CBSE Class 5 Science Revision Worksheet Set 12

Topic : Our Skeletal System

1. Give one word for the following:-

a. A group of organs.

b. Framework of bones.

c. A series of small bones that make up the backbone.

d. Hardest substance in our body.

e. The thigh bone

f. Strong tissues that bind the bones at a joint

g. The soft, spongy material found inside the cavities of long bones.

h. The backbone is made up.

i. The muscles are found in the heart.

j. The muscles not our under control.

k. The uppermost vertebra in the neck.

Q-2 Name the type joints present in the following parts:-

a. Elbows

b. Shoulder

c. Neck

d. Knees

e. Hip

f. Fingers

g. Wrist

Question 1. Draw the position of the sun in each case by looking at the shadows formed.
Answer: To determine the position of the sun from a given shadow, remember that the sun is always located on the opposite side of the object relative to its shadow.
1. For the first tree (left): The shadow extends to the right side on the ground. Therefore, the sun must be positioned on the left side in the sky.
2. For the second tree (middle): The shadow is positioned directly underneath or symmetrically around the base, indicating the sun is overhead (directly above the tree).
3. For the third tree (right): The shadow extends to the left side on the ground. Therefore, the sun must be positioned on the right side in the sky.
In simple words: The sun is always opposite to the side where the shadow falls.

Exam Tip: Remember the golden rule of shadows: Light travels in a straight line, so if an object blocks light from a source on one side, the shadow forms on the exact opposite side.

Question 2. Write R in the box against the objects that are transparent, L against those that are translucent and O against those are opaque:
Answer:
Below is the completed table classifying each object correctly as transparent (R), translucent (L), or opaque (O):

In simple words: Transparent objects (R) let light pass through clearly, translucent objects (L) let some light pass through partially, and opaque objects (O) do not let any light pass through at all.

Exam Tip: Be careful with liquids and everyday items like milk packets or dirty water; dirty water and milk scatter light partially making them translucent, whereas pure water and clean lemon juice are transparent.