Ahhhh … smell that fresh air. That’s the smell of you on a walk in a park with your kids, naming the trees and flowers you pass, then explaining sexual versus asexual reproduction.
Parts of a plant cell: Cell wall; cell membrane; cytoplasm containing chloroplasts, chromoplasts, other organelles and the nucleus; a large vacuole containing water, sugar and other dissolved substances
Photosynthesis: The process plants use to make food. Steps: 1. Leaves, roots and stem take in water, sunlight and CO2. Chloroplasts in leaf cells contain chlorophyll which absorbs sun’s energy. Energy is used to combine H2O and CO2 to make carbohydrates and oxygen. Some of this can be stored as starch. The carbs and oxygen are then used to release energy, CO2 and water. At night, there is only respiration using stored energy. In daytime, photosynthesis is faster than respiration, so more energy is stored.
Roots: network of string-like structures (fibrous roots) or tap roots (like carrots). Absorb water, nutrients, anchors the plant.
Parts of a root: Primary root; secondary roots; root hairs; root cap
Types of roots: Fibrous roots (many equal-sized primary roots); advetitious roots (roots that grow out of the stem, like the hairs on an onion bulb); aerial roots (as in ivy); prop roots (for trees)
Stems: Transports nutrients; include trucks, vines, central points of grass
Parts of a stem: Buds (small growth that becomes a new shoot or a flower); shoots (new stems that grow off the main stem); main stem
Leaves: Food-making parts of plants. Leaves have veins and holes on their undersides to let in water and air. These can open and close. Note that leaves include pine needles.
Vascular tissue: Carries food and water through the plant
Bark: Dead protective tissue on the outside of a tree. Bark is formed in a living layer underneath the current layer after that layer gets pushed out by the new rings that are forming. It has tiny raised openings that provide oxygen and CO2 exchange, and it protects the tree from disease and helps hold in moisture. Since it can’t grow, it peels off and new bark is formed underneath.
Heartwood: The oldest rings of the tree; can’t transport water anymore
Sapwood: The newer rings; still transport water
Annual ring:A single layer of secondary thickening in an older plant, which takes one year to form
Seed: Has an embryo, food supply and protective coat. Seedlings grown in the dark are different from those grown in the light. Grow taller to seek light, but are weaker structurally. Seed gets energy from storage, not sun, but shoots require sun.
Flowers: Enable reproduction by containing male and female sex cells (gametes). Parts: petals that produce nectar to attract insects needed for pollination; stamens (the male part which contain pollen); and the carpel or pisitil (the female part that contains ovules in their ovary and can trap pollen). Some plants have male and female parts in all their flowers. Others have flowers of each type, and others have only male or female flowers, and need to be cross-pollinated with another plant of their genus or species.
Fruit: The part of the flowering plant that holds the seeds. This includes nuts, succulent fruits, berries, pods (like pea pods), kernels (like wheat kernels) and more.
Cones: The part of conifer trees that hold the seeds. They start out open, then after pollination, close up. When the seeds are ripe and the weather is warm and dry, the scales open and drop the fertilized seeds so they can find dirt to grow in. The cones then remain on the plant for a year or so. Note that conifers have male and female flowers and self-pollinate. Seeds are dispersed through animal excrement, wind, water and catching on animal fur.
Asexual reproduction: Reproduction that doesn’t involve a male and female sex cell. Algae, ferns and mosses do this because they don’t have flowers. But some use spores to reproduce also, alternating sexual and asexual reproduction.
Vegetative reproduction/vegetative propagation: When a plant can reproduce itself by itself asexually. Examples: plants that grow from bulbs (like tulips), from runners (like strawberries), from tubers (like potatoes), from cuttings and even from just a few cells (as in a lab). Note that for growing from cuttings, the cutting might need to stand in water and grow roots first before being planted in dirt.
Reproductive structures of plants: Flowers, cones, and spore capsules. Divisions (phylums) are made in the plant kingdom according to the form of the reproductive structures.
Anthers: male part of reproductive structrues; produce pollen
Ovaries: female part of flower – contains eggs that get pollinated by anthers, grows into the fruit, with each egg a seed.
Pollination: The transfer of pollen from the male part of a plant to the female part of the plant
Growth season: One year of a plant’s life
Plant lifecycle types: Annuals (die out except the seed each year); biennials (die in two years); herbaceous perennials (roots live many years but above ground parts die each year); woody perennials (most of parts above and below ground live on); ephemerals (very short lifecycles)
Dormant: Still alive but not actively growing; a seed. To see if a seed is still alive, try to grow it.
Germination: The waking up of a dormant seed
Soil: Dirt that is suitable for plant growth
Tropism: A plant “sense”
Autotropism: The ability (as of a plant) to make one’s own food
Geotropism: The ability (as of a plant) to sense gravity. Plants grow away from gravity, even if the soil is upside-down.
Phototropism: The ability (as of a plant) to sense light.
Thigmotropism: The ability (as of a plant) to sense touch.
Deciduous tree: Tree that loses its leaves each year
Evergreen tree: Tree that doesn’t shed its leaves all at once. They have tough, waxy leaves that don’t lose as much water.
Fungi: Not plants, but plant-like. Grow in damp and dark. No chlorophyll, so feed on dead or living things. Inc: mold, yeast, mushrooms. Some are helpful, as yeast and cheese mold. Some are poisonous to animals and plants.T
Angiosperm: Plant that produce flowers
Hydrophyte: Plant that grow in water. Include algae, seaweed, lily pads and more
Waterlogged: Oversaturated with water. Water-holding capacity is better for rich soil but poorer for sandy soil.
Aeration: The air flow to plant roots. Roots need oxygen, though plants take in CO2 and give off oxygen. Leaves transport sugar but can’t transport oxygen.
Drought: An extended dry period
Erosion: Bare soil exposed to elements. Prevent it by maintaining a vegetation cover. Erosion lowers soil quality since topsoil is richest.
Soil management: Maintaining proper balance of soil nutrients, airflow and water in soil
Soil conservation: Erosion prevention
Crop rotation: Rotating crops in order to balance the mineral levels in the soil since plants use and add different amounts of various minerals as they grow
Parts of an animal cell: Cell membrane (no cell wall like plants have); cytoplasm; organelles, including mitrochondria, which convert substances into energy for the cell, vacuoles, which house fats and liquids, the nucleus, which controls everything that happens in the cell, and the Golgi complex, which stores and distributes the substances that are made inside the cell (the warehouse). Cell also has centrioles, ribosomes to build proteins, and lysosomes. Note: See a picture of cell division to view these stages. Also note that different cells specialize according to their job.
Tissue: Cells of the same type combined together to do a particular job
Organ: Tissues of different types working together to do a particular job
System: Organs of different types working together to do a particular job
Body structures of animals: Most have a fluid-filled cavity and a skeleton to hold the cavity in place and allow for movement. All have an outer layer to enclose their bodies, which can be skin, an exoskeleton, a cuticle, scales, shells, prickles, fur and more. Animals also have a part or parts of the body to provide for locomotion, such as fins, flippers, wings, legs, etc.
Biped: Animal with two legs
Quadraped: Animal with four legs
Vertebrate: Animal with a backbone
Invertebrate: Animal with no backbone (as a snail)
Arthropod: Animal with an external skeleton/ exoskeleton (as a grasshopper)
Warm-blooded animal: Animal that can regulate its body temperature
Cold-blooded animal: Animal whose temperature changes with its environment
Herbivore: An animal that eats only plants
Carnivore: An animal that eats only meat
Omnivore: An animal that eats both plants and meat
Types of animal communication: Body language, such as preening or dancing; making noises, such as using vocal cords or rubbing body parts together; sending out chemical messages through pheremones or by spraying; and changing color.
Parts that animals use to sense their environment: Eyes; ears; specialized body parts for sensing balance; specialized body parts for sensing water pressure and currents; whiskers; tentacles; taste buds; parts for detecting electric pulses given off by other creatures (sharks do this). Note that birds may be able to sense Earth’s magnetic field and use it for migration, too. Also, animals detect gravity.
Types of animal reproduction: Animals either lay eggs (before or after fertilization) or give birth to live young
Larva: The form some animals take before beginning metamorphosis
Pupa: A hard shell that forms on larva inside of which metamorphosis occurs
Metamorphosis: The total restructuring of an animal’s body, sometimes inside a pupa or cocoon
Hibernation: A period of inactivity in some animals that includes the slowing of the metabolism
Migration: The large-scale movement of a species from one place to another
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