Weathering is an important phenomenon of the geochemical cycle as it contributes to the relief formation. It corresponds to a general term applied to physical and chemical changes suffered by rocks as a consequence of their exposition to different conditions of humidity and temperature. In this book
Pollen: Structure, Types and Effects : Structure, Types and Effects
β Scribed by Benjamin J. Kaiser
- Publisher
- Nova Science Publishers, Incorporated
- Year
- 2010
- Tongue
- English
- Leaves
- 384
- Series
- Environmental Science, Engineering and Technology
- Edition
- 1
- Category
- Library
No coin nor oath required. For personal study only.
β¦ Synopsis
Pollen is a fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes (sperm cells). Pollen grains have a hard coat that protects the sperm cells during the process of their movement between the stamens to the pistil of flowering plants or from the male cone to the female cone of coniferous plants. When pollen lands on a compatible pistil of flowering plants, it germinates and produces a pollen tube that transfers the sperm to the ovule of a receptive ovary. Among other topics, this book reviews research on pollen biology and the hybridization process in walnuts, modern conception on the structure and development of the sunflower anther; the role of anion channels in pollen germination and tube growth.
β¦ Subjects
Pollen. ; Palynology.; NAT026000
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