Q2-SCIENCE-3-ECOSYSTEM

1.    These refers to the things that are naturally present in the environment.

• Living things

• Man-made non-living things

• Natural non-living things

• Ecosystem

Answer explanation

Natural non-living things: they're found in nature and aren't made by man. Examples: Sun, moon, stars, sky, clouds, rocks, mountains and lots of more.

2. 2. This refers to the part of the eyes that is inner and darker part of the centered of the iris?

• Pupil

• Iris

• Lens

• Cornea

Answer explanation

The pupil is the opening at the center of the iris through which light passes.

3. 3. What do you call the two holes located at the lower part of the nose. This is where air is being brought inside the body.

• Apex

• Nostrils

• Nasal cavity

• Olfactory bulb

Answer explanation

Your nostrils are holes that lead to your nasal cavities.

4. It is known as “apex” is positioned at the end of the tongue nearest the lips. This is the pointed position of the tongue.

• Tip

• Lateral border

• Retina

• Lingual tonsil

Answer explanation

The tip or apex of the tongue is the most anterior, and most mobile aspect of the organ. The tip is followed by the body of the tongue.

5. 5. Vertebrates are animals that has a backbone in a vertebrate. Mammals, birds, fish, reptiles and amphibians are vertebrates.

• TRUE

• FALSE

Answer explanation

An animal that has a backbone and skeletal system is called a vertebrate. Vertebrates are animals with backbones and skeletal systems.

6. 6. How many bones does humans have?

• 106

• 206

• 306

• 406

Answer explanation

The adult human skeleton is made up of 206 bones. These include the bones of the skull, spine (vertebrae), ribs, arms and legs. Bones are made of connective tissue reinforced with calcium and specialised bone cells. Most bones also contain bone marrow, where blood cells are made.

7. 7. Invertebrates are animals that has no backbone. There are invertebrates that live on land or in water.

• TRUE

• FALSE

Answer explanation

An invertebrate is a cold-blooded animal with no backbone. Invertebrates can live on land—like insects, spiders, and worms—or in water. Marine invertebrates include crustaceans (such as crabs and lobsters), mollusks (such as squids and clams), and coral.

8. 8. This refers to the small flat body coverings of some animals. Fish and reptiles have this part.  

• Shell

• Scales

• Beaks

• Legs

Answer explanation

Scale – one of the many small, hard, thin plates that cover fish, reptiles, and certain other animals.

9. 9. Most land animals have this that let them move around. Some animals can use this part to climb trees or catch smaller animals.

• Beaks

• Shell

• Legs

• Scales

Answer explanation

Legs are limbs or appendages of an animal that are used to support the body, provide movement, and, in modified form, assist in capturing and eating prey (as in certain shellfish, spiders, and insects).

10. 10. Let animals’ breath. It extracts oxygen from the water and let water carry away carbon dioxide.

• Gills

• Legs

• Beaks

• Shell

Answer explanation

Gills are found in aquatic animals like fish and some amphibians. They are specialized respiratory organs that allow these animals to extract oxygen from water and release carbon dioxide.