Biology & Life Science

Q: A houseplant placed in a window grows toward the source of light because auxin a. becomes more concentrated on the illuminated side of the plant. b. becomes more concentrated in the roots of the plant. c. becomes more concentrated on the nonilluminated side of the plant. d. inhibits the growth of cells on the shady side, so the cells on the sunny side grow faster. e. does none of these.

Q: Gravity-sensing mechanisms of many organisms are based on a. spicules. b. statoliths. c. uric acid crystals. d. sclereids. e. nematocysts.

Q: Downward bending of a seedling root can be blocked by a. moving it to a dark room. b. auxin transporters. c. auxin transport inhibitors. d. mutations in genes that code for auxin transport proteins. e. auxin transport inhibition and mutations in genes that code for auxin transport proteins.

Q: The primary root of a seedling grows down a. to avoid light. b. in response to gravity. c. because the cells on the upper surface of the root elongate more rapidly than those on the lower surface of the root. d. in response to different concentrations of auxin. e. because of all of these except "to avoid light."

Q: The plant hormone that promotes fruit ripening is a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.

Q: The gaseous plant hormone is a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.

Q: Which plant hormone has mostly inhibitory effects? a. auxin b. gibberellin c. cytokinin d. abscisic acid e. ethylene

Q: The plant hormone that promotes dormancy in some plants and seeds is a. abscisic acid. b. auxin. c. gibberellin. d. ethylene. e. none of these.

Q: Gibberellins have their most dramatic effects a. on leaves. b. in promoting abscission. c. on fruit ripening. d. on stem lengthening. e. on flowers.

Q: The plant hormone that promotes cell division in roots and shoots is a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.

Q: The polar transport of auxin in a plant a. creates an uneven distribution of the hormone. b. uses active membrane transporters to move auxin in and out of cells. c. uses membrane pumps to move hydrogen ions out of the cytoplasm into the primary cell wall. d. activates enzymes that loosen cross-links between cellulose microfibrils. e. does all of these.

Q: Auxin concentration gradients a. appear once germination begins. b. promote the transcription of an enzyme that breaks down cytokinin. c. allow formation of plant parts in expected patterns. d. help young cells elongate so that shoots and roots lengthen. e. are described by all of these EXCEPT "appear once germination begins."

Q: Root formation in stem cuttings can be improved by the application of a. synthetic auxins. b. abscisic acid. c. salicylic acid. d. citric acid. e. nitric acid.

Q: Auxins are secreted by a. most tissues undergoing ripening. b. apical meristems of shoots. c. vascular tissues of stems and leaves. d. root caps. e. root cells in response to water stress.

Q: 2,4-D, a potent eudicot weed killer, is most likely a synthetic a. auxin. b. gibberellin. c. cytokinin. d. phytochrome. e. none of these.

Q: Synthetic auxins are used as a. pesticides. b. herbicides. c. fungicides. d. insecticides. e. all of these.

Q: Which of the following is mismatched? a. cytokinin; inhibits lateral root formation b. auxin; promotes cell elongation c. gibberellin; involved in phototropism and gravitropism d. abscisic acid; promotes stomatal closure e. ethylene; promotes leaf abscission

Q: Which of the following is false about plant hormones? a. They bind to receptors on target cells. b. Their mechanism of action is completely different from that of animal hormones. c. Signal transduction may influence a metabolic pathway. d. The plant response may depend on a change in gene expression. e. Their effect can be synergistic or antagonistic.

Q: Which of the following matches of plant hormone to agricultural application is INCORRECT? a. abscisic acid; becomes active when crops are subjected to drought b. ethylene; permits unripe fruit to be shipped without damage for later ripening at distribution centers c. synthetic auxins; stimulates corn stalks to elongate d. cytokinins; induces apples to ripen e. gibberellins; stimulates roses to bloom

Q: Which of the following is not an environmental cue for plants? a. Length of night. b. Temperature. c. Earth's magnetic field. d. Presence of pathogens. e. Gravity.

Q: Perhaps a plant's greatest liability is its inability to a. produce growth hormones. b. use aerobic respiration. c. move when conditions around it deteriorate. d. produce its own lipids and proteins. e. respond to dwindling supplies of nutrients and water.

Q: Which of the following do the Kuna suffer very little from? a. Hypertension. b. Yellow fever. c. Malaria. d. Dengue fever. e. They suffer little from any of these.

Q: Which of the following is found in cocoa? a. Epicatechin. b. Caffeine. c. Resveratrol. d. Curcumin. e. Nicotine.

Q: Fleshy fruits with hard seed coats, such as cherries, are more likely to be dispersed by ____ than by other means. a. wind b. adhering to animal fur c. passing through animal guts d. falling to the ground, rotting, and releasing their seeds e. water currents

Q: The seeds of fleshy fruits are most likely to be spread by a. animals. b. water. c. wind. d. propulsion from the plant. e. none of these.

Q: Which of the following is NOT a category of fruit? a. complex b. simple c. aggregate d. multiple e. dry

Q: Which of the following is an incorrect match? a. pea pods; dehiscent b. strawberry; berry c. cherry; drupe d. corn; indehiscent e. tomato; berry

Q: What kind of fruit is formed from the fusion of individually pollinated flowers? a. aggregate b. simple c. multiple d. fleshy e. dry

Q: The shoot tip is indicated by a. A. b. B. c. C. d. D. e. E.

Q: The root tip is indicated by a. A. b. B. c. C. d. D. e. E.

Q: A cotyledon is indicated by a. A. b. B. c. C. d. D. e. E.

Q: The seed is produced by the maturation of the a. embryo. b. ovule. c. ovary. d. zygote. e. pollen.

Q: A pollen grain "knows" when to germinate due to which of the following? a. differentiation upon contact with the flower b. exposure to moisture c. cell signaling pathways d. electromagnetic impulses from the flower e. none of these

Q: A pollen grain coat is composed of which of the following? a. sporopollenin b. cellulose c. peptidoglycan d. exopolysaccharides e. none of these

Q: The endosperm of a plant a. is the food supply for the new sporophyte plant. b. is composed of haploid tissue. c. protects the young embryo within a seed. d. provides a connection between the ovary of a flower and a developing seed. e. produces sperm cells.

Q: "Double fertilization" produces nutrient tissue by the union of a. two egg nuclei and one sperm nucleus. b. two sperm nuclei and one egg nucleus. c. two sperm nuclei and two egg nuclei. d. one sperm nucleus and endosperm mother cell nuclei. e. two sperm nuclei and one endosperm mother cell nucleus.

Q: Microspores are indicated by a. A. b. B. c. C. d. D. e. E.

Q: The mature male gametophyte is indicated by a. A. b. B. c. C. d. D. e. E.

Q: Sperm nuclei are indicated by a. A. b. B. c. C. d. D. e. E.

Q: Meiosis is indicated by a. A. b. B. c. C. d. D. e. E.

Q: The female gametophyte is the a. flower. b. ovule. c. embryo sac. d. carpel. e. ovary.

Q: The megaspore produces a plant with ____ cells. a. 2 b. 7 c. 8 d. 14 e. 16

Q: Which of the following is false? a. Flowers often exhibit coevolution with their pollinators. b. Seeds often exhibit coevolution with their disseminators. c. The pollen grain forms from a haploid microspore. d. Megaspores are part of the female gametophyte generation. e. Megaspores and microspores arise through mitosis.

Q: What do gametes, spores, and the gametophyte generation have in common? a. They are all diploid. b. They are all haploid. c. They are present in vascular plants only. d. They are all produced by meiosis. e. They have none of these in common.

Q: Which of the following choices represents the correct sequence? a. microspores >>> meiosis >>> gametophyte >>> sperm b. meiosis >>> microspores >>> gametophyte >>> sperm c. gametophyte >>> meiosis >>> megaspores >>> eggs d. meiosis >>> gametophyte >>> megaspores >>> eggs e. gametophyte >>> mitosis >>> megaspores >>> eggs

Q: Which of the following is NOT true concerning nectar? It is a. sucrose-rich. b. a dilute fluid. c. the only food for most butterflies. d. rich in vitamins and minerals. e. easy for pollinators to sip.

Q: About ____ percent of the 295,000 known species of flowering plants coevolved with animal pollinators. a. 50 b. 60 c. 70 d. 80 e. 90

Q: Which forms the outermost whorl of flower parts? a. sepals b. petals c. anthers d. carpels e. stamens

Q: The corolla is made up of a. sepals. b. petals. c. carpels. d. ovaries. e. anthers.

Q: The calyx is composed of a. petals. b. sepals. c. stigmas. d. ovules. e. anthers.

Q: A stamen is a. composed of a stigma, a style, and an ovary. b. the mature male gametophyte. c. the site where microspores are produced. d. part of the vegetative phase of an angiosperm. e. none of these.

Q: The letter "D" in the above figure represents the a. style. b. ovary. c. stigma. d. anther. e. filament.

Q: The letter "A" in the above figure represents the a. style. b. ovary. c. stigma. d. anther. e. filament.

Q: A flower forms from a. an ovary tissue that migrates from the root. b. stem cells that form tumor like growths. c. impregnated pollen grains. d. a modified branch called a receptacle. e. bark tissue.

Q: A sporophyte is a ____ plant body that grows by ____ from a ____. a. haploid; mitosis; spore b. diploid; mitosis; spore c. diploid; mitosis; fertilized egg d. diploid; meiosis; fertilized egg e. haploid; mitosis; fertilized egg

Q: Although, it is not known the exact cause of colony collapse disorder, all of the following EXCEPT ____ are contributing factors. a. acute paralysis virus b. parasites c. neonicotinoids d. herbicides e. all of these

Q: In the fall of 2006, which of the following pollinators started declining due to several factors? a. butterflies b. moths c. honeybees d. mosquitoes e. night feeding bats

Q: Seeds can be described as "a little plant in a box with its lunch". Which parts of the seed correspond to the elements of this description?

Q: Explain why flowers that attract flies are well-adapted to their pollinator?

Q: Are perfect flowers really perfect?

Q: Are flowering plants haploid-dominant or diploid-dominant?

Q: Many species of flowering plants reproduce asexually by __________.

Q: Eudicot embryos transfer nutrients from endosperm to their two __________.

Q: In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a zygote; the other fuses with the endosperm mother cell and gives rise to __________.

Q: __________ is the arrival of pollen grains on a receptive stigma.

Q: Mitosis and cytoplasmic division of a cell in an ovule produces four __________, one of which gives rise to the female gametophyte.

Q: Each __________ develops into a pollen grain.

Q: Coevolved pollinators receive __________, pollen, or another reward for visiting a flower.

Q: Ovules develop from a mass of __________ wall tissue inside carpels.

Q: Flowers consist of modified leaves (sepals, petals, __________, and __________ ) at the ends of specialized branches.

Q: Labeling. Receptacle

Q: Labeling. Filament

Q: Labeling. Stamen

Q: Labeling. Petal

1 2 3 … 333 Next »

Subjects