Plant and Cells

Comprehensive vocabulary flashcards covering light and electron microscopy, slide preparation, cell biology and organelles, cellular respiration, seed germination, plant reproduction, flower anatomy, pollination types, seed dispersal methods, photosynthesis, leaf cross-sections, and leaf starch testing.

Light Microscope

An optical instrument that uses visible light and a system of lenses to magnify specimens that cannot be seen with the naked eye.

Eyepiece Lens (Ocular Lens)

The lens located at the top of the microscope where the user looks; it further magnifies the image produced by the objective lens by $10\times$.

Objective Lens

The lenses positioned closest to the specimen on a rotating nosepiece; typical school microscopes feature three powers: $5\times$, $10\times$, and $40\times$.

Stage

The flat horizontal platform on a microscope where the glass slide containing the specimen is placed for viewing.

Stage Clips

Metal clips attached to the stage used to secure the microscope slide firmly in place during observation.

Coarse Focus Knob

The larger adjustment wheel used to move the stage or lens rapidly to bring the specimen into rough focus.

Fine Focus Knob

The smaller adjustment knob used after the coarse focus to bring the specimen into sharp, precise focus.

Microscope Diaphragm

A rotating dial situated beneath the stage that regulates the amount of light from the light source reaching the specimen, making it brighter or darker.

Light Source

The lamp or mirror typically situated at the base of the microscope that provides illumination to view the specimen.

Base (Microscope)

The heavy bottom support of the microscope that rests on the bench to provide physical stability.

Arm or Neck (Microscope)

The central structural pillar used to carry the microscope while supporting the base underneath with the other hand.

Low Power Objective Lens

The shortest objective lens on a school microscope that provides the lowest magnification power, specifically $5\times$.

Total Magnification

The complete magnification of an observed image, calculated by multiplying the magnification of the eyepiece lens by the magnification of the objective lens.

High Power Total Magnification

The total magnification obtained using a $10\times$ eyepiece lens combined with a $40\times$ objective lens: $10 \times 40 = 400\times$.

Coverslip

A thin, transparent square of glass or plastic placed gently over a specimen on a microscope slide to protect the lens and flatten the specimen.

Slide Mounting (45-Degree Angle Technique)

The procedure of supporting a coverslip at a $45^\circ$ angle with tweezers and lowering it slowly onto the specimen to prevent trapping air bubbles.

Blotting (Microscopy)

The action of pressing a paper towel gently against the outer edge of a coverslip to absorb excess liquid or stain from the prepared slide.

Biological Drawing Rules

Scientific drawing conventions requiring a sharp pencil, large scale, clear bold lines, no shading or cross-hatching, a title with magnification and stain, and uncrossed label lines.

Magnification Formula

The mathematical equation used to calculate image magnification: $\text{Magnification} = \frac{\text{Size of image}}{\text{Actual size of object}}$.

Actual Size Formula

The rearranged formula used to determine the true size of a specimen under a microscope: $\text{Actual size} = \frac{\text{Size of image}}{\text{Magnification}}$.

Image Size Formula

The formula used to calculate the measured size of a magnified image: $\text{Image size} = \text{Magnification} \times \text{Actual size}$.

Resolution

The ability of an optical instrument to distinguish two close points as separate entities, producing a sharp, clear image showing fine detail.

Dye Technology (Staining)

The application of chemical stains like Iodine or Methylene Blue to transparent cell organelles to create contrast so internal structures become visible.

Electron Microscope

A microscope that utilizes beams of electrons in a vacuum instead of light, capable of achieving magnifications exceeding $500{,}000\times$ on dead specimens.

Transmission Electron Microscope (TEM)

The most common electron microscope with the highest resolution ($0.5\,\text{nm}$) that transmits electrons through thin specimen slices to reveal internal organelles.

Scanning Electron Microscope (SEM)

A type of electron microscope that scans electron beams over the surface of a specimen to produce detailed three-dimensional images of outer surface contours.

Light Microscope Resolution Limit

The minimum distance between two points that can be distinguished separately by a standard light microscope, which is $200\,\text{nm}$.

Electron Microscope Resolution Limit

The fine detail resolving capability of an electron microscope, reaching down to approximately $0.5\,\text{nm}$.

Seed Germination

The biological process whereby a dormant seed embryo absorbs water, activates its metabolism, and begins to grow into a seedling.

Seed-Raising Mix

A light soil blend containing pumice and essential nutrients specifically formulated to promote aeration and encourage seedling growth.

Moisture (Germination Requirement)

Water required by dormant seeds to activate embryonic biochemistry and trigger the metabolic reactions necessary for germination.

Temperature (Germination Requirement)

The warmth required for seeds to germinate, matching their ideal soil conditions, where warmer temperatures within tolerance speed up growth.

Sowing Seeds

The process of placing seeds into a moist growing medium at the recommended depth and lightly covering them with potting mix.

Seedling

A young, developing plant that has recently emerged from a germinated seed embryo.

Cell

The smallest structural and functional unit of all living organisms.

Unicellular Organism

A living organism that consists of only one independent cell carrying out all life functions, such as Paramecium or bacteria.

Multicellular Organism

An organism consisting of an organized network of many differentiated cells with specialized functions, such as humans containing 100 trillion cells.

Prokaryote

A simple organism lacking a true, membrane-bound nucleus and complex internal organelles, such as bacteria and cyanobacteria (derived from 'pro' meaning before and 'karyo' meaning nucleus).

Eukaryote

A complex organism whose cells possess a distinct, membrane-bound nucleus containing genetic material, such as plants, animals, fungi, and protists (from 'eu' meaning true and 'karyo' meaning nucleus).

Prokaryotes vs. Eukaryotes

The fundamental division of life distinguishing simple cells without a nucleus (bacteria, Archaea) from complex cells containing a defined nucleus and organelles (animals, plants, fungi, protists).

Nucleus

A membrane-bound structure inside eukaryotic cells that contains most of the cell's genetic material (DNA) and directs cellular activity.

Cytoplasm

The thick, jelly-like substance that fills the interior of all cells and provides the medium where most cellular metabolic reactions take place.

Cell Membrane

The flexible outer barrier of the cell that regulates the movement of substances entering and exiting the cell.

Cell Wall

A protective, rigid or flexible boundary located outside the cell membrane in plants and bacteria that provides shape and structural support.

Cellulose

The insoluble complex carbohydrate polymer that forms the structural building blocks of plant cell walls.

Chloroplast

A specialized organelle found within plant cells that contains chlorophyll and serves as the site where photosynthesis takes place.

Permanent Vacuole

A large fluid-filled compartment surrounded by a membrane found inside plant cells that stores cell sap and helps maintain cell turgidity.

Cellular Respiration

The biochemical process in cells that breaks down glucose in the presence of oxygen to generate ATP.

Adenosine Triphosphate (ATP)

The universal chemical energy currency of the cell used to power movement, protein synthesis, cell division, metabolism, and active transport.

Mitochondrion

The double-membrane bound organelle in eukaryotic cells where aerobic cellular respiration takes place to generate ATP.

Cristae

The folded internal extensions of the inner mitochondrial membrane that provide an increased surface area for respiration enzymes.

Mitochondrial Matrix

The fluid-filled space enclosed by the inner membrane of the mitochondrion containing enzymes and chemical substrates for cellular respiration.

Aerobic Respiration

Cellular respiration carried out in the presence of oxygen that produces large quantities of ATP more efficiently than anaerobic pathways.

Aerobic Respiration Word Equation

The chemical word representation of aerobic respiration: $\text{Glucose} + \text{Oxygen} \rightarrow \text{Carbon dioxide} + \text{Water} + \text{Energy (ATP)}$.

Aerobic Respiration Chemical Equation

The balanced formula for aerobic respiration: $\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{about } 38\text{ ATP}$.

MRS C GREN

The acronym identifying the essential life processes: Movement, Respiration, Sensitivity, Cells/Control, Growth, Reproduction, Excretion, and Nutrition.

Flower

The reproductive organ of flowering plants (angiosperms) specialized for sexual reproduction, pollination, and seed formation.

Petal

A floral organ that is frequently brightly coloured and scented to attract insect pollinators to the flower.

Sepal

Small, green, leaf-like structures at the base of the flower that protect the inner floral parts while developing inside the bud.

Receptacle

The thickened, modified base of a flower stem from which all parts of the flower grow and receive support.

Stamen

The male reproductive organ of a flower, consisting of the pollen-bearing anther and its supporting filament.

Anther

The terminal portion of the stamen that contains pollen sacs and produces male pollen grains containing sperm cells.

Filament

The slender, stalk-like structure of the stamen that holds up the anther in an optimal position for pollen release.

Carpel (Pistil)

The female reproductive organ of a flower, comprising the stigma, style, and ovary containing ovules.

Stigma

The sticky, receptive surface situated at the top of the carpel specialized for capturing incoming pollen grains.

Style

The elongated neck or column connecting the stigma to the ovary through which the pollen tube grows.

Ovary (Flower)

The swollen basal chamber of the carpel that encloses and protects developing ovules, transforming into fruit after fertilisation.

Ovule

The structure inside the flower ovary that contains the female egg cell (gamete) and matures into a seed after fertilisation.

Gamete

The scientific term for a specialized haploid sex cell; in plants, the male gamete is pollen and the female gamete is the ovule.

Pollination

The act of transferring pollen grains from the male anther of a flower to the receptive female stigma.

Fertilisation (Plants)

The fusion of the nucleus of a male gamete (pollen) with the nucleus of a female gamete (ovule) to produce a zygote that forms a seed.

Pollen Tube

A slender tube that germinates from a pollen grain on the stigma and grows downward through the style into the ovary to deliver male DNA to the ovule.

Self-Pollination

The transfer of pollen grains from the anther of a flower to the stigma of the very same flower or another flower on the same plant.

Cross-Pollination

The transfer of pollen from the anther of one flower to the stigma of a different plant of the same species, creating genetic variation.

Insect-Pollinated Flower

A flower adapted for insect pollination characterized by brightly coloured scented petals, nectaries, internal stamens, and sticky pollen.

Wind-Pollinated Flower

A flower adapted for wind pollination characterized by absent or dull petals, no nectaries, long hanging stamens, feathery external stigmas, and abundant light pollen.

Nectary

A nectar-secreting gland located inside an insect-pollinated flower that produces sweet fluid as a reward for visiting insect pollinators.

Feathery Stigma

A large, branching stigma that hangs outside wind-pollinated flowers to maximize surface area for filtering airborne pollen out of the wind.

Sexual Reproduction

Reproduction involving two parents contributing gametes whose nuclei fuse to produce genetically unique, non-identical offspring.

Asexual Reproduction

Reproduction involving only one parent that generates offspring without fertilisation; offspring are genetically identical clones.

Genetic Variation

The genetic diversity within a population resulting from sexual reproduction that improves a species' adaptability and long-term survival.

Runner (Stolon)

A specialized horizontal stem produced by plants like strawberries that grows along the soil surface, forming roots and shoots to produce clones asexually.

Sprouting Tuber

A swollen underground storage organ such as a kumara that sprouts buds and stems to produce genetically identical offspring asexually.

Sprouting Bulb

An underground storage structure composed of fleshy layered leaves (such as garlic or onions) that sprouts roots and shoots asexually.

Plant Cutting

A vegetative propagation technique where a cut stem or shoot is rooted in water or soil to generate an identical clone plant asexually.

Seed Dispersal

The transport of mature seeds away from the parent plant to prevent seedling overcrowding and competition.

Resource Competition (Seedlings)

The struggle between seedlings and parent plants for vital resources including sunlight, soil nutrients, space, and water.

Wind Dispersal

A method of seed dispersal where seeds with wings, parachutes, or light weights are carried away by air currents.

Animal Dispersal

A dispersal mechanism where seeds with hooks cling to animal fur or fleshy fruits are ingested and excreted in droppings elsewhere.

Explosive Dispersal

A mechanism of seed dispersal where dried seed pods split open rapidly and burst under tension, flinging seeds away from the parent.

Water Dispersal

A seed dispersal strategy utilizing buoyant, waterproof seeds or fruits that float along waterways to new habitats.

Photosynthesis

The chemical reaction inside plant chloroplasts producing glucose food from carbon dioxide and water using light energy absorbed by chlorophyll.

Photosynthesis Word Equation

The qualitative chemical summary of plant food production: $\text{Carbon dioxide} + \text{Water} \rightarrow \text{Glucose} + \text{Oxygen}$.

Photosynthesis Symbol Equation

The balanced chemical formula for photosynthesis: $6\text{CO}_2 + 6\text{H}_2\text{O} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$.

Chlorophyll

The green photosynthetic pigment housed inside chloroplasts that traps solar radiation to drive photosynthesis.

Cuticle

The transparent, waxy waterproof coating on the outer surface of a leaf that prevents water loss without blocking light.

Palisade Mesophyll

The upper tissue layer of leaf cells densely packed with chloroplasts and arranged vertically to maximize sunlight absorption for photosynthesis.

Spongy Mesophyll

The lower leaf tissue layer consisting of loosely arranged cells separated by large air spaces that facilitate the diffusion of gases.

Stomata

Microscopic pores predominantly located on the lower epidermis of a leaf that regulate the exchange of carbon dioxide, oxygen, and water vapour.

Boiling Leaf in Water (Starch Test)

The initial step in the starch test where the leaf is placed in boiling water to kill it and make its cell membranes permeable, requiring caution against scalding.