Educational worksheet teaching children about physical activity and its effects on the body.

Problem Analysis:

The worksheet is designed to teach children about physical activity and its effects on the body. Let's break down each part of the problem and solve it step by step.

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Part 1: Tick the children who are doing physical activity.

#### Images:
1. First Row:
- Image 1: Children are jumping rope.
- Activity: Physical activity (jumping rope involves movement and exercise).
- Image 2: Children are sitting and reading.
- Activity: No physical activity (reading is a sedentary activity).
- Image 3: Children are sitting and using laptops.
- Activity: No physical activity (using laptops is a sedentary activity).

2. Second Row:
- Image 4: Children are jumping on a trampoline.
- Activity: Physical activity (jumping on a trampoline involves movement and exercise).
- Image 5: Children are riding bicycles, scooters, and pulling a wagon.
- Activity: Physical activity (riding bicycles and scooters, as well as pulling a wagon, involve movement and exercise).
- Image 6: A child is lying in bed.
- Activity: No physical activity (lying in bed is a sedentary activity).

#### Solution:
- Tick the images where children are doing physical activity:
- Image 1 (jumping rope)
- Image 4 (jumping on a trampoline)
- Image 5 (riding bicycles, scooters, and pulling a wagon)

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Part 2: This boy is playing basketball, so his heartbeat and his breathing.

#### Explanation:
When a person engages in physical activity like playing basketball, their body requires more oxygen to fuel the muscles. This leads to an increase in both heart rate and breathing rate to deliver more oxygen to the body.

#### Solution:
- Heartbeat: Increases
- Breathing: Increases

So, the answers are:
- Heartbeat: Increases
- Breathing: Increases

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Part 3: This girl was running but now she is resting, so her heartbeat and her breathing.

#### Explanation:
After engaging in physical activity like running, the body continues to recover even after the activity has stopped. During recovery, the heart rate and breathing rate gradually return to normal levels. However, immediately after stopping, they are still higher than at rest but begin to decrease.

#### Solution:
- Heartbeat: Decreases (but is still higher than at complete rest)
- Breathing: Decreases (but is still higher than at complete rest)

So, the answers are:
- Heartbeat: Decreases
- Breathing: Decreases

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Final Answers:

1. Tick the images: Image 1, Image 4, Image 5
2. Boy playing basketball:
- Heartbeat: Increases
- Breathing: Increases
3. Girl resting after running:
- Heartbeat: Decreases
- Breathing: Decreases

Boxed Final Answer:
\[
\boxed{\text{Image 1, Image 4, Image 5; Increases, Increases; Decreases, Decreases}}
\]