Correct Answer: (b)
Lycophytes possess microphylls, which are simple leaves with a single unbranched vein. In contrast, pterophytes (and seed plants) have megaphylls or euphylls, which are larger and have branched vascular systems. These two types of leaves are considered to have independent evolutionary origins.
Q2. Which of the following correctly compares what happens to a spore mother cell as it gives rise to a spore with what happens to a spore as it gives rise to a gametophyte?
Correct Answer: (d)
In the haplodiplontic life cycle, the diploid (2n) spore mother cell within the sporangium undergoes meiosis to produce four haploid (n) spores. These haploid spores then undergo mitosis to grow into a multicellular haploid gametophyte.
Q3. Which of the following statements about the pterophytes is accurate?
Correct Answer: (d)
Pterophytes (which include ferns, whisk ferns, and horsetails) are vascular plants. A major evolutionary shift in vascular plants is the transition from a gametophyte-dominant life cycle to a life cycle where the diploid sporophyte is the larger, more complex, and independent phase.
Q4. A major innovation of land plants is embryo protection. How is a moss embryo protected from desiccation?
Correct Answer: (c)
Unlike their aquatic ancestors, land plants protect their embryos within female parent tissue. In mosses, the zygote is retained and protected from drying out within the archegonium, the flask-shaped female gametangium.
Q5. Evolutionary innovations that increase desiccation tolerance include
Correct Answer: (a)
The waxy cuticle was a fundamental innovation for land plants, acting as a structural barrier that prevents water from evaporating from the plant's surface. While ABA signaling helps regulate water stress and rhizoids aid in absorption, the cuticle is the primary barrier to desiccation.
Q6. Which of the following statements is correct regarding the bryophytes?
Correct Answer: (c)
Bryophytes have a dominant gametophyte generation which is haploid. Within this generation, specialized organs called gametangia (archegonia for eggs and antheridia for sperm) are formed to produce reproductive cells via mitosis.
Q7. The following evolutionary trends are seen in the seedless land plants:
Correct Answer: (d)
In seedless vascular plants, the embryonic sporophyte receives significant protection and nourishment from the gametophyte tissue. This trend of protecting the offspring within the parental structure was a key adaptation for terrestrial life.
Q8. Which of the following would NOT be found in a bryophyte?
Correct Answer: (c)
Bryophytes (mosses, liverworts, and hornworts) are non-vascular plants. Tracheid cells are specialized, lignified water-conducting cells that are the defining feature of vascular plants (tracheophytes). Bryophytes rely on diffusion and specialized conducting cells that lack the secondary cell wall thickening of tracheids.
Q9. Which of the following genera most likely directly gave rise to the land plants?
Correct Answer: (d)
Molecular and morphological evidence suggests that the charophytes are the closest living relatives of land plants. Specifically, members of the genus Chara share critical traits with land plants, such as the mechanism of cell division involving a phragmoplast and the presence of plasmodesmata.
Q10. Which of the following plant structures is NOT matched to its correct function?
Correct Answer: (d)
All listed structures are paired correctly with their physiological roles. Stomata are pores that facilitate gas exchange for photosynthesis. Tracheids are specialized cells in the xylem that conduct water. The waxy cuticle provides a waterproof barrier on the epidermis to minimize water loss (desiccation).
Q11. How could a plant without roots obtain sufficient nutrients from the soil?
Correct Answer: (b)
Early land plants lacked true roots. They survived by forming symbiotic relationships with mycorrhizal fungi, which effectively extended the plant's reach into the soil, facilitating the uptake of phosphorus and other essential nutrients in exchange for organic carbon.
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