Explain the difference between homosporous and heterosporous plants
What will be an ideal response?
ANSWER: When a plant makes only one type of spore, it is said to be homosporous, meaning “same
spore”. A gametophyte that develops from such a spore is bisexual because it can produce
both sperm and eggs. The sperm have flagella and swim through liquid water in order to
encounter female gametes. Other vascular plants are heterosporous. They produce two
types of spores in two different types of sporangia, and those spores develop into small,
sexually different gametophytes. In seed plants, the smaller spore type develops into a male
gametophyte, a pollen grain. The larger one develops into a female gametophyte, in which
eggs form and fertilization occurs.
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Certain plants may form tissues called ________ when their roots are flooded, whereas other plants may always form these tissue types.
A. parenchyma. B. collenchyma. C. sclerenchyma. D. aerenchyma. E. None of the choices is correct.
Which disease may develop when microbes enter the blood stream directly via IV drug use or dental
work? a. rheumatic fever b. hypertension c. endocarditis d. myocarditis e. malignant melanoma
Why are carbon dioxide fluctuations more pronounced in the Northern Hemisphere?
A) larger CO2 emissions B) more terrestrial habitat C) more humans D) more solar energy absorbed
The woody plant genus Frankia produces root nodules that harbor
a. actinobacteria b. rhizobium c. fungi d. green algae e. aktinites