02:49Nitrogen Fixation - Seven Wonders of the Microbe World (4/7)OpenLearn from The Open University120
Multiple ChoiceIn root nodules, the plants provide __________, and the bacteria provide __________. 121
Multiple ChoiceLegumes (members of the pea family) have roots with swellings called nodules that __________. 183
Multiple ChoiceWhich of these describes the initial interaction between Rhizobium and a soybean root? 91
Multiple ChoiceThe enzyme complex that catalyzes the conversion of atmospheric nitrogen to ammonia is __________. 191
Multiple ChoiceThe most abundant gas in our atmosphere cannot be used by plants directly in its atmospheric form. Fortunately, this gas is made available to some plants by certain bacteria that live symbiotically in their roots. What is this gas? 235
Multiple ChoiceBy trapping insects, carnivorous plants obtain __________, which they need __________. 309
Textbook QuestionMycorrhizae enhance plant nutrition mainly by a. absorbing water and minerals through the fungal hyphae. b. providing sugar to root cells, which have no chloroplasts. c. converting atmospheric nitrogen to ammonia. d. enabling the roots to parasitize neighboring plants.531Has a video solution.
Textbook QuestionWhich of the following activities of soil bacteria does not contribute to creating usable nitrogen supplies for plant use? a. the fixation of atmospheric nitrogen b. the conversion of ammonium ions to nitrate ions c. the decomposition of dead animals d. the assembly of amino acids into proteins176Has a video solution.
Textbook QuestionEpiphytes are a. fungi that attack plants. b. fungi that form mutualistic associations with roots. c. nonphotosynthetic parasitic plants. d. plants that grow on other plants.193Has a video solution.
Textbook QuestionBy trapping insects, carnivorous plants obtain ___________, which they need ___________ . (Choose the best answer.) a. water ... because they live in dry soil b. nitrogen ... to make sugar c. phosphorus ... to make protein d. nitrogen ... to make protein169Has a video solution.
Textbook QuestionThe greatest difference in health between two groups of plants of the same species, one group with mycorrhizae and one group without mycorrhizae, would be in an environment a. where nitrogen-fixing bacteria are abundant. b. that has soil with poor drainage. c. that has hot summers and cold winters. d. in which the soil is relatively deficient in mineral nutrients.201Has a video solution.
Textbook QuestionCertain types of fungi cause diseases in plants. There are a variety of antifungal sprays that can be used to control this problem. Some gardeners constantly spray their plants with fungicides, even when no signs of disease are evident. How might this be disadvantageous to the plant?133Has a video solution.
Textbook QuestionThe specific relationship between a legume and its mutualistic Rhizobium strain probably depends on a. each legume having a chemical dialogue with a fungus. b. each Rhizobium strain having a form of nitrogenase that works only in the appropriate legume host. c. each legume being found where the soil has only the Rhizobium specific to that legume. d. specific recognition between chemical signals and signal receptors of the Rhizobium strain and legume species.214Has a video solution.
Textbook QuestionDesign an experiment, using radioactive carbon and the heavy isotope of nitrogen (15N2), that would test whether the rhizobia–pea plant interaction is mutualistic.95Has a video solution.
Textbook QuestionThe allele of the human transport protein associated with lighter skin is found almost exclusively in people with European ancestry. The other common allele for darker skin, which appears to be the ancestral allele, is found in people with African ancestry. What is a plausible explanation for how the lighter-skin allele came to be so common in those with European ancestry?264Has a video solution.
Textbook QuestionThe carnivorous plant Nepenthes bicalcarata ('fanged pitcher plant') has a unique relationship with a species of ant—Camponotus schmitzi ('diving ant'). The diving ants are not digested by the pitcher plants, but instead live on the plants and consume nectar. Diving ants also dive into the digestive juices in the pitcher, swim to the bottom, and capture and consume trapped insects, leaving uneaten body parts and ant feces behind. What nutritional impact do the ants have on fanged pitcher plants? Do the pitcher plants derive any nutritional benefit from this relationship? Nitrogen is a key nutrient often obtained by carnivorous plants from the insects they digest. Are the results presented here what would be expected if nitrogen is a limiting nutrient? Explain.169Has a video solution.
Textbook QuestionThe carnivorous plant Nepenthes bicalcarata ('fanged pitcher plant') has a unique relationship with a species of ant—Camponotus schmitzi ('diving ant'). The diving ants are not digested by the pitcher plants, but instead live on the plants and consume nectar. Diving ants also dive into the digestive juices in the pitcher, swim to the bottom, and capture and consume trapped insects, leaving uneaten body parts and ant feces behind. What nutritional impact do the ants have on fanged pitcher plants? Do the pitcher plants derive any nutritional benefit from this relationship? Carnivorous plants and legumes (e.g., peas, soybeans) both absorb key nutrients directly from other organisms. How is nutrient acquisition in pitcher plants similar to that in legumes? How is it different?122Has a video solution.
