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1) What are the evolutionary advantages of the gymnosperms?

2) What is the value of wind dispersal of pollen?

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Lelia Lubowitz
Lelia LubowitzLv2
28 Sep 2019

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Related questions

What is distinct about the structure of gymnosperms pollen? How does this structure relate to the function of gymnosperms pollen grains? How might this relate to the fact that staminate cones are located at the tips of gymnosperms branches?

19. Most trees in tropical forests are pollinated by animals. Why is wind pollination a rare condition in tropical forests? a. Dense canopies prevent the dispersal of pollen by wind. b. Wind is less prevalent in tropical environments. C. Wind pollination results in a high incidence of self-pollination. d. Tree densities in tropical forests are too high for wind pollination.

Question 1: A slide of a terminal plant bud shows what physical characteristics demonstrating growth?

Answers:

1. an actively dividing group of cells between primordial leaves with undifferentiated vascular tissue

2. a vascular system with vascular bundles

3. spongy mesophyll tissue

4. sieve tubes, vessel elements and tracheids


Question 2: As the earth warmed and dried around 150 MYA, plants requiring _______ for fertilization were no longer dominant, but were eclipsed by plants that were ______ bearing named ___________ (literally naked seeds). These plants used _____ for fertilization freeing themselves from dependence on water. As animals of the era became terrestrial with means of terrestrial reproduction strategies, plants did the same using two different structures along with internal fertilization, the _____ being internal and fertilized by a wind carried _________ grain.

Answers:

1. water, seed, charophytya, dinosaurs, zygote, pollen

2. water, seed, gymnosperms, wind, egg, pollen

3. spores, cone, tracheids, water, pollen, embryo

4. water, flower, angiosperms, animals, spore, egg


Question 3: In the pith region of a stem the vascular system consists of two major structures;

Answers:

1. Phloem with trachieds and vessel elements and xylem with sieve-tubes and companion cells

2. Sclerechyma fibers and parenchyma cells

3. Phloem carrying photosynthesis products and xylem carrying water with dissolved nutrients

4. Phloem carrying water with dissolved nutrients and xylem carrying photosynthesis products.

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