reviewer quarter 2

Part I – Multiple Choice. Directions: Choose the letter of the correct answer. Write the chosen letter on the space provided before each number. When Liza enjoys a delicious sandwich at her favorite café, which sequence best shows the path of food through her digestive system?

• Mouth → Lungs → Stomach → Intestines

• Mouth → Esophagus → Heart → Intestines

• Mouth → Esophagus → Stomach → Small Intestine → Large Intestine

• Mouth → Trachea → Stomach → Kidneys

Answer explanation

The correct sequence is Mouth → Esophagus → Stomach → Small Intestine → Large Intestine, as food travels through these organs for digestion and absorption, unlike the other options which include incorrect organs.

During a science experiment, Paolo breathes in and out through a tube connected to a balloon lung model. What does the balloon represent in the human respiratory system?

• Diaphragm

• Lungs

• Windpipe (Trachea)

• Nose

Answer explanation

The balloon in the model represents the lungs in the human respiratory system. Just as the lungs expand and contract to facilitate breathing, the balloon inflates and deflates when air is pushed in and out through the tube.

In a biology class, the teacher asked the students to identify which pair of organs produces cells needed for human reproduction.

• Heart and Brain

• Ovaries and Testes

• Lungs and Kidneys

• Stomach and Liver

Answer explanation

The ovaries and testes are the primary reproductive organs in humans. Ovaries produce eggs, while testes produce sperm, both essential for human reproduction.

Emma, a gardener, plants two seeds—one that bears flowers and fruits and another that produces cones. Which statement is TRUE about these plants?

• Both are gymnosperms because they produce seeds inside cones.

• Both are angiosperms because they have flowers.

• The flowering plant is an angiosperm while the cone-bearing plant is a gymnosperm.

• Neither is a seed-bearing plant.

Answer explanation

The correct statement is that the flowering plant is an angiosperm, as it produces flowers and fruits, while the cone-bearing plant is a gymnosperm, which produces seeds in cones.

In a biology class, the teacher asked the students to classify two animals based on their reproduction methods. The animals in question are a Frog and a Cow. Which pair shows these animals correctly classified based on how they reproduce?

• Frog – gives birth to live young; Cow – lays eggs

• Frog – lays eggs; Cow – gives birth to live young

• Both lay eggs

• Both give birth to live young

Answer explanation

Frogs reproduce by laying eggs in water, while cows give birth to live young. Therefore, the correct classification is: Frog – lays eggs; Cow – gives birth to live young.

Lily and Grace are studying the life cycles of a butterfly and a frog for their science project. They want to know which stage in their life cycles is similar. Can you help them?

• Egg

• Larva

• Adult

• Pupa

Answer explanation

Both butterflies and frogs start their life cycles from eggs. This stage is common to both species, making 'Egg' the correct answer. Other stages like larva and pupa are specific to butterflies, while frogs have tadpoles.

Imagine Liam decides to grow a new ginger plant in his garden using a piece of its rhizome. What kind of reproduction would he observe?

• Sexual reproduction through seeds

• Asexual reproduction through underground stems

• Fertilization through pollen transfer

• Spore formation like in ferns

Answer explanation

Growing a new ginger plant from its rhizome involves asexual reproduction through underground stems. This method allows the plant to propagate without the need for seeds or fertilization.

A penguin can slide on ice and swim swiftly underwater. Which adaptations help it survive in its cold environment?

• Thick feathers and flippers for swimming

• Thin fur and long legs for running

• Large ears and short tail

• Camouflage and sharp claws

Answer explanation

Thick feathers provide insulation against the cold, while flippers are essential for swimming efficiently in water, making them crucial adaptations for penguins in their icy habitats.

Emma was in a hurry during lunch and ate her meal too quickly, which led to a painful sensation in her stomach. Which process of digestion was most likely affected?

• Absorption of nutrients

• Elimination of waste

• Proper breakdown of food in the stomach

• Air exchange in the lungs

Answer explanation

The student ate too fast, likely leading to improper breakdown of food in the stomach. This process is crucial for digestion, and if disrupted, it can cause discomfort and pain.

During a biology class, Scarlett learned about the respiratory system. Her teacher asked the class, "Which part of the respiratory system serves as the main passageway for air entering the lungs?"

• Trachea

• Diaphragm

• Bronchioles

• Nostrils

Answer explanation

The trachea is the main passageway for air entering the lungs, connecting the larynx to the bronchi. It allows air to flow in and out of the lungs, making it essential for respiration.