The body's ability to maintain a stable internal environment despite external changes is known as:

Which type of muscle is characterized by being striated, attached to bones, and under voluntary control?

The point where two bones meet is called a:

A ball-and-socket joint, which allows movement in all directions, is found in the:

Which disorder is characterized by a sideways curvature of the spine?

The outermost layer of the skin, which continuously produces new cells, is the:

Sweat glands and oil glands are primarily located in which layer of the skin?

The process of physically breaking down food in the mouth through chewing is called:

In which organ does the majority of nutrient absorption into the bloodstream occur?

Finger-like projections in the small intestine that increase the surface area for absorption are called:

The primary function of the excretory system is to:

Which organ is primarily responsible for filtering blood to produce urine?

The main function of the circulatory system is to:

Which blood vessels carry oxygen-rich blood away from the heart?

The upper chambers of the heart that receive blood are called:

The tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place are called:

The dome-shaped muscle that plays a crucial role in the breathing process is the:

Which part of the nervous system serves as the central control unit, consisting of the brain and spinal cord?

The part of the brain responsible for balance and coordination is the:

The process by which plants make their own food using sunlight is called:

The green pigment in plant leaves that captures sunlight is:

Tiny openings on the underside of leaves that allow for gas exchange are called:

Which part of the plant is primarily responsible for anchoring it and absorbing water and minerals?

A carrot is an example of a plant with a:

Which of the following is a spore-bearing plant?

Pine trees and cypress are examples of:

A new strawberry plant growing from a horizontal stem, or runner, is an example of:

Which artificial method of plant propagation involves attaching a scion to a stock?

An animal that eats only plants is called a(n):

A tiger, which eats only other animals, is a:

Humans, who eat both plants and animals, are classified as:

Which of the following is a vertebrate?

Animals without a backbone are called:

Which group of invertebrates has an exoskeleton and jointed legs?

A specific place where an animal or plant lives and finds its needs is its:

A coral reef is an example of a(n):

Which of the following is an endemic animal found only in specific parts of the Philippines?

The 'rainforest of the sea' is a term often used to describe a:

A series of changes a living thing goes through from birth to death is called its:

Which stage of the human life cycle is characterized by puberty and rapid physical changes?

A life cycle that includes the stages egg, larva, pupa, and adult is known as:

A grasshopper undergoes incomplete metamorphosis. What is the stage between egg and adult called?

In a food chain, which organism is always the primary source of energy?

In the food chain: Grass → Grasshopper → Frog → Heron, the frog is the:

What do the arrows in a food chain represent?

An ecosystem is composed of:

A close, long-term relationship between two different species is called:

A bee pollinating a flower while gathering nectar is an example of:

An orchid growing on a tree branch without harming the tree is an example of:

A tick feeding on the blood of a dog is an example of:

An eagle catching and eating a rabbit is an example of:

When two organisms fight for the same limited resource (e.g., food, water, space), it is called:

Which of the following is an abiotic factor in an ecosystem?

A group of organisms of the same species living in a given area is called a:

All the different populations that live together in an area make up a:

Mangrove swamps are important because they serve as:

The practice of "Refuse, Reduce, Reuse, Repurpose, Recycle" helps to:

If a disease wiped out most of the grass in a prairie ecosystem, which organism would be affected first?

A patient has a condition where their body attacks the myelin sheath surrounding their neurons. This would most directly affect:

A person is diagnosed with anemia. This means they most likely have a problem with their:

After a heavy meal, your body will direct more blood flow to your digestive system. This is primarily regulated by the:

You are observing an animal in a forest. It has moist skin, lays its eggs in water, and spends its early life as a tadpole. This animal is most likely a(n):

You find a plant with needle-like leaves and cones. This plant is most likely adapted to:

In a mangrove swamp, the water is brackish. This means the water is:

The hard, shell-like structure that makes up a coral reef is primarily composed of:

If a predator species in an ecosystem suddenly became extinct, the population of its prey would likely:

Which of the following is the best way to help protect endemic species like the Philippine Eagle?

A farmer wants to grow many new plants that are genetically identical to a prized parent plant. The most efficient method would be:

A person suffers a ligament injury from twisting their ankle. This is specifically called a:

The "lub-dub" sound of the heart is caused by:

Which of the following is a correct path of air during inhalation?

The functional unit of the kidney that filters blood is the:

Which of the following is a primary function of the skeletal system?

Gymnosperms are plants that produce "naked seeds" not enclosed in an ovary (fruit); their seeds are typically held in cones.

Vegetative propagation is a form of asexual reproduction where a new plant grows from a part of the parent plant (e.g., runners, tubers, bulbs).

Grafting is an artificial propagation method where the stem (scion) of one plant is joined to the stem and root (stock) of another.

Herbivores are primary consumers that eat producers (plants).

Carnivores are consumers that eat other animals (meat).

Omnivores are consumers that eat both plants and animals.

Vertebrates are animals with a backbone. Frogs are amphibians, which are vertebrates. Jellyfish, spiders, and earthworms are invertebrates.

Invertebrates are animals that lack a vertebral column (backbone). They make up the vast majority of animal species.

Arthropods (e.g., insects, spiders, crustaceans) are characterized by a segmented body, an exoskeleton made of chitin, and jointed appendages.

A habitat is the natural environment where an organism lives, which provides its food, water, shelter, and space.

A coral reef is an ecosystem found in marine (saltwater) environments, making it an aquatic habitat.

An endemic species is one that is only found in a specific geographic location. The Philippine Eagle is endemic to the Philippines.

Coral reefs have extremely high biodiversity, rivaling that of tropical rainforests, hence the nickname "rainforests of the sea."

A life cycle describes the series of stages (e.g., birth, growth, reproduction, death) an organism passes through.

Adolescence is the stage of human development between childhood and adulthood, marked by the onset of puberty and significant physical and emotional changes.

Complete metamorphosis has four distinct stages: egg, larva (e.g., caterpillar), pupa (e.g., chrysalis), and adult (e.g., butterfly).

In incomplete metamorphosis, the young (called nymphs) resemble smaller versions of the adults and molt several times before reaching maturity.

Producers (autotrophs), primarily plants, form the base of every food chain by converting solar energy into chemical energy (food) via photosynthesis.

The grass is the producer. The grasshopper (herbivore) is the primary consumer. The frog (eats the grasshopper) is the secondary consumer.

Arrows in a food chain or web always point from the organism being eaten to the organism that is consuming it, showing the transfer of energy.

An ecosystem includes all the living organisms (biotic factors) in an area as well as the non-living physical components (abiotic factors) they interact with.

Symbiosis is a close and long-term biological interaction between two different biological organisms.

Mutualism is a symbiotic relationship where both species benefit. The bee gets food (nectar), and the flower gets pollinated.

Commensalism is a relationship where one organism benefits and the other is neither helped nor harmed. The orchid benefits from support and access to light, while the tree is unaffected.

Parasitism is a relationship where one organism (the parasite) benefits at the expense of the other (the host), which is harmed.

Predation is an interaction where one organism (the predator) hunts, kills, and eats another organism (the prey).

Competition is an interaction between organisms that vie for the same limited resources in their environment.

Intraspecific competition occurs between individuals of the same species (e.g., trees of the same species competing for sunlight).

Abiotic factors are the non-living chemical and physical parts of the environment. Rocks, sunlight, temperature, and water are all abiotic.

A population is a group of individuals of the same species living in the same area at the same time.

A community consists of all the different populations (multiple species) that live together in a defined area.

The tangled roots of mangrove trees provide protected, nutrient-rich waters that serve as ideal breeding and nursery grounds for many fish and invertebrate species.

The 5Rs help minimize waste, reduce pollution, conserve resources, and lessen the strain on landfills and natural environments.

In this chain, grass (producer) → rabbits (primary consumer). If the producer is removed, the primary consumer that relies on it directly for food will be affected first.

The myelin sheath acts as an insulator, allowing electrical nerve impulses to travel quickly along the axon. Its destruction severely slows down neural communication.

Anemia is a condition characterized by a deficiency of red blood cells or hemoglobin, leading to reduced oxygen-carrying capacity of the blood.

The "rest and digest" division of the autonomic nervous system conserves energy and directs activity to vegetative functions like digestion.

These are key characteristics of amphibians: moist skin, aquatic larval stage (tadpole), and eggs that require a moist environment.

Needle-like leaves (with a small surface area) and cones are adaptations of conifers (gymnosperms) to reduce water loss and withstand cold conditions.

Brackish water occurs in estuaries where freshwater from rivers meets and mixes with saltwater from the ocean.

Coral polyps secrete hard skeletons of calcium carbonate, which over time build up to form the massive structure of a coral reef.

Without the controlling pressure of predation, the prey population would likely experience rapid growth until another limiting factor (e.g., food, disease) arises.

The greatest threat to most endemic species is habitat loss and fragmentation. Conservation efforts focus on preserving and restoring these critical habitats.

Vegetative propagation is an asexual reproduction method that produces genetically identical clones of the parent plant, preserving its desired traits.

A sprain is an injury to a ligament (which connects bone to bone). A strain is an injury to a muscle or tendon.

The "lub" sound is caused by the closing of the atrioventricular valves. The "dub" sound is caused by the closing of the semilunar valves.

This is the correct sequence for the path of air during inhalation.

The nephron is the microscopic functional unit of the kidney where blood filtration, reabsorption, and urine formation occur.

Hematopoiesis, the production of blood cells, occurs in the bone marrow, which is part of the skeletal system.

Which part of the plant is primarily responsible for photosynthesis?

What is the primary role of red blood cells in the human body?

Which of the following is a characteristic of mammals?