01:119:116 Lecture Notes - Lecture 8: Pollen Tube, Megaspore, Gametophyte

Give the possible genotypes and ploidy of the reproductive parts listed below if a pine tree with female megasporophylls have a genotype "aa" is cross pollinated by a male plant with cones which have microsporophylls with a genotype "Aa". These plants are usually dioecious.

microspore mother cell -

megaspore-

cells of cotyledon from resulting embryo after fertilization-

cells of the integument-

archegonia cells -

pollen grain cells-

sperm-

seed coat -

megagametophyte -

ovule and integuments-

Do these plants exhibit double fertilization?

Do these plants produce a fruit?

Do these plants have an ovary?

Question 1

The key innovation that allowed for plant survival on land, seenin the first land plants and all others after, but not in thecharophytes, is

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Question 2

Which dramatic change in the alternation-of-generations lifecycle led to the protection of all phases of the life cycle and theformation of seeds?

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Question 3

Which structure(s) allow the sporophyte of vascular plants to beprotected against drying out?

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Question 4

Why are the bryophytes called nonvascular plants?

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Question 5

Which generation is dominant in the bryophytes?

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Question 6

Which of the bryophytes are typically low-lying, due mostly totheir need for moisture and lack of vascular tissue?

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Question 7

Which structure of the moss protects the embryo from dryingout?

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Question 8

Cooksonia were the first __________ plants; they hadwind-blown spores, __________, leaves, and roots.

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Question 9

The roots of today's lycophytes are much like __________ were inearly vascular plants; the vascular tissue is __________.

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Question 10

Pteridophytes, or ferns and their allies, are __________vascular plants with __________.

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Question 11

Microphylls __________. Megaphylls__________.

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Question 12

The fern life cycle

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Question 13

Seed plants use meiosis to produce

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Question 14

In seed plants, a microspore develops into

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Question 15

Within the angiosperms, or ___________, two groups exist. Theyare named for their __________.

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Question 16

The __________ parts of a flower are the stamens, each of whichhas two parts: the anther and the filament. The __________ parts ofa flower are the carpel, which has three major regions: the stigma,the style, and the __________.

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Question 17

Double fertilization during the angiosperm life cycle involvestwo sperm, one of which __________, while the other __________.

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Question 18

The bodies of most fungi are made up of a network of filamentscalled hyphae.

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Question 19

What is the difference between land fungi and the chytrids?

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Question 20

The vast majority of described species of fungi are __________fungi, which include unicellular __________, which reproducesexually once their food supply runs out. When yeast ferment, theyproduce ethanol and carbon dioxide.

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1. A plant the lacks petals and has well-developed anthers ismost likely