Hope it helps you...
The Government of Pakistan is a federal government ..Plz mark it as Brainlist
length of train = 500 metre
speed of train = 15 metre per second in east direction
speed of bird = 10 metre per second in west direction
=> vr = vt + vb
=> vr = 10 + 15
=> vr = 25 metre per second
now we know that
speed = distance \ time
so time = distance \ speed
=> time = 500 \ 25
=> time = 20 seconds
bird will cross train in 20 seconds
in plants, parenchyma is one of three types of ground tissue. ground tissue is that is not vascular tissue or part of the dermis (skin) of the plant. in contrast to collenchyma and sclerenchyma cells, parenchyma cells primarily consists of all of the simple, walled, undifferentiated cells form a large majority of many plant tissues.
parenchyma cells are notable for their walls, and for being alive at maturity. collenchyma cells tend to develop secondary cell walls, to support structure. sclerenchyma cells get both walls and die off at maturity, producing tissues like bark and vascular tissue. the parenchyma cells have walls and stay alive at maturity. makes them less useful in structural applications, the cells can move and store water and nutrients as well as divide quickly. is important for the growth and repair functions of the parenchyma cells.
each parenchyma cell may be a different shape, depending on its exact location and tissue it is present in. however, it will always have a large central vacuole. organelle is responsible for storing water and ions. both creates a pressure between the parenchyma cells and their neighbors (called turgor pressure) and also allows the plant to store enormous amounts of water and nutrients. the walls of the parenchyma cells also allow the easy passage of sugars created in the leaves.