Botany Practice Test — Easy Level

A free 10-question Botany practice test for Science Olympiad, written at invitational level. Every question and answer choice is listed below — correct answers and scoring are revealed when you take the timed test.

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Medium (10 questions)

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1. Which characteristic is most typical of a monocot angiosperm rather than a dicot (eudicot)?

A.A) Net-like (reticulate) leaf venation
B.B) Vascular bundles arranged in a ring in the stem
C.C) Flower parts commonly in multiples of three
D.D) Presence of a dominant taproot system

2. A student sets up two identical potted bean plants. Plant 1 has its leaves coated lightly with petroleum jelly on both surfaces. Plant 2 is left uncoated. Both receive the same light, water, and soil. After three days, Plant 1’s leaves look slightly wilted, while Plant 2 looks normal. Which process was MOST directly reduced in Plant 1, leading to this result?

A.A) Transpiration through stomata
B.B) Root hair formation
C.C) Photosynthesis in chloroplasts
D.D) Nitrogen fixation in the soil

3. A plant leaf fixes 0.60 moles of CO₂ during photosynthesis. Assuming all of this CO₂ is used to make glucose according to the equation 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, approximately how many grams of glucose are produced? (Molar mass of glucose ≈ 180 g/mol)

A.A) 3.0 g
B.B) 6.0 g
C.C) 12.0 g
D.D) 18.0 g

4. The tiny extensions of root epidermal cells that greatly increase the surface area for absorption of water and minerals are called:

A.A) Root hairs
B.B) Lateral roots
C.C) Root caps
D.D) Cortex cells

5. An aquatic plant is placed under a lamp in a beaker of water. A student counts oxygen bubbles released per minute as a simple measure of photosynthesis rate. Trial 1: Lamp 10 cm from plant → 30 bubbles/min Trial 2: Lamp 30 cm from plant → 10 bubbles/min All other conditions are kept the same. Which is the BEST conclusion from these data?

A.A) Increasing light intensity increases the rate of photosynthesis up to a point
B.B) Distance from the lamp has no effect; the results are due only to random error
C.C) Photosynthesis does not depend on light, only on carbon dioxide levels
D.D) Oxygen production is controlled only by root absorption, not by leaf exposure to light

6. In a homosporous fern, one diploid sporophyte produces 400 haploid spores. Each spore grows into a gametophyte that produces 8 eggs. Assuming all eggs could potentially be fertilized, how many diploid zygotes could be formed at most in the next sporophyte generation?

A.A) 50 zygotes
B.B) 400 zygotes
C.C) 800 zygotes
D.D) 3200 zygotes

7. Which plant group correctly matches its dominant generation in the alternation of generations life cycle?

A.A) Bryophytes – sporophyte dominant
B.B) Ferns – gametophyte dominant
C.C) Gymnosperms – sporophyte dominant
D.D) Angiosperms – gametophyte dominant

8. A student wants to test the effect of auxin on root development in plant cuttings. They take 20 identical stem cuttings from the same plant species and place each in moist soil. What is the BEST way to set up the experiment to test auxin’s effect?

A.A) Dip 10 cuttings in auxin solution and 10 in plain water, then compare the number of roots formed
B.B) Dip all 20 cuttings in auxin solution and compare them to healthy, rooted plants
C.C) Place 10 cuttings in bright light and 10 in dim light, all dipped in auxin solution
D.D) Water 10 cuttings with fertilizer and 10 with plain water, all without auxin

9. A potted plant placed near a window bends so that its stem grows toward the light source. This response is primarily controlled by which plant hormone and process?

A.A) Auxin causing cell elongation on the shaded side (phototropism)
B.B) Ethylene causing faster cell division on the lit side (photoperiodism)
C.C) Gibberellins causing uniform stem elongation (gravitropism)
D.D) Abscisic acid causing stomatal closure on the lit side (thigmotropism)

10. A farmer in a hot, dry region must choose between planting two grass crop varieties. Variety X is a typical C₃ plant, and Variety Y is a C₄ plant similar to corn. Both will receive limited irrigation. Based on their physiology, which variety is MOST likely to maintain higher photosynthesis and yield under these conditions, and why?

A.A) Variety X, because C₃ plants always fix more CO₂ than C₄ plants
B.B) Variety X, because C₃ plants keep stomata more open to cool the leaves
C.C) Variety Y, because C₄ plants concentrate CO₂ and reduce photorespiration in hot conditions
D.D) Variety Y, because C₄ plants only photosynthesize at night and avoid water loss