The structure of the C4 leaf shows how mesophyll cells hug the epidermis of the leaf. hug the bundle sheath cells. b. they are spikey. how there are stomata on the underside of the leaf. they store water. e. AJ b C e d
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- Closed stomata ________. a. limit gas exchange c. prevent photosynthesis b. permit water loss d. absorb lightChoose correct option and explain. A plant wilts when- a) sunlight is not available and the rate of photosynthesis slows down. b) the mycorrhizae among its roots have "stolen" too much water from the plant. c) it is sad. d) turgor pressure in cells' central vacuoles is high. e) turgor pressure in cells' central vacuoles is lowStomata are usually opena. at night, when the plant requires a supply of oxygen.b. during the day, when the plant requires a supply of carbondioxide.c. day or night if there is excess water in the soil.d. during the day, when transpiration occurs.e. Both b and d are correct.
- Radical vascular bundles are those in which: A. xylem is surrounded by phloem B. phloem is surrounded by xylem C. xylem and phloem occur on the same radius D. xylem and phloem occur on the different radiiRootsa. are the primary site of photosynthesis.b. give rise to new leaves and flowers.c. have a thick cuticle to protect the epidermis.d. absorb water and nutrients.e. contain spores.Is water primarily pushed or pulled up the plant? A. Push B. Pulled Water transpires primarily from? A. Only open stomata B. Entire leaf surface C. All stomata
- What substances plug wounded sieve-tube elements, thereby preventingthe leakage of phloem sap?a. X protein and callose b. C protein and callose c. P protein and callose d. P protein and sucrose e. none of the aboveGuttation in plants is due to condensation of water vapor and occurs through the hydathodes. D. Disagree, because guttation occurs through the stomates. A. Agree, because guttation occurs through the hydathodes. B. Disagree, because it is root pressure that causes guttation. C. Agree, because during night time, water condenses due to drop in temperature.Which of the following statements is/are FALSE for CAM plants? a.The dark reaction uses less ATP and NADPH than other plants. b.Succulents and tropical plants growing under semi-arid condition. c.C4 pathway occurs at night and C3 pathway occurs at daytime. d.Scotoactive stomata are open during daytime but close at nighttime.
- Which cells are responsible for the movement of photosynthates through a plant? a. tracheids, vessel elements b. tracheids, companion cells c. vessel elements, companion cells d. sieve-tube elements, companion cellsChoose the best answer for following question. Gases, such as CO2, enter the leaf through:a. stomata. c. the mesophyllb. bundle sheath cells d. the phloemMinerals dissolved in watera. enter root epidermal cells by active transport.b. take an extracellular pathway through roots to thevascular cylinders.c. are transported up through phloem to the leaves.d. enter root cortex cells by diffusion.
