Explain the difference between tap root, tuber, and bulb. Give an example of each.?
A tap root system is a root system that contains a larger, primary root from which smaller roots branch off. Tap roots are capable of growing very deep, which is good for plants that grow in an environment in which there is a dry season, the tap root can access deeper soil levels to obtain the necessary water to maintain metabolism. Tap roots systems, being capable of growing deep into the soil provide the necessary anchoring support to very large plants. Although tap root systems are often times deeper than fibrous root systems, they can often be very shallow. For example, conifers that grow in very mountainous, alpine environments often times produce very shallow roots because of the lack of soil. Fibrous root systems which are usually pretty shallow cans be very deep. A tuber is a modified portion of a plant stem used to store starch to support the plant during times when environmental conditions become unfavorable to support photosynthesis. A potato is an example of a tuber. A bulb is similar to a tuber in that it is also a modified portion of the stem used to store resources. The main difference being that the bulb stores materials in fleshy leaves. An example of a bulb is an onion.
What is the difference between sensory neuron and a motor neuron?
These fundamental members of the nervous system also vary with respect to their functions.Sensory neurons carry signals from the outer parts of your body (periphery) into the central nervous system.Motor neurons (motoneurons) carry signals from the central nervous system to the outer parts (muscles, skin, glands) of your body.Interneurons connect various neurons within the brain and spinal cord.What is the difference between Sensory and Motor Neurons?• Sensory neurons bring sensory impulse from sensory organs to the central nervous system, whereas motor neurons carry motor impulses from the central nervous system to specific effectors.• Sensory neurons are situated in the dorsal root ganglion of the spinal nerve, whereas motor neurons are situated in the ventral root ganglion of the spinal cord.• Sensory neurons follow afferent pathways while motor neurons follow efferent pathways.• An average adult has about 10 million sensory neurons and half a million of motor neurons.• Motor neurons are multipolar, and sensory neurons are unipolar.• Sensory neuron has afferent fiber, whereas motor neuron has efferent fiber.• Motor neurons do not generate commands to communicate with muscles, but receive from sensory neurons.
What is the difference of primary and secondary growth in plants?
Primary growth happens in primary meristems and secondary growth accordingly in secondary meristems. Primary growth refers to longitudinal growth of the shoot and of the roots.Plant growth occurs through cell division and cell expansion. Cell division mainly occurs in the meristems which are undifferentiated cells. With regard to the secondary growth, also called secondary thickening, the diameter of the shoot and the roots is increased.Secondary growth is only possible in dicots, most monocots lack secondary growth because of the absence of cambium located between xylem and phloem.
What will be the effect on diameter on newton's ring if air is replaced by water?
Newton's ring experiment mainly contains following questions…Q.What are Newton’s Rings?A.Alternate dark and bright rings formed due to presence of air film when plano convex lens is placed on glass plate is called newtons rings.Q.How are Newton’s rings formed?A.They are formed as a result of interference between light waves reflected from the upper and lower surfaces of the air film developed between the convex surface of plano convex lens and plane glass plate.Q.Why are they circular?A.This is so because the air film formed is wedge shaped and loci of points of equal thickness are circles concentric with point of contact.Q.what is the function of the 45° inclined glass plate?A.It turns the light rays coming from an extended source to ninety degrees and so the rays fall normally on the plano convex lens.Q.Why do rings get closer as their order increases?A.The diameter of dark rings is proportional to the square root of natural numbers while bright rings are proportional to the square root of odd natural numbers hence the don’t increase at the same rate.Q.Why is the center of the ring dark?A.At the point of contact the path difference is zero but one of the rays is reflected so the effective path difference becomes λ/2 thus the condition of minimum intensity is created hence it is a dark spot.Q.What if the glass plate is replaced with plane mirror?A.Then we will not get interference fringe because the intensity of light reflected from mirror will be so great that it won’t be visible and we will get uniform illumination.Q.What if sodium light is replaced with white light?A.Few colored fringes will be observed near the center.Q.What will happen if we replace the lens with plane glass?A.Then interference will take place but the shape of the rings will be irregular.Q.What will happen if water is introduced between the lens and glass?A.The diameter of the rings will decrease because the diameter of the rings is inversely proportional to the refractive index.Q.What will happen if we use a lens of small radius of curvature?A.Then the rings will be of smaller diameter and there is chance of error while taking the readings.Q.What if a plane glass making some angle with the glass stripe is used in place of lens?A.Then we will have dark and bright fringes in shape of a line. Newtons ring experimentTried to mention all the important questions asked in this topic!!!Cheers:)
Find the Diameter? Explain or show work..Please.?
vol = pi (r^2) h 706.9 = pi (r^2) 9 pi (r^2) = 706.9/9 = 78.5444 r^2 = 78.5444/pi = 25 r = sqrt(25) r = 5 since the radius is 5, and the diameter is 2 times the radius, then the diameter = 10
What causes the increase in diameter of an old woody dicot stem?
Growth in the diameter of a tree is due to the development of a vascular cambium which produces new xylem to the inside and smaller amounts of phloem to the outside. In addition a cork cambium produces new bark and the older bark and phloem is crushed.
How does the diameter of the rings vary in Newton's rings experiment?
Newton’s rings are formed due to interference between the light waves reflected from the top and bottom surfaces of the air film formed between the lens and glass sheet. An air film of varying thickness is formed between the lens and the glass sheet.The diameter of dark rings is proportional to the square root of natural numbers while bright rings are proportional to the square root of odd natural numbers hence the don’t increase at the same rate.
How do trees carry water from their roots to the leaves at the top? Do the mechanics change for large trees like giant redwoods? Could this be imitated for carrying water without pumps?
Upward water transport in trees occurs in cells known collectively as xylem. These include tubelike cells called tracheids and vessel elements. These join together to form vertically oriented tubes reaching from the roots to the leaves. Two forces combine to move water upward in these tubes: root pressure and transpiration. Root pressure occurs when water flows into the roots through osmosis due to differences in the concentration of solutes between the soil and roots. This higher pressure in the roots exerts a slight upward force on the fluid column. Transpiration occurs when water evaporates from leaf surfaces, causing a lower pressure in the leaves. This also exerts a slight upward force on the fluid column. The xylem conduits are small diameter and act as capillaries; the adhesion of liquid to the inner capillary walls counteracts gravity and keeps the water column from falling. The slight upward forces of root pressure and transpirational pull are enough to move the fluid upward.There are minor variations on this among the vascular plants, and the physical limits to capillary action and the magnitude of the various forces are what limit potential height growth of trees. If anything causes a gap in the water column (cavitation), the system can break down and the flow stops.Pressure from below is already used in many places to move water for human use. Natural springs or wells drilled into aquifers under pressure are quite common in rural areas for moving water without pumps. Suction from above is the basis for most pumping systems. Creating a pump that relied on negative pressure created by evaporation is certainly possible, but wildly inefficient. Trees use the water for photosynthesis as it passes through the leaves, but evaporate far more molecules of water through their leaf stoma than they use in the photosynthetic process. Using evaporation to transport water for human use would mean that most of your water would be lost to the atmosphere. I like the concept of using capillary action by building well pipes as a collection of very small vessels. While the adherence of water to the vessel walls would reduce the upward force needed by a pump, it would also decrease the speed with which water could be drawn through the pipe.
Diameter of a circle when area is 1257?
A circle's area is described by the formula A = pi * r^2. So if we're given an area of 1257, we can simply plug away: 1257 = pi * r^2. Let's divide both sides by pi. 1257 / pi = r^2. Let's get a decent decimal approximation for the left-hand side. 400.116 = r^2. Let's take the square root of both sides. 20.003 = r So our radius is just a little bit more than 20. We know that the diameter is twice the radius, so the diameter is 40.006, or a little bit more than 40. For question 2: you can simply work backwards. Say that you have a circle of radius of s that has an area 9 times bigger than a circle of radius r: 9A = pi s^2 = 9 pi r^2 so s^2 = 9 r^2, and taking square roots of both sides: s = 3r. So we see that if we increase r by a factor of 3, we're increasing the area by a factor of its square, 9.