What is fertilization in plants?

The joining of pollen and egg cells in the flower's ovary

The movement of pollen from anther to stigma

The production of nectar by flowers

The growth of petals on a flower

Why might seeds have hooks or spines?

To stick to animals for dispersal

How do animals help with seed dispersal?

By eating fruits and dropping seeds elsewhere

What is seed dispersal?

When seeds are spread away from the parent plant

Which characteristic helps seeds disperse by wind?

Being light with hairs or wings

Flowering plants and pollination

A symbiosis (SIM-bie-OH-sis) is a close, long-term relationship between two organisms. Three examples of symbiotic relation- ships include: parasitism, mutualism, and commensalism. Parasitism (PAR-uh-SIET-IZ-UHM) is a relationship in which one indi- vidual is harmed while the other individual benefits. Mutualism (MYOO-choo-uhl-IZ-uhm) is a relationship in which both organisms derive some benefit. In commensalism (kuh-MEN-suhl-IZ-uhm), one organism benefits, but the other organism is neither helped nor harmed. Parasitism Parasitism is similar to predation in that one organism, called the host, is harmed and the other organism, called the parasite, benefits. However, unlike many forms of predation, parasitism usually does not result in the immediate death of the host. Generally, the parasite feeds on the host for a long time rather than kills it. Parasites such as aphids, lice, leeches, fleas, ticks, and mosquitoes that remain on the outside of their host are called ectoparasites. Parasites that live inside the host’s body are called endoparasites. Familiar endoparasites are heart- worms, disease-causing protists, and tapeworms, such as the one shown in Figure 20-5. Natural selection favors adaptations that allow a parasite to exploit its host efficiently. Parasites are usually specialized anatomically and physiologically for a par- asitic lifestyle. Parasites can have a strong negative impact on the health and reproduction of the host. Consequently, hosts have evolved a variety of defenses against parasites. Skin is an important defense that prevents most parasites from entering the body. Tears, saliva, and mucus defend openings through which parasites could pass, such as the eyes, mouth, and nose. Finally, the cells of the immune system may attack para- sites that get past these defenses. parasite from the Latin word parasitus, meaning “one who eats at the table of another” Word Roots and Origins Tapeworms are endoparasites that can grow to 20 m or greater in length. Tapeworms are so specialized for a parasitic lifestyle that they do not have a digestive system. They live in the host’s small intestine and absorb nutrients directly through their skin. Tapeworms reproduce by producing egg-filled chambers, which are released in their host’s feces to be unknowingly picked up by a future host. FIGURE 20-5 Copyright © by Holt, Rinehart and Winston. All rights reserved. 404 CHAPTER 20 Mutualism Mutualism is a relationship in which two species derive some benefit from each other. Some mutualistic relation- ships are so close that neither species can survive without the other. An example of mutualism, shown in Figure 20-6, involves ants and some species of Acacia plants. The ants nest inside the acacia’s large thorns and receive food from the acacia. In turn, the ants protect the acacia from herbi- vores and cut back competing vegetation. Pollination is one of the most important mutualistic rela- tionships on Earth. Animals such as bees, butterflies, flies, beetles, bats, and birds that carry pollen between flowering plants are called pollinators. A flower is a lure for pollina- tors, which are attracted by the flower’s color, pattern, shape, or scent. The plant usually provides food—in the form of nectar or pollen—for its pollinators. As a pollinator feeds in a flower, it picks up a load of pollen, which it may then carry to other flowers of the same species. Commensalism Commensalism is an interaction in which one species benefits and the other species is not affected. Species that scavenge for leftover food items are often considered commensal species. However, a relationship that appears to be commensalism may simply be mutu- alism in which the mutual benefits are not apparent. An example of a commensal relationship is the relationship between cattle egrets and Cape buffaloes in Tanzania. The birds feed on small animals such as insects and lizards that are forced out of their hiding places by the movement of the buffaloes through the grass. Occasionally, the cattle egrets also feed on ectoparasites from the hide of the buffaloes, but the buffaloes gen- erally do not benefit from the presence of the egrets.

Flowering plants and seed dispersal

PLANT PROPAGATION Plant propagation is the process of creating new plants. There are two types of propagation: sexual and asexual. Sexual reproduction is the union of the pollen and egg, drawing from the genes of two parents to create a new, third individual. Sexual propagation involves the floral parts of a plant. Asexual propagation involves taking a part of one parent plant and causing it to regenerate itself into a new plant. The resulting new plant is genetically identical to its parent. Asexual propagation involves the vegetative parts of a plant: stems, roots, or leaves. (Sorensen, 2019) ANGIOSPERMS: MONOCOTYLEDON & DICOTYLEDON The angiosperms or flowering plants are divided into two groups: monocots and dicots. Monocots have one seed leaf while dicots have two. Monocots have leaves with parallel veins while netted veins for dicots. SEED BEARING PLANTS ANGIOSPERMS & GYMNOSPERMS Seed-bearing plants could be angiosperm or flowering or gymnosperm which are non-flowering plants. The angiosperms are plants that have flowers and produce seeds enclosed within a carpel. The angiosperms are a large group and include herbaceous plants, shrubs, grasses, and most trees. Their seeds may contain one seed leaf or monocotyledon and when there are two they are dicotyledons. The gymnosperms on the other hand are seed-producing plants known as "naked seeds" like cycads, conifers, and pines. The learning materials provided below will give you comprehensive information on the difference between angiosperms and gymnosperms. SEED BEARING PLANTS The other classification of plants is what we call seed-bearing plants or vascular plants. These plants reproduce through their seeds. Most fruits and vegetables that you love to eat are seed-bearing plants. Looking at the diagram below, seed-bearing plants could be gymnosperms or non-flowering plants and angiosperms or flowering plants. The angiosperms are classified too according to the number of seed leaves: monocotyledon and dicotyledon.

Flowering plants coordination and response

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