Concept explainers
To determine: The role of plasmodesmata in the movement of nutrients through a plant root.
Introduction: In a multicellular organism, cells are linked to each other by specialized structures called cell junctions. Plant cells are connected to each other by middle lamella and plasmodesmata. Plasmodesmata are defined as passageways or pores between cell walls of adjacent cells that can be opened or closed. When opened, they allow the direct diffusion of ions, water and molecules between the cytosols of adjacent cells. The plasma membrane of one cell is continuous with the plasma membrane of an adjacent cell at these pores. The smooth endoplasmic reticulum from one cell is connected to that of the adjacent cell through a central tubule known as desmotubule.
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EBK BIOLOGY
- EXPERIMENT : INITIATION OF CALLUS AND CELL SUSPENSION IN SELECTED PLANTS OBJECTIVES : To prepare plant materials as a source of explants. To initiate callus in solid media and cell suspension from selected plant materials. QUESTIONPlease give a general introduction about this experiment.arrow_forward*True/false* 1-The lack of thylakoid membrane in the plastids make it prone to form an irregular shape ? 2-CPA toxicity can be minimized by reducing the concentration and altering the cooling rate? 3-Sperm cell sexing is a powerful biotechnological tool that translate into generation of revenue? 4- Differences in excitation and emission rates requires variable microscopic light intensity to visualise florescent ? 5- molecules transport in or out the nuclear pores depend in phosphorus level? 6-paternal imprinting genes are characterized by silencing the maternal gen? 7- the number of bubbles introduced on the cell freezing straw can be increased to 4? 8- Paternally inherited genomic imprinting irregularities are associated with certain genetic diseases?arrow_forwardExercise II Bryophyta: The Mosses Examine with the dissecting microscope the mosses that are available. The "leafy" plants are the gametophytes and any elongated structures growing above them are the sporophytes. (See text Figure 16-27, page 385.) 15. Label the following in Figure 5 below: spores, zygote, protonema, gametophyte, meiosis, female, male, sporophyte, archegonia, sperm, sporangium. Capsule (n) 9 "Bud" Mature (2n) Female (n) 1n 2n Young sporophyte (2n) gametophyte (n) 82 Antheridia gametophyte (n) Embryo (2n) water E88 Female -gametophyte (n) sperm Fertilization (2n) Figure 5. Moss Life Cycle (drawn by Stephanie Preising, SCSU '20) Obtain a gametophyte and observe its symmetry, its leaf like structures, its axis (pseudo- stem), and is rhizoids. Some species of mosses are unisexual; others are bisexual. The moss gametophyte originates as budlike structures that develop from a protonema (plural: protonemata), a system of branching filaments derived from a germinating spore.arrow_forward
- Exercise II Bryophyta: The Mosses de Examine with the dissecting microscope the mosses that are available. The "leafy" plants are the gametophytes and any elongated structures growing above them are the sporophytes. (See text Figure 16-27, page 385.) 15. Label the following in Figure 5 below: spores, zygote, protonema, gametophyte, meiosis, female, male, sporophyte, archegonia, sperm, sporangium. € Capsule (n) Mature (2n) Female (n) 1n 2n Young sporophyte (2n) gametophyte (n) Antheridia gametophyte (n) 82 Embryo (2n) water Egg Female, gametophyte (n) sperm Fertilization (2n) Figure 5. Moss Life Cycle (drawn by Stephanie Preising, SCSU '20) Obtain a gametophyte and observe its symmetry, its leaf like structures, its axis (pseudo- stem), and is rhizoids. Some species of mosses are unisexual; others are bisexual. The moss gametophyte originates as budlike structures that develop from a protonema (plural: protonemata), a system of branching filaments derived from a germinating spore.arrow_forwardQ16arrow_forwardExercise 2: Construct an indented dichotomous key on the following groups of plants: Bryophyta Lower Vasuclar plants Higher Vascular plants Gymnosperms Angiosperms Pteridophyta Equisetophytaarrow_forward
- Q9: select the best answer that appliesarrow_forwardSAMSUNG SCBIO124-Biology1-A X + qo2tZnoiFPc7w0Gpr1VyRRMpNInM/view QUESTION 1 Water potential is the pressure exerted by freely moving water molecules in a system. Describe the relationship between water potential with solute potential and pressure potential in plants. Plant cell P has a solute potential of-350 kPa and a pressure potential of 200 kPa. Besides, is plant cell Q which has a solute potential of -500 kPa and a pressure potential of 200 kPa. Determine the direction of net movement of water between the two cells by using the water potential equation. Explain the characteristics of water that make it such an important medium for life. If an athlete was heavily perspiring after an intense match game, suggest one type of replacement drink (with explanation) that he should take between hypertonic, isotonic and hypotonic drink to recover himself. 3:41 AM 81°F C ) ENG 14/8/2021arrow_forwardAnswer questionarrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning