Plant Biology Quiz

Question 1In an experiment, a shoot grows from 18 mm to 42 mm in 6 days. Find its mean growth rate in mm/day, rounded to two decimals.

Enter a number in mm/day.

Answers within 0.005 mm/day of the expected value are accepted.

Question 2A growing plant gains dry mass while the soil loses little mass. What supplies most of the new carbon?

Light particles remaining as the carbon in cell wallsWater molecules supplying the carbon atomsMineral grains converted directly into the plant’s sugarsCarbon dioxide incorporated into organic compounds

Question 3Water evaporates from a leaf connected to continuous xylem columns. What helps draw replacement water upward?

A downward push from the atmosphere that lifts each moleculeSucrose manufactured by the empty vessel wallsCohesion linking molecules into a column under tensionAn animal-like muscular pump inside the stem

Question 4A developing fruit receives sugars from mature leaves. Which description fits the phloem connection?

Pressure-driven movement between a source and a sinkTransport of mineral grains through dead sugar-producing cellsMovement determined solely by which organ is lowestA fixed downward route that excludes growing fruit

Question 5Stomata close during dry conditions. What trade-off follows directly?

A conversion of leaf minerals into a replacement water supplyUnchanged exchange because gases pass through closed openingsReduced vapor loss at the cost of more limited gas exchangeIncreased gas exchange because closed pores attract molecules

Question 6A young shoot curves toward one-sided light as its shaded side lengthens faster. Which mechanism explains the bending?

A joint rotated by muscles attached to the shoot tipA difference in cell expansion coordinated by growth signalsA shortening of the shaded side that pushes the tip forwardA conscious choice made by a brain inside the growing bud

Question 7Pollen arrives on a stigma, but a mature seed does not form. Which stage distinction prevents an incorrect conclusion?

Seed failure proves that the flower received no pollenContact with the stigma creates a mature seed immediatelyPollen arrival establishes that an embryo has completed growthDelivery of pollen differs from successful fertilization and development

Question 8An organism absorbs the products of external digestion and has chitin-containing walls. Which classification fits?

A fungus with a different nutritional strategy from plantsA photosynthetic leaf supplying sugar through chloroplastsA plant defined by its dependence on organic food from soilA seed whose cellulose walls have become animal tissue

Question 9After darkness begins, living plant cells still have sugar and oxygen available. Which process continues to supply usable cellular energy?

Light-dependent reactions powered by the absence of sunlightConversion of mineral salts into photons inside the mitochondriaRespiration linking the breakdown of organic molecules to ATPA complete shutdown of metabolism until daylight returns

Question 10A growth trial varies water supply, light, and fertilizer together. Which change would make a claim about water more informative?

Change the fertilizer whenever a watered plant grows slowlyHold the other conditions comparable and replicate independent plantsMeasure one unusually large plant instead of the treatment groupsAssign a different species to each watering treatment

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Plant Biology Quiz

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