Essays on Phloem

1. Agiosperm wood has vessels as compared to conifers wood. Vessels can be defined as cells stacked end to end. Water is able to flow freely among them and otherwise vessels are called pores. However, conifers wood has resin canals that should not be confused with pores though they might look a little similar. Conifers wood is sometimes referred to as gymnosperms. 2. A. It is a part of sapwood. B. It is monocot. C. Monocots have inside their seed coats one seed leaf while dicots have two. Monocots’ leaves are thin due to the fact that the endosperm ...

Mountain pine beetle (MPB) (Dendroctonus ponderosae Hopkins) is a bark beetle that lays eggs within the vascular system of the mature trees of lodgepole pine (Pinus contorta). First known epidemic infestation was recorded in 1994 in the forests of British Columbia (BC). Prior to 1994, the infestation was negligible, owing to the fact that extreme low temperatures of winter killed the beetle, thereby curbing the problem. In the past two decades, however, due to global warming the winter temperatures are not low enough to kill the beetle. This has escalated the problem of deforestation and thereby has unbalanced the ...

Lesson 5 Answers:

24.) Plants are classified into four major groups: Bryophytes, Pteridophytes, Gymnosperms and lastly the Angiosperms. Bryophytes are the plants that do not have true vascular systems, which consist of the xylem and the phloem. In this group, includes the mosses, liverworts and hornworts. Together, they are considered as land plants that reproduce their own asexually by producing spores. Spores are produced in the ‘sporangium’ (plural sporangia), a bulb-like structure located at the top of the stalk. It can only be seen through the use of high powered microscope. Because they lack vessels that can bring the nutrients from the roots ...

Question 1: If flowers give rise to fruits then what are the functions of showy flowers? If flowers are not showy, than how do they accomplish what a showy flower accomplishes? Showy flowers function to attract to attract pollinators. According to Thornhill and Gangestad (89), showy flowers are specialized structures (selected male adaptations) that increase the male mating success by attracting the pollinators. Non-showy flowers rely on different mechanisms for pollination such as wind. Question 2: Why are the cotyledons in the bean seeding somewhat shriveled up and not as fleshy as they were in the seed? ...

Introduction

Like any other class of organisms, aphids have their own adaptation to feeding. This can be easily deduced from their high precision in determining host plants from non-host plants. In this class, the mouthparts of insects are adapted to the various feeding modes which range from chewing to sucking. In our case of study, aphids have mouth parts which are highly adapted to sucking from plant phloem.

Theory of the experiment

Aphids are insects that can be a nightmare to farmers since they can become a perennial pest highly reducing the returns of the farmer. They are sucking insects which pierce through the plants and ...

Describe the process of transpiration in vascular plants

Similar to other living organisms, plants possess the capacity to regulate their internal atmosphere. Vascular plants scientifically known as tracheophytes possess conducting tissue which offers independence from a wet or dry environment. These plants have a multifaceted structure of tubes known as the vascular system to carry water and other important solutes. Phloem moves all through the plant as it conveys biological solutes in aqueous states in all direction. Reliant on the period and the plant's requirements, phloem can even alter its flow course.

Xylem originates at the root running via the stems and concludes at small pores known as stomata ...