Water in plants is the first donor in photosynthesis. They help the plants to grow and obtain the nutrients that they need, such as oxygen. The water is considered to be the ultimate electron donor in the photosynthesis because without the water, the plant will not sustain life.
Answer:
C. Bind and maintain high concentrations of testosterone in the seminiferous tubules.
Explanation:
Seminiferous tubules are present within the testis of male reproductive system. In adults, each testis is oval in shape and is about 4-5 cm in length. Each testis has about 250 compartments called testicular lobules. These compartments contain highly coiled tubules called seminiferous tubules.
Within the seminiferous tubules, the male gamete i.e sperms are produced. Seminiferous tubules are lined inside by two types of cells called male germ cells (spermatogonia) and sertoli cells.
Spermatogonia give rise to spermatozoa which are released into the lumen of the tubule. In between spermatogenic cells, sertoli cells or sustentacular cells or nurse cells are present which provide nourishment to developing spermatozoa.
One of the function of sertoli cells are to release androgen binding protein (ABP) which binds and concentrates testosterone with in the seminiferous tubules.
The hormone testosterone is produced by the interstitial cells of Leydig located around the seminiferous tubules.
Answer:
D
Explanation:
Igneous rock is found in magma chambers most commonly
Answer:
limiting factors
Explanation:
They are called limiting factors, because they limit the amount of food resources and/or organism amount in an area or ecosystem.