Question

in ferns, the plant structure that produces sperm and egg cells is known as which of the following?
a) sporophyte
b) spores
c) zygote
d) gametophyte
question 4 (5 points)
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which of the following best describes why invertebrates isnt considered a scientifically valid word when classifying animals?
a) the term invertebrates is unhelpful because all animals possess some sort of backbone or notochord.
b) the term invertebrates is too vague, since all animals evolved from single-celled organisms without a backbone.
c) the term invertebrates classifies animals haphazardly based on a missing characteristic rather than a common one

Explanation:

First Question (Ferns and reproductive structures)

• Option A (Sporophyte): The sporophyte in ferns is the diploid, spore - producing stage, not the stage that produces gametes (sperm and egg).
• Option B (Spores): Spores are reproductive cells that develop into gametophytes, they do not produce sperm or egg cells themselves.
• Option C (Zygote): A zygote is formed when a sperm fertilizes an egg, it is the result of gamete fusion, not the structure that produces gametes.
• Option D (Gametophyte): In the fern life cycle, the gametophyte is the haploid stage that produces the gametes (sperm and egg cells) through mitosis.

Second Question (Invertebrate classification)

• Option A: Not all animals have a backbone or notochord. Invertebrates are defined as animals without a backbone, and there are many animals (like insects, worms) that lack a backbone or notochord. So this statement is incorrect.
• Option B: The evolution from single - celled organisms is not related to the validity of the term "invertebrates" in classification. The classification of invertebrates is about the presence or absence of a backbone, not about evolutionary origin from single - celled organisms.
• Option C: In scientific classification, groups are usually defined by shared characteristics. "Invertebrates" is defined by the absence of a backbone (a negative characteristic) rather than a positive, shared characteristic among all invertebrates. For example, invertebrates include a wide range of organisms (like mollusks, arthropods, cnidarians) that have very different body plans, physiological processes, etc., and the only thing they share is the lack of a backbone. This makes the classification haphazard as it groups organisms together based on what they don't have rather than what they do have in common.

Answer:

D) Gametophyte