2. How are gymnosperms different from angiosperms with respect to reproduction?

Question

2. How are gymnosperms different from angiosperms with respect to reproduction? 3. How do you tell monocots from eudicots? ristics that distinguish animals from other kingdoms. groups of animals. 6. What does symmetry tell you about the activities of an animal? 3 What characteristics of sponges indicate that they are a primitive group? Wh 7. ich animal phlyum has the most species? Give an explanation for the success of this group. 8. 9. Cephalopods are considered very advanced for invertebrates. In what ways are they advanced?

Explanation / Answer

2). Gymnosperms were the first seed plants they produce two kinds of gametophytes. Male gametophytes are called pollen grains and female gametophyte is called ovum (no ovary), seeds are not enclosed in an ovule. Pollen is transferred to an ovule by wind, insects and other agents, thus fertilization occurs. This wind pollination of gymnosperms is inherently inefficient and led to the evolution of angiosperms. Gymnosperms cannot produce fruits.

Angiosperms are the flowering plants, in which the ovule is completely enclosed by sporophyte tissue. Flowers are the reproductive organs of the angiosperms, the attractive colors and shape of the flowers induce insects and other animals to carry the pollen. Parts of the flower develop into the seed and the fruit after fertilization.

In angiosperms, anthers produce microspores and ovules produce megaspores. The megaspore is a haploid spore formed in an ovule, which gives rise to female gametophytes that produce eggs. Microspores are also haploid spores that give rise to pollen grains (male gametophytes).

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