FOOD WEBS name A food chain is a simplified version of food web. In it organisms

ID: 197494 • Letter: F

Question

FOOD WEBS name A food chain is a simplified version of food web. In it organisms are assigned to different trophic levels Before you begin, define the following terms: 1. Biological community 2. Trophic level. 3. Autotroph 4. Heterotroph 5. producer 6. primary consumer 7. secondary consumer 8. tertiary consumer 9. quaternary consumer 10. Decomposer. 11. Food chain 12. Food webs. Answer the following questions 1. What is the relationship between a food chain and a food web? 2. What feature is characteristic of all organisms in trophic levels above the producers? 3. What would happen to an ecosystem if all the decomposers were removed? 4. Why quatenary consumers are quite rare?

Explanation / Answer

Define the following:

Seed: The fertilized ripened ovule of a flowering plant containing an embryo and capable of germination to produce a new plant. It is a propagative plant structure.

Sepal: It is a part of the flower of flowering plants which are usually green in color and function as protection for the flower in bud and as support for the petals when it blooms.

Petals: They are modified leaves, segments of the flower, typically colored that surrounds the reproductive organs. They are attached underneath the carpels and stamens and maybe separate or joined at the bases.

Pistil: The ovule bearing or seed bearing female organ of a flower that can be a single or group of fused carpels. They can be divided into the ovary, the style and the stigma.

Stigma: The sticky stem of the pistil of the female reproductive system in a plant. It is the portion of the ovary where the pollen germinates and is essential for the reproduction. Since it is sticky, it attracts and retains the pollen that falls upon it or brought by pollinators.

Style: It is a long, slender stalk that connects the stigma and the ovary.

Stamen: The male reproductive part is referred to as the stamen. It consists of the filament, the long sender stalk and anther at the tip.

Anther: Anther is the pollen bearing part at the upper end of the stamen. When pollen matures in the pollen sacs, the anther burst open to release the pollen.

Filament: The stalk-like structure of the stamen that attaches to the base of the flower and supports the anther.

Complete flower: A flower that consists of sepals, petals, stamens and pistils.

Incomplete flower: A flower that lacks at least one of the components that complete a flower, i.e, sepals, petals, stamens and pistils. The difference between complete and incomplete flower is structural in nature.

Perfect flower: A flower with male and female parts, i.e, the stamens and the carpels. It is also called bisexual in nature.

Imperfect flower: It is an unisexual plant that either lacks stamens or carpels.

Angiosperms

Gymnosperms

Flowering plants

Non-flowering plants

Seeds are enclosed within ovary

Seeds are unenclosed and found on scales, leaves

Lifecycle is seasonal

Lifecycle Is usually evergreen

Endosperm produced during triple fusion (triploid)

Endosperm produced before fertilization (haploid)

Reproductive system is present in flowers

Reproductive system is found in cones

Bisexual or unisexual

Unisexual

Cotyledons are present as monocots or dicots

Cotyledons are absent

The flowers of angiosperms offer nectar to both bats and birds.

Humans can enjoy almost every aspect of flowering plants. Their fragrances and colors are stimulating to the senses, they produce abundant food from most every part, and many flowering plants even have medicinal properties.