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The cycads, a mostly tropical phylum of gymnosperms, evolved about 300 million years ago and were dominant forms during the Age of the Dinosaurs. Though their sperm are flagellated, their ovules are pollinated by beetles. These beetles get nutrition (they eat pollen) and shelter from the microsporophylls. Upon visiting megasporophylls, the beetles transfer pollen to the exposed ovules. In cycads, pollen cones and seed cones are borne on different plants. Cycads synthesize neurotoxins, especially in the seeds, that are effective against most animals, including humans.
-What is True of stamens, sepals, petals, carpels, and pinecone scales?
Q7: Foods can be preserved in many ways
Q10: The swim bladder of ray-finned fishes<br>A)was probably
Q13: Which of Lystrosaurus' features help explain why
Q15: Which of the following is a diploblastic
Q24: The adaptation of snakes to their body
Q48: The common ancestors of birds and mammals
Q61: Which structure is common to both gymnosperms
Q77: An organism has a relatively large number
Q82: Which feature of cycads distinguishes them from
Q82: Which of the following is a characteristic