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Bulbils on Agave vilmoriniana Paleoallium billgenseli bulbil with flowers. Within Agavoideae, bulbils develop on the inflorescence of a blooming plant. [3] [2] [4] The development of bulbils in this group is common in approximately 17 Agave species, all Furcraea species, and has been somewhat documented in Yucca (particularly Yucca elata), and Hesperaloe. [2]
The epithelium of the tubule consists of a type of sustentacular cells known as Sertoli cells, which are tall, columnar type cells that line the tubule.. In between the Sertoli cells are spermatogenic cells, which differentiate through meiosis to sperm cells.
During the Renaissance, artist and scientist Leonardo da Vinci famously sketched his observations from human dissections, as well as his studies of plants and the flight of birds. In the mid-16th century, the physician Andreas Vesalius compiled and published the De humani corporis fabrica , a collection of textbooks on human anatomy superior to ...
Plant reproductive morphology is the study of the physical form and structure (the morphology) of those parts of plants directly or indirectly concerned with sexual reproduction. Among all living organisms, flowers , which are the reproductive structures of angiosperms , are the most varied physically and show a correspondingly great diversity ...
Human sperm cells can survive within the female reproductive tract for more than 5 days post coitus. [15] Semen is produced in the seminal vesicles, prostate gland and urethral glands. In 2016, scientists at Nanjing Medical University claimed they had produced cells resembling mouse spermatids from mouse embryonic stem cells artificially. They ...
Plant reproduction is the production of new offspring in plants, which can be accomplished by sexual or asexual reproduction. Sexual reproduction produces offspring by the fusion of gametes , resulting in offspring genetically different from either parent.
Diagram of flower parts. In botany, floral morphology is the study of the diversity of forms and structures presented by the flower, which, by definition, is a branch of limited growth that bears the modified leaves responsible for reproduction and protection of the gametes, called floral pieces.
Bite area decreases with the density of the plants but increases with their height. Bite area is determined by the sweep of the tongue; in one study observing 750-kilogram (1,650 lb) steers, bite area reached a maximum of approximately 170 cm 2 (30 sq in). Bite depth increases with the height of the plants.