Comprehensive Study Guide: Plant and Animal Biology for Final Exam

Plant Structure, Growth, and Development

Root and Shoot Systems

The root system anchors the plant and absorbs water and minerals, while the shoot system consists of stems, leaves, and reproductive structures, responsible for photosynthesis and reproduction.

• Root System: Includes primary root, lateral roots; functions in absorption and anchorage.

• Shoot System: Includes stems, leaves, flowers; functions in support, photosynthesis, and reproduction.

• Example: Carrot (root system), Rose (shoot system).

Plant Tissue Types

Plants have three main tissue types: dermal, vascular, and ground tissues.

• Dermal Tissue: Protective outer layer (epidermis).

• Vascular Tissue: Conducts water and nutrients (xylem and phloem).

• Ground Tissue: Functions in photosynthesis, storage, and support (parenchyma, collenchyma, sclerenchyma).

Meristems and Plant Growth

Apical meristems are found at the tips of roots and shoots, enabling primary growth (lengthening). Lateral meristems (vascular cambium, cork cambium) enable secondary growth (thickening).

• Primary Growth: Increases length via apical meristems.

• Secondary Growth: Increases girth via lateral meristems.

• Example: Tree rings are a result of secondary growth.

Stem and Leaf Anatomy

Stems contain vascular bundles; leaves have epidermis, mesophyll, and veins.

• Stem: Epidermis, cortex, vascular bundles (xylem/phloem).

• Leaf: Cuticle, epidermis, palisade and spongy mesophyll, veins.

Resource Acquisition and Transport in Plants

Water Transport

Water moves from roots to leaves via the xylem by transpiration, cohesion, and adhesion.

• Transpiration: Evaporation of water from leaves creates negative pressure.

• Cohesion and Adhesion: Water molecules stick together and to walls.

• Example: Tall trees rely on these mechanisms for water transport.

Sugar Transport

Sugars are transported via phloem from sources (leaves) to sinks (roots, fruits) by pressure-flow mechanism.

• Source: Photosynthetic tissues.

• Sink: Growing tissues, storage organs.

• Equation: $\text{Pressure-flow:} \quad \text{Sugar moves from high to low pressure}$

Adaptations for Resource Acquisition

Plants adapt to maximize water, light, and nutrient uptake.

• Root hairs: Increase surface area for absorption.

• Leaf arrangement: Maximizes light capture.

• Mycorrhizae: Fungal associations enhance nutrient uptake.

Mutualistic Relationships

Plants form mutualisms with fungi (mycorrhizae) and bacteria (nitrogen-fixing).

• Mycorrhizae: Fungi provide minerals; plants provide sugars.

• Rhizobia: Bacteria fix nitrogen in legume roots.

Photosynthesis and Cellular Respiration

Relationship and Overall Reactions

Photosynthesis and cellular respiration are complementary processes.

• Photosynthesis: Converts CO2 and H2O to glucose and O2.

• Cellular Respiration: Breaks down glucose to release energy, CO2, and H2O.

• Equations:

$\text{Photosynthesis:} \quad 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2$

$\text{Cellular Respiration:} \quad C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{ATP}$

Stages and Locations

• Photosynthesis: Occurs in chloroplasts; light reactions (thylakoid), Calvin cycle (stroma).

• Cellular Respiration: Occurs in mitochondria; glycolysis (cytoplasm), Krebs cycle and ETC (mitochondria).

Absorption and Action Spectrum

Different pigments absorb different wavelengths; action spectrum shows effectiveness for photosynthesis.

• Chlorophyll: Absorbs blue and red, reflects green.

• Action Spectrum: Peaks in blue and red regions.

Plant Reproduction and Development

Flower, Seed, and Fruit Structure

Flowers contain reproductive organs; seeds are fertilized ovules; fruits develop from ovaries.

• Flower: Sepals, petals, stamens, carpels.

• Seed: Embryo, endosperm, seed coat.

• Fruit: Protects seeds, aids dispersal.

Double Fertilization in Angiosperms

Unique to angiosperms; one sperm fertilizes egg, another fuses with two nuclei to form endosperm.

• Result: Embryo and nutritive tissue (endosperm).

Pollination and Coevolution

Pollinators (insects, birds, wind) transfer pollen; coevolution shapes plant and pollinator traits.

• Example: Hummingbirds and tubular flowers.

Plant Hormones and Responses

Plant Hormones

Hormones regulate growth and responses.

• Auxin: Cell elongation.

• Gibberellin: Stem growth, seed germination.

• Cytokinin: Cell division.

• Ethylene: Fruit ripening.

• Abscisic Acid: Stress response.

Plant Responses to Stimuli

Plants respond to light (phototropism), gravity (gravitropism), and touch (thigmotropism).

• Phototropism: Growth toward light.

• Gravitropism: Roots grow down, shoots up.

• Thigmotropism: Response to touch (e.g., tendrils).

Animal Structure and Function

Animal Tissue Types

Animals have four main tissue types.

• Epithelial: Covers surfaces (skin, lining).

• Connective: Supports and binds (bone, blood).

• Muscle: Movement (skeletal, cardiac, smooth).

• Nervous: Communication (neurons, glia).

Homeostasis and Feedback

Homeostasis maintains internal balance; feedback mechanisms regulate processes.

• Negative Feedback: Reduces change (e.g., temperature regulation).

• Positive Feedback: Amplifies change (e.g., childbirth).

Endotherms vs. Ectotherms

Endotherms generate heat internally; ectotherms rely on external sources.

• Example: Mammals (endotherms), reptiles (ectotherms).

Metabolic Rate Factors

Metabolic rate is affected by size, activity, temperature, and diet.

Animal Nutrition and Digestion

Dietary Requirements

Animals need carbohydrates, proteins, lipids, vitamins, minerals, and water.

Digestive System Pathway

Food passes through mouth, esophagus, stomach, intestines; accessory organs aid digestion.

• Structures: Mouth, pharynx, esophagus, stomach, small and large intestine, rectum.

• Accessory Organs: Liver, pancreas, gallbladder.

• Enzymes: Amylase (carbs), pepsin (proteins), lipase (lipids).

Glucose Homeostasis

Insulin lowers blood glucose; glucagon raises it.

• Equation: $\text{Insulin:} \quad \text{Glucose} \rightarrow \text{Glycogen}$

• Glucagon:} \quad \text{Glycogen} \rightarrow \text{Glucose}$

Circulation and Gas Exchange

Circulatory System Pathway

Blood flows through heart, arteries, capillaries, veins.

• Structures: Heart chambers, valves, vessels.

Blood Pressure and Velocity

Pressure highest in arteries, lowest in veins; velocity slowest in capillaries.

Respiratory System Pathway

Air enters via nose/mouth, passes through trachea, bronchi, lungs; gas exchange in alveoli.

Immune System

Innate and Adaptive Immunity

Innate immunity is non-specific; adaptive immunity is specific.

• Innate: Skin, phagocytes, inflammation.

• Adaptive: Humoral (B cells, antibodies), cell-mediated (T cells).

Immune Disorders

Includes allergies, autoimmune diseases, immunodeficiency.

Excretion and Osmoregulation

Nitrogenous Wastes

Ammonia, urea, uric acid; excreted by different animals.

• Ammonia: Fish.

• Urea: Mammals.

• Uric Acid: Birds, reptiles.

Urine Production

Blood filtered in kidneys; urine passes through ureters, bladder, urethra.

Endocrine System

Endocrine Glands and Hormones

Glands secrete hormones affecting target cells.

• Pituitary: Growth hormone.

• Thyroid: Thyroxine.

• Adrenal: Adrenaline.

• Pancreas: Insulin, glucagon.

Hormone Effects

Effect depends on receptor and cell type.

Reproduction and Development

Asexual and Sexual Reproduction

Asexual: cloning; sexual: gamete fusion.

Male and Female Anatomy

Male: testes, vas deferens, penis; Female: ovaries, uterus, vagina.

Ovarian and Menstrual Cycles

Ovarian cycle: follicular, ovulation, luteal; Menstrual cycle: menstruation, proliferative, secretory.

Embryonic Development Stages

Cleavage, gastrulation, organogenesis.

Nervous System and Sensory Organs

Neuron Structure and Function

Neurons have dendrites, cell body, axon; transmit signals.

Types of Neurons

• Sensory: Detect stimuli.

• Motor: Cause movement.

• Interneurons: Integrate information.

Resting and Action Potential

Resting potential: maintained by sodium-potassium pump; action potential: rapid depolarization and repolarization.

• Equation: $\text{Na^+/K^+ pump:} \quad 3Na^+ \text{out}, 2K^+ \text{in}$

Depolarization, Repolarization, Hyperpolarization

Depolarization: Na+ in; repolarization: K+ out; hyperpolarization: excess K+ out.

Myelin and Conduction

Myelin increases speed; produced by Schwann cells (PNS), oligodendrocytes (CNS).

Synapses and Neurotransmitters

Chemical and electrical synapses; neurotransmitters include acetylcholine, dopamine, serotonin.

Autonomic Nervous System

Sympathetic: "fight or flight"; Parasympathetic: "rest and digest".

Brain Structures and Functions

Cerebrum (thinking), cerebellum (coordination), brainstem (basic functions).

Ear and Hearing

Structures: outer ear, middle ear, inner ear; cochlea transduces sound.

Eye and Vision

Structures: cornea, lens, retina; pathway: retina → optic nerve → cortex.

Muscle and Skeleton

Skeletal Muscle Structure

Muscle fibers contain myofibrils; sarcomeres are contractile units.

Sliding Filament Model

Actin and myosin slide past each other; calcium triggers contraction.

Types of Skeletons

• Hydrostatic: Worms.

• Exoskeleton: Insects.

• Endoskeleton: Vertebrates.

Animal Behavior and Ecology

Animal Communication and Learning

Communication: visual, auditory, chemical, tactile; learning: habituation, imprinting, conditioning.

Behavior and Survival

Optimal foraging maximizes energy; mating systems affect reproductive success.

Natural Selection and Altruism

Behaviors shaped by selection; altruism benefits relatives.

Biotic and Abiotic Factors

Biotic: living; abiotic: non-living (temperature, water).

Population and Community Ecology

Growth Models

Exponential: unlimited resources; logistic: limited resources.

• Equation: $\text{Exponential:} \quad \frac{dN}{dt} = rN$

• Logistic:} \quad \frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$

Interspecific Interactions

Mutualism (+/+), predation (+/-), competition (-/-), commensalism (+/0).

Food Chains and Webs

Energy flows from producers to consumers; food webs show complex interactions.

Succession

Primary: starts from bare substrate; secondary: after disturbance.

Energy Flow and Chemical Cycling

Energy flows one-way; chemicals recycled.

• Example: Carbon, nitrogen cycles.

Plant Tissue Type	Main Function	Example
Dermal	Protection	Epidermis
Vascular	Transport	Xylem, Phloem
Ground	Support, Storage, Photosynthesis	Parenchyma

Animal Tissue Type	Main Function	Example
Epithelial	Covering/lining	Skin
Connective	Support	Bone
Muscle	Movement	Skeletal muscle
Nervous	Communication	Neuron

Feedback Type	Effect	Example
Negative	Reduces change	Temperature regulation
Positive	Amplifies change	Childbirth

Nitrogenous Waste	Excreted By
Ammonia	Fish
Urea	Mammals
Uric Acid	Birds, Reptiles

Skeleton Type	Example
Hydrostatic	Earthworm
Exoskeleton	Insect
Endoskeleton	Human

Interspecific Interaction	Effect	Example
Mutualism	+/+	Bees and flowers
Predation	+/-	Wolf and deer
Competition	-/-	Plants for light
Commensalism	+/0	Barnacles on whales

Additional info: Academic context and examples were added to ensure completeness and clarity for exam preparation.