S EED P LANTS Gymnosperms & Angiosperms. W HAT IS A SEED ? A seed contains an embryonic sporophyte...
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Transcript of S EED P LANTS Gymnosperms & Angiosperms. W HAT IS A SEED ? A seed contains an embryonic sporophyte...
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SEED PLANTSGymnosperms & Angiosperms
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WHAT IS A SEED? A seed contains an embryonic sporophyte Has a protective coat and enough nutrients
to support the sporophyte until it is ready to germinate
Seeds differ depending on their mode of species dispersal… eg. wind, animals, water etc.
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GYMNOSPERM = “NAKED SEED”
Seeds are uncovered or “naked”
They are often exposed on the surface of scales or cones
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ANGIOSPERM SEEDS
How are angiosperms different from gymnosperm seeds?
Seeds are covered by a fruit
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SEED PLANT LIFE CYCLE
Seed germinates into a sporophyte Sporophyte produces megaspores and
microspores by meiosis Spores develop into megagametophytes and
microgametophytes Fertilization takes place A seed is formed
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SEED PLANT LIFE CYCLE
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TWO TYPES OF GAMETES Microspores
Develops into a microgametophyte
In seed plants this is the POLLEN grain
Megaspores Develops into a
megagametophyte In seed plants this is the
EMBRYO sac
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GYMNOSPERMS
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GYMNOSPERMS
Includes: Cycads, Gingko, Conifers and Gnetophytes
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GYMNOSPERMS ADAPTATIONS TO LAND….. Seeds → allow for species dispersal on land Needles (or scales) → maintain water balance in
dry cold climates Vascular tissue → transport nutrients and water
from surroundings throughout the plant (xylem and phloem)
Pollen → can be transported by wind, animals or insects for fertilization
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OTHER ADAPTATIONS….. Largest group of gymnosperms are the conifers
(“evergreens”) Needle / scale-like leaves which remain all year Sporophyte (2N) generation is dominant Cell wall is strengthened with lignin
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POLLINATION AND FERTILIZATION Pollination
• pollen grains are released from microsporangium in the male cones in spring • pollen grain with its sperm nucleus is carried by the wind to the female cone • pollen grains are captured on a sticky substance near the egg and ovule (female gametophyte)
Fertilization • pollen grain land near ovule, forms a pollen tube that grows down into the ovule carrying the sperm nuclei of the pollen grain • sperm nuclei fertilizes egg (N) zygote (2N)develops into a seed (2N) • next year the seed (which contains the embryo, stored food, and a seed coat) is released from the female cone
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IN GYMNOSPERMS
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ECOLOGICAL IMPORTANCE OF GYMNOSPERMS
Provide food and shelter for a variety of animals
Extensive roots prevent erosion by absorbing water
Maintain level of O2 and CO2 in the biosphere Roots have mycorrhizae (mutualistic
relationship) which help conifers obtain nutrients from the soil and fungi benefit with products of photosynthesis
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ECONOMIC IMPORTANCE OF GYMNOSPERMS
Pulp for paper and paper products Lumber Provide products such as turpentine and
varnish Medicines such as taxol from yew tree Food source from seeds and stems, clothing
from bark
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FOR TOMORROW
Bring a gymnosperm sample in for tomorrow. Complete the gymnosperm package.
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ANGIOSPERMS
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ANGIOSPERMS
An exceptionally large and successful group of plants
Includes: All deciduous trees All broad leafed evergreen
trees All non-woody plants such as
grasses, garden plants, flowering plants
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SOME EXAMPLES OF ANGIOSPERMS
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FLOWER STRUCTURE Microspores & megaspore are produced within
flowers Sepal
Green beneath the petals, protects the developing flower Petals
Attract pollinators Pistil
Vase like structurs in the centre of the flower, has 3 parts: stigma, style & ovary Stigma is an enlarged, sticky knob at the top of the pistil
(sticks to pollen) Style is the stalk between the stigma and the ovary Ovary is the enlarged base containing ovules
Stamens Grouped around the pistil, has 2 parts: filament and the
anther Anther has 2 pollen sacs Filament attaches the pollen sac to the flower
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FLOWER STRUCTURE
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IN ANGIOSPERMS
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TWO GROUPS OF ANGIOSPERMSDICOTYLDONS & MONOCOTYLDONS
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MONOCOTS
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DICOTS
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ASSIGNMENT Prepare a summary chart comparing
angiosperms and gymnosperms
Gymnosperms Angiosperms
General Characteristics
Life Cycle and Reproductive Structures
Adaptations & Unique Characteristics
Examples & Classification