The movement of pollen grains from anther to stigma of the same flower is called: MCQ with Answer and Explanation

Explanation:
The cell membrane (plasma membrane) is selectively permeable, regulating the passage of substances in and out of the cell. The cell wall is a rigid, non-living outer layer present in all plant cells, providing structural support and shape. The nucleus is the control center of the eukaryotic cell, housing the genetic material (DNA) and directing cellular activities like growth, metabolism, and reproduction. All three statements are correct.

Explanation:
Prophase I of meiosis is divided into five sub-stages: leptotene, zygotene, pachytene, diplotene, and diakinesis. Crossing over, the exchange of genetic material between non-sister chromatids of homologous chromosomes, occurs specifically during the pachytene stage at structures called recombination nodules.

Explanation:
Luteinizing hormone (LH) binds to Leydig cells in the testes, stimulating them to produce and secrete testosterone. FSH stimulates Sertoli cells for spermatogenesis. GnRH from hypothalamus stimulates release of LH and FSH.