In neurons, the absolute refractory period is caused by the inactivation of the Sodium (Na⁺) channels that originally opened to depolarize the membrane.
Answer:
the division of cytoplasm is unequal in oogenesis, whereas it is equal in spermatogenesis
Explanation:
Spermatogenesis includes meiosis in primary spermatocytes. These are the diploid cells and completion of meiosis in one primary spermatocyte forms four haploid spermatids. The process of cytokinesis at the end of meiosis-I and meiosis-II equally divides cytoplasm among the daughter cells. Therefore, all the cells produced have an equal amount of cytoplasm.
On the other hand, oogenesis includes unequal cytokinesis by the end of meiosis-I and meiosis-II. It produces a larger secondary oocyte and a relatively smaller first polar body by the end of meiosis-I. Similarly, the mature egg cell is also larger than the second polar body. This occurs so that the zygote can have enough cytoplasm to enter mitosis.
Answer:
The correct answer is - False.
Explanation:
Water vapor is water in its gaseous state. Water vapor is totally invisible, an individual can not see water vapor in any situation with naked eyes. Fog, clouds, mist are not the water vapor as they contain liquid water or droplets.
Water vapor is essential for the weather and climate, without water vapor there would be no rain, snow or clouds as require water vapor to form.
Thus, the correct answer is - false.
Solar because the sun gives radiant energy to plants to make food which makes oxygen in the process. animals eat the plants to get energy and the food chain goes on. With out the plants turning the sun into food then we wouldn't be around.