Second periodic test science 3 | PDF - Free Printable

Problem Analysis:

The image contains a set of multiple-choice questions related to science, specifically focusing on the human eye and its functions. Below is a detailed explanation and solution for each question.

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Question 1: Which one below is a sense organ?

- Options:
- a. tasting
- b. seeing
- c. smelling
- d. touching

#### Solution:
A sense organ is a specialized part of the body that detects stimuli from the environment. The correct answer should be an organ, not an action or process.

- Tasting is a function performed by the tongue (the sense organ).
- Seeing is a function performed by the eyes (the sense organ).
- Smelling is a function performed by the nose (the sense organ).
- Touching is a function performed by the skin (the sense organ).

Among these, the only option that directly refers to a sense organ is "seeing," which corresponds to the eyes.

#### Answer:
b. seeing

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Question 2: Which sense organ is used by the girl in the picture below?

- Image Description: A girl is shown holding her nose.
- Options:
- a. nose
- b. eyes
- c. ears
- d. skin

#### Solution:
The girl in the image is holding her nose, indicating that she is using her nose as a sense organ. The nose is responsible for the sense of smell.

#### Answer:
a. nose

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Question 3: Which of the following is the proper way of caring for our eyes?

- Image Options:
- a. Rubbing the eyes with dirty hands.
- b. Using clean water to wash the eyes.
- c. Wearing contact lenses without cleaning them.
- d. Staring at bright lights.

#### Solution:
Proper eye care involves maintaining cleanliness and avoiding harmful practices. Let's evaluate each option:

- a. Rubbing the eyes with dirty hands: This can introduce dirt and bacteria, leading to infections.
- b. Using clean water to wash the eyes: This is a safe and hygienic practice to remove dust or irritants.
- c. Wearing contact lenses without cleaning them: This can cause irritation and increase the risk of infection.
- d. Staring at bright lights: This can damage the eyes over time.

The correct practice is using clean water to wash the eyes.

#### Answer:
b. Using clean water to wash the eyes.

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Question 4: Part of the eye that is like the "screen" where the image of the object seen is focused.

- Options:
- a. pupil
- b. retina
- c. cornea
- d. hammer

#### Solution:
In the eye, the retina acts like a screen where light rays are focused to form an inverted image. The retina contains photoreceptor cells (rods and cones) that convert light into electrical signals, which are then sent to the brain via the optic nerve.

- Pupil: The black circular opening in the center of the iris, which controls the amount of light entering the eye.
- Cornea: The transparent front part of the eye that helps focus light.
- Hammer: Not a part of the eye.

#### Answer:
b. retina

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Question 5: The outside part of the ear where the girl's earring is pierced.

- Image Description: An image of the outer ear is provided.
- Options:
- a. pinna
- b. ear canal
- c. eardrum
- d. hammer

#### Solution:
The outer part of the ear where earrings are typically pierced is called the pinna (also known as the auricle). It is the visible part of the ear and is made up of cartilage covered by skin.

- Ear canal: The tube that connects the outer ear to the eardrum.
- Eardrum: A thin membrane that vibrates when sound waves hit it.
- Hammer: One of the three tiny bones (ossicles) inside the middle ear.

#### Answer:
a. pinna

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Question 6: It is a nerve that sends messages from ears to brain.

- Options:
- a. auditory nerve
- b. optic nerve
- c. pons
- d. ear canal

#### Solution:
The nerve responsible for transmitting sound signals from the ears to the brain is the auditory nerve. It carries information about sound from the inner ear to the brain for processing.

- Optic nerve: Transmits visual information from the eyes to the brain.
- Pons: A part of the brainstem involved in regulating breathing and other functions.
- Ear canal: A tube that connects the outer ear to the eardrum.

#### Answer:
a. auditory nerve

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Question 7: Fishes breathe in water using their...

- Options:
- a. tail
- b. fins
- c. scales
- d. gills

#### Solution:
Fish extract oxygen from water using gills, which are specialized respiratory organs. Gills have thin, feathery structures that allow for efficient gas exchange between the water and the fish's blood.

- Tail: Used for swimming and propulsion.
- Fins: Used for balance and maneuvering.
- Scales: Provide protection and reduce drag.

#### Answer:
d. gills

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Question 8: In the part of the frog for catching flies and other insects.

- Image Description: An image of a frog's mouth is provided.
- Options:
- a. mouth
- b. long sticky tongue
- c. bill
- d. strong hind legs

#### Solution:
Frogs use their long sticky tongue to catch flies and other insects. The tongue is highly extendable and coated with mucus, allowing it to adhere to prey and pull it back into the frog's mouth.

- Mouth: While important for swallowing, it is not the primary tool for catching prey.
- Bill: Not a feature of frogs; this term is associated with birds.
- Strong hind legs: Used for jumping, not catching prey.

#### Answer:
b. long sticky tongue

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Question 9: Which of the following pairs of animals use their bigger hind legs for jumping?

- Image Options:
- a. Kangaroo
- b. Horse
- c. Elephant
- d. Turtle

#### Solution:
Among the given options, the animal that uses its larger hind legs for jumping is the kangaroo. Kangaroos are well-known for their powerful hind legs, which they use for hopping and leaping.

- Horse: Uses all four legs for running but not primarily for jumping.
- Elephant: Does not jump; its large size makes it unsuitable for jumping.
- Turtle: Cannot jump; it moves slowly on land.

#### Answer:
a. Kangaroo

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Final Answers:

1. b. seeing
2. a. nose
3. b. Using clean water to wash the eyes.
4. b. retina
5. a. pinna
6. a. auditory nerve
7. d. gills
8. b. long sticky tongue
9. a. Kangaroo

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Boxed Final Answer:

\[
\boxed{
\begin{array}{l}
1. \text{b. seeing} \\
2. \text{a. nose} \\
3. \text{b. Using clean water to wash the eyes.} \\
4. \text{b. retina} \\
5. \text{a. pinna} \\
6. \text{a. auditory nerve} \\
7. \text{d. gills} \\
8. \text{b. long sticky tongue} \\
9. \text{a. Kangaroo}
\end{array}
}
\]