Concept explainers
To determine:
The tissue in which it is expected to find the radioactive material immediately after exposure to the labeled carbon and during transport if a scientist has exposed a leaf to
Concept introduction:
Phloem sap is the organic compound consisting sugars, amino acids, hormones, enzymes water and minerals. The sugar is mostly dissolved carbohydrates like sucrose. It is synthesized at source part of the plant. The source parts of the plant are capable of synthesizing sugars in the presence of sunlight by the process of photosynthesis. The photosynthetic cells present in leaves are capable of photosynthesis. Thus, phloem cells originate in the photosynthetic cells only.
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Biology: Concepts and Investigations
- Under what conditions does plant tissue experience lack of oxygen? How is ATP generated from glucose without oxygen?arrow_forwardPlant roots are adapted as storage organ( such as potatoes and carrots)Typically photosynthesize during the summer and remain dormant underground during winter. Explain how sugar transport in such a plant would be different during summer, when the plant is photosynthesizing and in the spring when new growth is coming uparrow_forwardWhich of the following membrane activities requires energy from ATP hydrolysis? O transport of oxygen through the phospholipid layer water uptake of plants from roots to shoots O absorption of dissolved nutrients in the small intestine O movement of water using aquaporinarrow_forward
- The loss of water from a plant by transpiration cools the leaf. Movement of water in transpiration requires both adhesion to the conducting walls and wood fibers of the plant and cohesion of the molecules to each other. A scientist wanted to increase the rate of transpiration of a crop species to extend its range into warmer climates. The scientist substituted a nonpolar solution with an atomic mass similar to that of water for hydrating the plants. What do you expect the scientist's data will indicate from this experiment? The rate of transpiration will be the same for both water and the nonpolar substance. Transpiration rates will fall to zero as nonpolar compounds do not have the properties necessary for adhesion and cohesion. Transpiration rates will increase as nonpolar compounds undergo adhesion and cohesion with wood fibers more readily than water. The rate of transpiration will be slightly lower with the nonpolar substance as the plant will not have evolved with the nonpolar…arrow_forwardWhich of the following happens in presence of toxin that causes outer chloroplast membrane to be less permeable to H2O? increase in amount of O2 produced decreased O2 produced carbohydrate synthesis in chloroplast would increase cytoplasm of plant cells would become hypertonic synthesis of ATP in chloroplast would increasearrow_forwardThe warmth of hot flowers attracts pollinators and helps broadcast the flowers’ (often foul) scent. Corpse flower stalks can reach 98°F, as warm as our bodies. The heat and foul odor both occur in pulses produced by the central stalk. How do these flowers get so hot? Amorphophallus and other heatproducing flowers have evolved mechanisms that disconnect cellular respiration from ATP synthesis. In most cells, cellular respiration uses about 40% of the energy in glucose to synthesize ATP, with the rest given off as heat (see Chapter 8). Hot flowers, on the other hand, synthesize very little ATP; instead, almost all of the energy in glucose is released as heat, causing the flower to warm up. Besides the promise of carrion, what other features have flowers evolved that attract animal pollinators?arrow_forward
- In winter, plants exchange the saturated lipids in their membranes for unsaturated lipids. Unsaturated lipids are "bent" and keep the membranes more fluids because they cannot be stacked closlely together. Of what advantage would this be for herbaceous plants that live through the winter? (Hint: what happens to bacon grease or the grease on top of soup when you put it in the refrigerator?)arrow_forwardWhich of the following membrane activities requires energy from ATP hydrolysis? Group of answer choices water uptake of plants from roots to shoots movement of water using aquaporin absorption of dissolved nutrients in the small intestine transport of oxygen through the phospholipid layerarrow_forwardA flask containing an aquatic plant in water is placed next to a light. A sensor that detects the amount of dissolved oxygen is placed in the flask, and the light is set on a timer to run on a 12-hour-light, 12-hour-dark cycle for 48 hours. Explain how the amount of dissolved oxygen will change in the flask during the 12-hour-light cycle Support your explanation using information about the processes that are occurring in the flask.Explain how the amount of dissolved oxygen will change in the flask during the 12-hour-dark cycle. Support your explanation using information about the processes that are occurring in the flask.arrow_forward
- In farming communities, there is a concern that over irrigation can leech nutrients out of the soil, flood a farm area, and add salt to the soil in a process called salinization. The overall negative results are that some plants cannot germinate (grow from seed) and other adult or growing plants will die. Explain what is happening on the cell level, in regards to transport across the cell membrane, why seeds might not germinate, and why adult plants might die.arrow_forwardPlant leaves contain openings called stomata, which allow the diffusion of ?arrow_forwardA stoma (plural: stomata) is a tiny pore found on the underside of a leaf. When open, carbon dioxide can diffuse from the atmosphere, where it is present at approximately Catm= 0.70 mg/L, between the L = 5 μm thick guard cells, into the relatively well mixed air cavity within each stoma, and from the cavity into cells that consume it during photosynthesis. What is the mass flux of carbon dioxide into an open stoma that has a cross-sectional area of A = 2 μm2, a diffusion coefficient of D = 0.16 cm2/s, and a steady air cavity concentration of Cs = 0.04 mg/L?arrow_forward
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