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why can gymnosperms live in dry environments than seedless vascular plants and nonvascular plants?
why can gymnosperms live in dry environments than seedless vascular plants and nonvascular plants?
4 Answers
- Almost MaratheLv 79 years agoFavorite Answer
The root system allows pine trees to survive dry conditions. The roots usually are as deep as the tree is tall, and longer in some instances. The Ponderosa pine contains most of its roots between two and 40 feet below the surface of the ground. The roots also are widespread, and can reach out as wide as the tree is tall. For the Ponderosa pine, this is more than 100 feet in some cases. Other pine varieties, such as the Italian stone pine and the pinion pine. have root systems that reach 60 to 80 feet out from the trunk. This allows the roots to take in as much moisture as possible from a wide area.
Source(s): Read more: How Do Pine Trees Survive in a Dry Climate? | eHow.com http://www.ehow.com/about_6635625_do-trees-survive... - Anonymous9 years ago
Your teacher wants you to mention:
The sperm nuclei are encapsulated in pollen grains which resist drying while still allowing the sperm to eventually reach the ovum. The sperm of a gymnosperm never ever have to swim through a moist external environment.
In seedless vascular plants (e.g. ferns) and nonvascular plants, the sperm has a flagellum and does indeed need to swim through a moist external environment. So, these guys are going to be confined to spots that are moist at some times.
