Biology Week 14- Plant Tissues

Day 1 | Day 2 | Day 3 | Lab | Weekly Quiz | Quizstar

  • Ground tissue
  • Parenchyma
  • Collenchyma
  • Sclerenchyma
  • Dermal tissue
  • Epidermis
  • Stomata
  • Guard cell
  • Cork
  • Vascular tissue
  • Xylem
  • Phloem
  • Meristem
  • Apical meristem
  • Lateral meristem
  • Vascular cambium
  • Cork cambium
  • Taproot
  • Fibrous root
  • Primary root
  • Adventitious root
  • Root cap
  • Root hairs
  • Herbaceous stem
  • Woody stem
  • Tree ring
  • Springwood
  • Summerwood
  • Heartwood
  • Sapwood
  • Petiole
  • Simple leaf
  • Compound leaf
  • Hormone
  • Auxin
  • Gibberellin
  • Ethylene
  • Cytokinin
  • Abscisic acid
  • Tropism
  • Phototropism
  • Thigmotropism
  • Gravitropism
  • Hydrotropism
  • Photoperiodism
  • Critical length

Plant Tissues:
groups of cells that perform a common function.
link to an Internet Website

click to find the answer to today's question What are the tallest trees in the world?

  1. Ground tissue system: ground tissue provides storage, metabolism, and support. plant tissue types




  2. Dermal tissue system: dermal tissue forms the outside covering of plants and provides protection.

    leaf stomata


    Stomata Cork: closely packed cells protecting a woody stem.

  3. Vascular tissue system: vascular tissue provides transport link to an Internet Websiteand support.

    the key points to useful information on this page

    Xylem: straw-like tubes conducting water and minerals upward in a plant.

    Water is moved to the tops of very tall trees by capillary action, the adhesion/cohesion of water, transpirational pull, and root pressure. The largest force (transpirational pull) results from the evaporation of water from the leaves at the top of the tree. A tree behaves like a big straw, as water moves out of the leaves at the top and water moves in at the roots to replace it. Capillary action (what holds the water together) is a consequence of the high surface tension of water due to hydrogen bonding. Theoretically this process could continue at a very great height, but in practical terms trees are restricted to a maximum of about 400 feet (California redwoods) because of the requirements of stability. Water has been measured traveling up the stems of some oak trees at a rate of 60 meters per hour.

    Phloem: straw-like tubes conducting food downward in a plant.

  4. Meristems: growing regions where cells divide.

    Apical meristem - located at the tips of stems and roots.

    Apical meristems produce growth in length, primary growth.
    Lateral meristem - located around the outer edge of stems and roots.
    Lateral meristems produce growth in circumference, secondary growth.

      Two types of lateral meristems:

      1. Vascular cambium - located between the xylem and phloem, it produces additional vascular tissues.
      2. Cork cambium - located outside the phloem, it produces the cork.

Day 1 Assignment - Plant Tissues
This assignment must be turned in by the beginning of class tomorrow to receive credit.
Scoring criterialink to a local webpage

  1. Name the 3 different types of plant tissue systems.
  2. Draw a diagram of a plant and label the location of each plant tissue.
  3. From the drawing above make an enlargement diagram of a cross section of a leaf and lable the parts (What is inside?)
  4. Write no less than a paragraph discussing meristematic growth of a plant or draw a diagram showing the process.
  5. Which of the ground tissues give plants its "woody" characteristics.
  6. What type of dermal tissue is responsible for regulating gases that pass in and out of a plant.
  7. California redwoods can be as much as 100 meters high. Explain how water gets to the top of these tall trees?
  8. How are vascular tissues related to a successful plant graft? link to an Internet Website

Day 2

click to find the answer to today's question What causes tree rings to form?

The 3 major plant parts:

Roots link to an Internet Websitelink to a local webpage anchor plant in ground, absorb water and minerals, and store food. root systems

Stems link to an Internet Websitelink to a local webpage support the plant, transport materials in the plant, and serve as a storage area. a woody twig

a fall leaf Leaves link to an Internet Websitelink to an Internet Websitelink to a local webpage are specialized for capturing sunlight for photosynthesis.

Day 3
click to find the answer to today's question What environmental stimulus causes plants
and tree leaves to begin to grow in the spring?

Hormones are organic compounds that are effective at very low concentrations. These chemicals are usually synthesized in one part of the plant and transported to another location. They interact with specific tissues to causes changes such as growth and fruit ripening. Because hormones stimulate or inhibit plant growth, they are referred to as growth regulators.

Five groups of plant hormones:

  (bio lab 294)
Tropisms: plant movement toward or away from an environmental stimulus.

  • Phototropism - a growth response to light. Solar tracking is the phototropism of leaves or flowers as they follow the sun's movement across the sky.
  • Thigmotropism - a growth response to contact with a solid object. Thigmotropism allows vines to climb. It is thought that an auxin or ethylene are involved in this response.
  • Gravitropism - a growth response to gravity. Roots are positively gravitropic, usually growing downward and stems are negatively gravitropic, usually growing upward. Auxins are probably responsible for this growth.
  • Chemotropism - a response to chemicals. The growth of a pollen tube is in response to chemicals produced produced by the plant ovary.
  • Hydrotropism - a response to water. Most plants have a positive response to water.

Photoperiodism: plant response to changes in the length of days and nights.

  • Critical length is the length of daylight above or below which a species of plant will flower.
  • Long-day plants flower only when exposed to day lengths longer than their critical length. These are usually late spring and early summer flowers.
  • Short-day plants flower only when exposed to day lengths shorter than their critical length. These are usually early spring and fall flowers.
  • Day-neutral plants are not affected by the length of days and nights.

Day 3 Assignment - Plant Tissues (Test Your Concept Understanding)

  1. What is the phototropic response of plant leaves to light?
  2. What type of tropism controls the growth of plant roots?
  3. Both auxins and cytokinins make plants grow bigger, but they do it in different ways. How do each of these plant hormones "regulate growth"?
  4. Which part of a plant to both auxins and gibberellins cause to grow?
  5. Why don't all species of plants produce flowers at the same time?
  6. Why do tree leaves change color link to an Internet Websitein the fall?

Research Links:

Biology Class










California redwoods are the tallest trees in the world, growing nearly 400 feet tall.










Xylem cells grow large in the spring when water is plentiful, but much smaller in the summer when there is less water. The visible difference in these spring and summer cells causes what we know as tree rings.










Plants and tree leaves begin to grow in the spring as a response to the increasing length of daylight hours.