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Seeds and Fruits Types & Dispersal copyright cmassengale.

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Presentation on theme: "Seeds and Fruits Types & Dispersal copyright cmassengale."— Presentation transcript:

1 Seeds and Fruits Types & Dispersal copyright cmassengale

2 Seeds and Fruit Fruits are formed by seed plants to aid in dispersing seeds A seed contains the developing plant embryo in a protective coat (testa) Seeds form from ovules fertilized in the ovary Ovaries with seeds ripen into dry or fleshy fruits copyright cmassengale

3 Parts of a Seed External seed coat or testa Developing plant embryo Stored food called endosperm Seeds may be in one part (monocot) or two parts (dicots) MONOCOT DICOT copyright cmassengale

4 Parts of a Seed copyright cmassengale

5 Gymnosperm Seed A single fertilization produces the diploid (2n) embryo The food source is the haploid megagametophyte copyright cmassengale

6 Flowering plant seed In angiosperms (flowering plants) there is DOUBLE _______________ Which produces a diploid ________(2n) and, A triploid (3n) __________ Endosperm is the food source copyright cmassengale

7 Dicot vs. monocot seed Dicot has two cotyledons (like bean) Endosperm (food) is kept in the _________ Monocot has one __________ which absorbs the endosperm tissue during germination (corn) copyright cmassengale

8 Fruit In flowering plants – Fruit is a mature, ripened o_____ that contains the seeds Pericarp – the ovary wall ovary Fruit types A. Simple B. Aggregate C. Multiple copyright cmassengale

9 A. Simple fruit A. Simple fruit – develops from a ______ ovary of a single flower. Simple fruits can be either fleshy or dry when mature Simple fleshy fruit 1. __________ 2. _________ copyright cmassengale

10 Simple fleshy fruit 1. Berry – entire fruit wall is soft and fleshy at maturity. Inside is slimy. For example, grapes, tomato, etc. 2. _______________ is a berry with tough, leathery rind (peel) Examples: oranges, lemons, other citrus. copyright cmassengale

11 Simple fleshy fruit: drupe 3. _______ type – outer part of fruit wall is soft and fleshy, inner part is hard and stony For example: ______________________ copyright cmassengale

12 Simple fleshy fruit: pepo 4. ________ – also a fleshy fruit with a tougher outer rind All member of the squash family: pumpkin, melons, cucumbers copyright cmassengale

13 Simple fleshy fruit: pome 5. Pomes: most of the fleshy part of pomes develops from the enlarged base of the perianth (corolla and calyx) that has fused with the ovary wall Pomes include ___________________ copyright cmassengale

14 Simple dry fruit: capsule Simple dry fruits are dry (not fleshy) at maturity. Simple dry fruits that open at maturity include: capsules and legumes Capsule – fruit is dry at maturity and splits open along several seams Example: Cotton copyright cmassengale

15 Simple dry fruit: Legumes Legumes are dry at maturity and split open along _______ seams Examples: pea pods, bean pods, peanut copyright cmassengale

16 Simple dry fruits Simple dry fruits that do NOT open at maturity include Caryopsis: seed coat is fused to the ovary wall (cereal grains like ____________________) Nuts: single-ovary wall and seed coat remain separate, ovary wall is very hard (acorns) copyright cmassengale

17 B. _____________ __________ fruit develops from one flower with many separate pistils/carpels, all ripening simultaneously Examples: strawberry, raspberries, blackberries copyright cmassengale

18 C. Multiple fruit Multiple fruit develops from ovaries of several flowers borne/fused together on the same stalk For example: ____________ copyright cmassengale

19 What is the purpose of the fruit? The main function of the fruit is to disperse the seeds Dispersal is important because 1. It spreads the progeny in order to colonize new environments 2. Reduces ______________ for resources with parents 3. Reduces the chances of predators destroying all of the plant’s yearly seed production Four types of seed dispersal: A. Self dispersal B. ______ dispersal C. Water dispersal D. _______ dispersal copyright cmassengale

20 A. Self dispersal Plants disperse their seeds by forceful ejection – explosive fruits! Witch hazel, squirting cucumber (jet propulsion) copyright cmassengale

21 Self dispersal The peanut plant sows (buries) its own seeds! Geocarpic: carpel grows inside the earth (soil) copyright cmassengale

22 B. Wind dispersal Fruit and seeds may have special devices for wind dispersal Plumes catch wind currents: Dandelion Trees take advantage of their great heights for wind dispersal. Fruits with wings are used to slow the descent to land: maple, ash fruit copyright cmassengale

23 C. ___________ Dispersal Fruits and/or seeds use flotation devices to travel by water (in rivers, oceans, etc.) Fruit may have air spaces and corky floats: for example ________________ copyright cmassengale

24 D. Animal dispersal Plants have _____________ with animals to accomplish seed dispersal Many plants depend on animals for seed dispersal; they may offer a nutritional reward Animals learn to recognize ripened fruit colors Fleshy fruits eaten and dispersed with feces copyright cmassengale

25 Animal dispersal Some dry fruit attach and cling to animals (they hitchhike on the animals) Some have Velcro-like hooks that cling to animal fur (burdock, cockleburs) Others have sticky substances that stick to host (mistletoe) copyright cmassengale

26 Further Study on Seed Dispersal What carries the dandelion seeds for miles? What feature of trees gives them a particular advantage when dispersing seeds by air? How does the squirting cucumber disperse its seeds? Although plants use wind and water, what do most plants use as carriers for their seeds? Blackberries on a tree do not ripen simultaneously, why? What plant do elephants help to disperse? How do they do it? What percentage of these seeds germinate in elephant dung? Why? copyright cmassengale


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