VCE UNIT 1 AOS 2

What are the key steps in conducting a scientific investigation?

Develop aims and questions, formulate hypotheses, make predictions, plan and conduct investigations, comply with safety and ethical guidelines, generate, collate, and record data, analyze and evaluate data and investigation methods.

What is the primary function of parenchyma cells in plants?

Parenchyma cells are involved in storage, photosynthesis, and tissue repair.

What are the four levels of biological organization?

Cell, Tissue, Organ, System, Organism.

What are the three types of muscle tissue in animals?

Skeletal muscle, Cardiac muscle, Smooth muscle.

What is the role of xylem cells in vascular plants?

Xylem cells transport water and minerals from the roots to the rest of the plant.

What is the function of phloem cells?

Phloem cells transport sugars and nutrients produced by photosynthesis throughout the plant.

What are the main organs of plant tissue?

Leaves, Stems, Roots, Fruits, Flowers.

What are the four types of animal tissue?

Muscle tissue, Connective tissue, Epithelial tissue, Nervous tissue.

What is the primary function of epithelial tissue?

Epithelial tissue provides protection, secretion, and absorption.

What is the difference between vascular and non-vascular plants?

Vascular plants have specialized tissues (xylem and phloem) for transporting water and nutrients, while non-vascular plants lack these tissues.

What are the main functions of the digestive system?

The digestive system breaks down food, absorbs nutrients, and eliminates waste.

What is the role of guard cells in plants?

Guard cells regulate the opening and closing of stomata to control gas exchange and water loss.

What factors impact transpiration in plants?

Wind, light, temperature, humidity, water availability, and water loss.

What is translocation in plants?

Translocation is the movement of nutrients and sugars through the phloem from sources to sinks in the plant.

What are the main body systems in animals?

Digestive system, Excretory system, Endocrine system, Muscular system, Skeletal system, Integumentary system, Nervous system, Immune system, Respiratory system, Blood circulatory system, Reproductive system.

What is the function of smooth muscle?

Smooth muscle is involuntary and helps with processes like digestion and blood vessel regulation.

What is the primary function of cardiac muscle?

Cardiac muscle is involuntary and responsible for the contractions of the heart.

What are the key structures involved in photosynthesis?

Chloroplasts in leaves primarily conduct photosynthesis, producing glucose and oxygen.

What is the significance of vascular tissue in plants?

Vascular tissue allows for efficient transport of water, nutrients, and food, enabling larger growth.

What are the common types of animal cells?

Muscle cells, Nerve cells, Epithelial cells, and Connective tissue cells.

How do roots function in plants?

Roots absorb water and nutrients from the soil and provide support and structure.

What is the role of the shoot system in plants?

The shoot system is responsible for reproductive (flowers and fruit) and non-reproductive (leaves and stems) functions.

What is the function of connective tissue?

Connective tissue connects and supports other tissues and organs in the body.

What are sclerenchyma cells?

Sclerenchyma cells provide structural support and are typically dead at maturity.

What is the role of collenchyma cells?

Collenchyma cells provide flexible support to growing parts of the plant.

What is the main function of the nervous system?

The nervous system detects stimuli and transmits electrical signals throughout the body.

What is the primary role of the immune system?

The immune system protects the body against pathogens and foreign substances.

What are the four stages of digestion?

Ingestion, Digestion, Absorption, Egestion

What is the primary function of the digestive system?

To break down food into smaller pieces for nutrient absorption.

What is mechanical digestion?

The physical breakdown of food into smaller pieces through actions like chewing and muscle contractions.

What is chemical digestion?

The breakdown of food by enzymes into smaller molecules that can be absorbed.

What is the role of amylase?

Amylase is an enzyme that breaks down carbohydrates.

What is the role of proteases?

Proteases are enzymes that break down proteins.

What is the function of lipases?

Lipases are enzymes that digest fats and lipids.

What is the function of bile?

Bile breaks down large fat droplets into smaller droplets, aiding in fat digestion.

What is peristalsis?

Muscular waves that move food through the digestive tract.

What structures are involved in the digestive system?

Mouth, salivary glands, oesophagus, stomach, liver, gallbladder, pancreas, small intestine, large intestine, and appendix.

What is the role of villi in the small intestine?

Villi increase the surface area for nutrient absorption.

What is chyme?

Partially digested food that leaves the stomach.

What is the function of the lower oesophageal sphincter?

It prevents reflux of stomach acid into the oesophagus.

What is the role of the pyloric sphincter?

It controls the entry of chyme into the small intestine.

What is the alimentary canal?

The long tube from the mouth to the anus that makes up the digestive system.

What is the significance of surface area to volume ratio in digestion?

A larger surface area allows for more efficient enzyme action and nutrient absorption.

What happens during egestion?

Undigested food is eliminated from the body as waste.

What is the function of the pancreas in digestion?

The pancreas secretes enzymes and bicarbonate to aid in digestion and neutralize stomach acid.

What is the role of salivary glands?

They produce saliva, which contains amylase to begin carbohydrate digestion.

What is the length of the small intestine?

Approximately 6.2 meters long.

What is the role of the liver in digestion?

The liver produces bile, which is stored in the gallbladder and helps in fat digestion.

What does the term 'bolus' refer to?

The mass of food that is swallowed and enters the stomach.

What is the function of the large intestine?

To reabsorb water and process waste material into feces.

What is the rectum's role in the digestive system?

It stores feces before elimination from the body.

What is a heterotroph?

An organism that cannot produce its own food and relies on consuming other organisms.

What is an autotroph?

An organism that produces its own food, typically through photosynthesis.

What are the three major types of consumers?

Herbivores, carnivores, and omnivores.

What are the main components of faeces?

Food remains, water, bacteria, dead cells, undigested proteins, enzymes, fat, fibre, and inorganic matter.

How do organisms obtain energy?

Organisms can be classified as autotrophs, which produce their own energy, or heterotrophs, which consume energy from other organisms.

What are autotrophs also known as?

Producers.

Give examples of autotrophs.

Plants, algae, phytoplankton, and some types of bacteria.

What are heterotrophs also known as?

Consumers.

What types of diets are classified in animals?

Herbivore, carnivore, and omnivore.

What is a characteristic of herbivores' digestive systems?

Herbivores have longer small and large intestines to digest plant material, which is harder to break down.

What is a characteristic of carnivores' digestive systems?

Carnivores have shorter digestive tracts as meat is easier to digest.

What is unique about omnivores' digestive systems?

Omnivores have a digestive system that is intermediate in length between herbivores and carnivores.

What is the role of gut microbes in herbivores?

Gut microbes help in the fermentation and digestion of cellulose from plant matter.

What are hindgut fermenters?

Herbivores with expanded colons and caecum for bacterial digestion, such as rhinos and rabbits.

What are foregut fermenters?

Herbivores with larger stomachs and multiple compartments, such as cows and goats.

What is the main function of incisors in teeth structure?

Incisors are used for biting, often hard food that is plant-based.

What is the main function of canines in teeth structure?

Canines are used for tearing meat.

What is the main function of molars and premolars?

They are used for grinding a mixture of foods, crucial for mechanical digestion.

What is the significance of the SA:Vol ratio in digestion?

A higher surface area to volume ratio allows for more efficient absorption and digestion of nutrients.

What are the four key stages of digestion?

Ingestion, digestion, absorption, and elimination.

Where does chemical digestion primarily occur?

Chemical digestion occurs in the stomach and small intestine.

What is the role of enzymes in digestion?

Enzymes break down nutrients into smaller molecules that can be absorbed.

What is the function of villi in the small intestine?

Villi increase the surface area for absorption of nutrients.

How do herbivores differ from carnivores in terms of digestive tract length?

Herbivores have longer digestive tracts to allow more time for digestion of complex plant materials.

What is the digestive system structure of a typical carnivore?

Carnivores have a simpler digestive system with a shorter small intestine and reduced caecum.

What is a key difference in teeth structure between herbivores and carnivores?

Herbivores have flat molars for grinding plants, while carnivores have pointier molars for tearing meat.

What is the importance of the digestive system?

The digestive system breaks down food into nutrients that the body can absorb and use for energy, growth, and repair.

What types of nutrients do animals consume?

Proteins, carbohydrates, fats, vitamins, and minerals.

What is the function of the small intestine?

The small intestine is where most digestion and absorption of nutrients occurs.

What is the role of the large intestine?

The large intestine absorbs water and forms waste material (faeces).

What adaptations do herbivores have for digesting cellulose?

Herbivores have longer digestive tracts and a higher concentration of gut microbes to aid in cellulose digestion.

What is the relationship between the pancreas, liver, and gallbladder?

They all contribute to digestion by producing enzymes and bile that aid in the breakdown of food in the small intestine.

What is the main purpose of the excretory system?

To remove excess and unwanted substances from the body and regulate water and ion concentration.

What are the main nitrogenous wastes produced from protein breakdown?

Ammonia, urea, and uric acid.

What is the primary nitrogenous waste excreted by mammals?

Urea.

What are the components of the urinary tract?

Kidneys, ureters, bladder, and urethra.

What is the role of the kidneys in urine production?

To filter blood by reabsorbing useful substances and removing waste.

What is the structure of a nephron?

A nephron consists of the glomerulus, Bowman's capsule, proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct.

What is the function of the glomerulus?

To filter blood and form filtrate.

Where does selective reabsorption occur in the nephron?

In the proximal convoluted tubule.

What is the significance of the loop of Henle?

It establishes a salt gradient for water reabsorption.

What is the difference between secretion and absorption in the nephron?

Secretion moves waste products from blood into tubules, while absorption moves useful substances from tubules back into blood.

What is the function of the distal convoluted tubule?

To fine-tune the composition of the filtrate and allow for further selective reabsorption.

What is the role of the collecting duct?

To collect urine from multiple nephrons and transport it to the renal pelvis.

How do ammonia, urea, and uric acid differ in terms of toxicity and water requirement?

Ammonia is very toxic and requires a lot of water to excrete; urea is less toxic and requires moderate water; uric acid is less toxic and requires very little water.

What happens to nitrogenous wastes in aquatic organisms?

They excrete ammonia directly due to its high solubility in water.

How is urea formed in the body?

Urea is formed in the liver from ammonia and is excreted via the kidneys.

What is the significance of the renal cortex and medulla?

The cortex is the outer layer of the kidney, while the medulla is the inner layer that is salty and aids in water reabsorption.

What is the importance of the SA:Vol ratio in the digestive system?

Enzymes and villi increase the surface area to volume ratio to enhance nutrient absorption.