1. The main advantage of hydroponics in nutrient research is that a) it excludes
ID: 147767 • Letter: 1
Question
1. The main advantage of hydroponics in nutrient research is that a) it excludes hydrogen ions. b) it is simply a "cleaner" experimental system without any "dirt" involved. c) in water, the plant does not need and other molecules beyond carbon dioxide. d) plant growth can be maximized since the minimal supply of water is never a problem. e) nutrient measurements can be made accurately because in a liquid solution they are not isolated in soil a few millimeters away from a root hair. 2. Which element is Not one of the three most common ones in plants? a) oxygen b) sulfur c) carbon d) hydrogen 3. Soil formation is due to a) decomposition of organic matter. b) weathering or transport of bedrock. c) activity of animals such as earthworms. d) All of the above change the nature of soil. 4. Soil consists of a) a mixture of soil particles of different sizes. b) decaying organic material. c) All of these are components that define soil. 5. The plasma membrane of plant cells a) actively transport water into the cell. b) allows the entry of all minerals equally. c) actively transports some mineral ions into the cell. 6. Which statement is Not true about root adaptations in plants? a) Some plants have a very poorly developed roots or none at all. b) Fungal mycorrhizae depend on plants for the fungus's supply of water and minerals. c) Some plants, including orchids, require the presence of fungal symbionts to survive. d) Parasitic plants have root adaptations called haustoria that draw nutrients from the host. e) Bacteria of the genus Rhizobium live in root nodules in legumes, producing available nitrogen that the plant uses. 7. Girdling is a process by which a) plants carry water upward. b) plants carry nutrients upward. c) plants carry nutrients downward. d) a tree is killed by interrupting the passage of phloem sap. e) a tree is killed by interrupting the passage of xylem sap 8. Which statement is Not true about water uptake in a plant root? a) Water enters the root by osmosis from the soil. b) Water enters the cytoplasm of the root hairs by active transport. c) Water travels by diffusion through the cell walls of the epidermis and cortex. d) Water must enter the cytoplasm of the endodermal cells to get past the Casparian strip. 9. If you cut a herbaceous stem and observe fluids continually seeping upward and out of the cut, it is most likely to be due to a) root pressure d) tension caused by transpiration c) active transport by phloem e) cohesion to the xylem walls b) turgor pressureExplanation / Answer
1) THE MAIN ADVANTAGE OF HYDROPONICS IS IT CAN BE DONE IN A MINIMAL SUPPLY OF WATER.
and the nutrients can be measured accordingly in a controlled amount at any given stage by mixing them in water.
only 10% water is required for this compared to the tranditional methods. Thus within a small space and even in water limiting conditions one can grow and achieve ahigh yielding plant varieties.]
2)Sulfur
CARBON, HYDROGEN AND OXYGEN ARE THE PRINCIPLE REQUIREMENTS AND ARE ESSENTIAL FOR THE PLANTS WHILE SULPHUR IS A MACRONUTRIENT RREQUIRED FOR GROWTH.
3)Soil formation is due to all of the above
Soil formation is a stepwise process which requires weathering of rocks by environmental factor and natural processes followed by decomposition of organic matter by the activity of soil microorganisms such as earthworm.
4)Soil consist of mixture of all of the above
Soil comprises of not only weathered rocks, small particles, but also dead and decaying matter or organic matter which makes it nutrient rich to support the growth of plants.
5) Actively transports some minerals ions.
7)Girdling is the process by which a tree is killed by interrupting the flow of phloem sap.
In this process the bark is removed completely from the tree so the phloem layer carrying the food to roots is lying just below the bark will be damaged.
8) Water enters root cells by osmosis but water must enter the cytoplasm of endodermal cells to get past the casparian strips.
osmosis occurs because the movement of water is happening down the water potential . Root hairs are maintained at low water potential.
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