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Step-by-step explanation:
18.Like all seed plants, gymnosperms are heterosporous: both sexes of gametophytes develop from different types of spores produced by separate cones.The other type of cones, the larger “ovulate” cones, make megaspores that develop into female gametophytes called ovules.
19. The binomial nomenclature system combines two names into one to give all species unique scientific names. The first part of a scientific name is called the genus. The second part of a species name is the specific epithet. Species are also organized into higher levels of classification.
20. Floral characters
Floral charactersPerianth: Indistinctive sepal and petal; six petals (3+3), often united sepals; valvate aestivation. Androecium: Six stamens in two whorls (3+3). Gynoecium: Syncarpous, tricarpellary, trilocular, superior ovary with axile placentation. Fruit: Berry or often Capsule.
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