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| method of forming complex organic materials using sunlight as energy source |
| ovules which are unenclosed, forming on cones or stalks |
| pollen tube | |
| —n | |
| a hollow tubular outgrowth that develops from a pollen grain after pollination, grows down the style to the ovule, and conveys male gametes to the egg cell | |
| pollen tube
The slender tube that is formed after pollination by division of the tube cell in a pollen grain. The pollen tube penetrates the ovule and releases the male gametes. |