2. Examine handout #4, which contains the Life Cycle of a typical Gymnosperm tre

Question

2. Examine handout #4, which contains the Life Cycle of a typical Gymnosperm tree, a pine; and one of a typical Angiosperm tree, an oak. Answer questions a-e below. a. Within what structures are the embryos of all trees located? 1. Cones 2. Flowers. 3. Seeds. b. True or False. Gymnosperms are much more reliant on wind pollination than Angiosperms. c. True or False. The pollen grain of all plants, including trees, contains the sperm nuclei, i.e. "male DNA". the female d. In pine trees, within what "hard" structure does fertilization occur? e. True or False. An acorn consists of the mature ovary of an oak tree as well as its embryo.

Explanation / Answer

2.

a. Seeds

Embryos of all trees are enclosed within seeds, which provide nourishment and protection to embryo.

b. True

Gymnosperms do not have flowers to attract insects. These have male cones and female cones. So there is dependence on the wind which blow the pollen from male cones to female cones.

c. True

The pollen grain contains the genetic material of male which then combines with egg nuclei to form zygote.

d. Cones

Cones are specialized structures which bear the microspres and the megapores and in which pollination occurs.

e. True

An acorn is a nut of oak tree which contains usually a single seed within which there is embryo. An acorn is the mature ovary of an oak tree.

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