, nearly 50% of the forest is reduced in the last 8000 years.