Answer:
Calcium
Explanation:
Parathyroid hormone (PTH) is a hormone that is secreted by the parathyroid gland. It is the major regulator of the plasma concentration of calcium ions. It regulates calcium ions in the kidney, intestine and bones.
In the kidney, is involved in the re-absorption of calcium in distal ducts and the renal collecting duct, it is also involved in activating the conversion of 25-hydroxy vitamin D into 1,25-dihydroxy vitamin D (calcitriol).
In the intestine, PTH is involved in the absorption of calcium, by increasing vitamin D production.
In the bone, it helps in regulating calcium levels; when serum calcium level is low, PTH stimulates the activity of the osteoclast, to produce more calcium.
Eukaryote cells:
-has a nucleus
-tends to be multicellular (consisting of many cells)
-meiosis + fusion of gametes (sex cells)
-have mitochondria (powerhouse of the cell)
eg) animal and plant cells
Prokaryote cells:
-no nucleus (or membrane-bound nucleus)
-tends to be unicellular (consisting of one cell)
-no mitochondria
-partial meiosis
eg) bacteria and archaea
Answer:
1. Autotrophs
2. The Sun
3. Consuming Other Organisms
Answer:
Scientific question:
Does light intensity effect the growth of a plant?
Hypothesis:
If the light intensity is increased, then the plants will grow more.
Experiments and observation:
Place a plant in dark, take three other plants and vary the amount of light intensity in them. For plant 1, the light could be given for 2 hours a day. For plant 2,the light could be given for 4 hours a day. For plant 3, the light could be given for 6 hours a day.
Results:
We see that the plant which received 6 hours of light grew more.
Conclusion:
The hypothesis is correct. The light intensity effects the growth of plants. Plants which receive more light grow more.
