Try Penny's Botanical Quiz
Questions: 16 · 10 minutes
1. In botanical terms, what are the spines of most cacti?
Exposed strands of xylem
Hardened aerial roots
Modified leaves
Immature flower stalks
2. During drought, a plant's guard cells cause many stomata to close. What is the most direct benefit?
More pollen can enter the leaf
Mineral absorption by the roots stops completely
Water loss through transpiration is reduced
The leaves absorb more water vapor for photosynthesis
3. A flower receives compatible pollen on its stigma, but fertilization never occurs. Which statement is most accurate?
A pollen tube must still deliver male gametes to an ovule for fertilization
The petals will carry the pollen directly into each ovule
The pollen has already fertilized the ovules by touching the stigma
Pollination alone guarantees that a mature fruit will form
4. Which vascular tissue mainly transports water and dissolved minerals upward from a plant's roots?
Cambium
Phloem
Xylem
Epidermis
5. A houseplant's leaves are yellowing, its soil stays wet for days, and its roots are becoming soft and brown. What is the most appropriate first response?
Move it into deeper shade and mist it daily
Prune every leaf but leave the roots undisturbed
Add fertilizer while keeping the soil consistently wet
Remove damaged roots, improve drainage, and water less often
6. What important process is commonly associated with bacteria living in the root nodules of legumes?
Producing pollen for the plant's flowers
Turning glucose directly into sunlight
Converting atmospheric nitrogen into compounds the plant can use
Preventing all water loss through the leaves
7. A newly transplanted plant wilts during a warm afternoon even though its soil is moist. What is the most likely immediate explanation?
Water loss from the leaves is temporarily exceeding uptake by the disturbed roots
Its leaves have stopped carrying out cellular respiration
Its xylem has permanently changed into phloem
Moist soil prevents water from entering healthy roots
8. A normally compact seedling becomes unusually tall, pale, and weak after growing in darkness. What is this growth pattern called?
Etiolation
Vernalization
Translocation
Scarification
9. In which plant-cell structure does most photosynthesis take place?
Vacuole
Mitochondrion
Nucleus
Chloroplast
10. Why do most germinating seeds require oxygen?
Oxygen directly turns the seed coat into roots
Oxygen supplies the nitrogen needed to build chlorophyll
Oxygen acts as the seed's main stored food reserve
Oxygen supports cellular respiration, releasing energy for growth
11. Which feature distinguishes ferns from mosses?
Ferns reproduce only by seeds, whereas mosses reproduce only by flowers
Ferns lack chlorophyll, whereas mosses contain it
Ferns are always aquatic, whereas mosses are always terrestrial
Ferns have vascular tissue and true roots, while mosses lack true vascular tissue
12. A seedling beside a window bends toward the light. Which explanation best describes this response?
Cells on the illuminated side divide until they push the stem sideways
Greater elongation on the shaded side causes the shoot to curve toward light
Roots pull the stem toward the brightest available area
Water evaporating from the bright side physically draws the shoot sideways
13. A variegated leaf is exposed to light and then tested with iodine for starch. Which result is most likely?
White regions show more starch because they reflect more light
Green regions show more starch because they contain chlorophyll for photosynthesis
Every region shows equal starch because chlorophyll moves around the leaf
Neither region contains starch because leaves only store proteins
14. After the tip of a young shoot is pruned, several side shoots begin growing strongly. What best explains this change?
Pruning converts lateral buds into roots
Removing the shoot tip reduces apical dominance, allowing lateral buds to grow
Cutting the stem makes xylem transport sugars instead of water
The side shoots grow because photosynthesis stops in the remaining leaves
15. Why are stomata found mainly on the lower surface of many terrestrial plant leaves?
The lower surface receives more carbon dioxide from the soil
The shaded position generally helps limit water loss while permitting gas exchange
The lower surface produces more chlorophyll than the upper surface
Pollinators can reach stomata more easily there
16. A plant germinates and forms leaves in its first year, survives winter, then flowers and produces seeds in its second year before dying. How is it classified?
Biennial
Evergreen
Perennial
Annual