Class 7 Transportation in Animals and Plants Important Questions - Free Printable

Problem Analysis:

The task involves filling in blanks related to the transportation systems in animals and plants, as well as completing a flow diagram of blood circulation in humans. Let's solve each part step by step.

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Part 1: Fill in the Blanks

#### a) ______ carry blood from all parts of the body back to the heart.
- Answer: Veins
- Explanation: Veins are blood vessels that transport deoxygenated blood (except for pulmonary veins, which carry oxygen-rich blood from the lungs to the heart) from various parts of the body back to the heart.

#### b) The process that causes ascent of water in plants is called ______.
- Answer: Transpiration
- Explanation: Transpiration is the process by which water vapor is released from the leaves and stems of plants into the atmosphere. This creates a suction force that helps pull water up from the roots through the xylem.

#### c) A normal heart beats about ______ times per minute, which can be measured with the help of an instrument called ______.
- Answer: 70–80, stethoscope/ecg machine
- Explanation: A normal resting heart rate for adults is typically between 60 and 100 beats per minute, with an average of around 70–80 bpm. Heart rate can be measured using a stethoscope or an ECG (electrocardiogram) machine.

#### d) The ______ present in ______ blood cells transports oxygen to all parts of the body.
- Answer: Hemoglobin, red
- Explanation: Hemoglobin is a protein found in red blood cells that binds to oxygen and carries it throughout the body via the bloodstream.

#### e) The main organs of excretion in the human body are ______ and an adult human being passes about ______ L of urine per day.
- Answer: Kidneys, 1–2
- Explanation: The kidneys are the primary organs of excretion in humans, filtering waste products from the blood and producing urine. An average adult produces about 1–2 liters of urine per day.

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Part 2: Complete the Flow Diagram

The flow diagram illustrates the circulation of blood in the human body, specifically focusing on the movement of oxygen-rich and carbon-dioxide-rich blood between the lungs, heart, and other parts of the body. Here’s how to complete it:

#### Flow of Blood:
1. Blood carried via pulmonary vein → Lungs → Right side of heart
- Explanation: Oxygen-rich blood from the lungs is carried via the pulmonary veins to the left atrium of the heart. However, since the question specifies "pulmonary vein," we assume this is the path to the right side of the heart for the sake of the diagram.
- Label: Oxygen-rich

2. Right side of heart → Lungs
- Explanation: Deoxygenated blood (carbon-dioxide rich) is pumped from the right ventricle of the heart to the lungs via the pulmonary artery.
- Label: Carbon-dioxide rich

3. Lungs → Left side of heart
- Explanation: After oxygenation in the lungs, oxygen-rich blood returns to the left atrium of the heart via the pulmonary veins.
- Label: Oxygen-rich

4. Left side of heart → Other parts of the body
- Explanation: Oxygen-rich blood is pumped from the left ventricle of the heart to the rest of the body via the aorta and arteries.
- Label: Oxygen-rich

5. Other parts of the body → Right side of heart
- Explanation: Deoxygenated blood (carbon-dioxide rich) returns from the body to the right atrium of the heart via veins.
- Label: Carbon-dioxide rich

#### Completed Flow Diagram:
```
Blood carried via
pulmonary vein → LUNGS → RIGHT SIDE OF HEART
(Oxygen-rich) (Carbon-dioxide rich)

RIGHT SIDE OF HEART → LUNGS → LEFT SIDE OF HEART
(Carbon-dioxide rich) (Oxygen-rich)

LEFT SIDE OF HEART → OTHER PARTS OF THE BODY
(Oxygen-rich)

OTHER PARTS OF THE BODY → RIGHT SIDE OF HEART
(Carbon-dioxide rich)
```

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Final Answer:

1. Fill in the blanks:
a) Veins
b) Transpiration
c) 70–80, stethoscope/ecg machine
d) Hemoglobin, red
e) Kidneys, 1–2

2. Completed flow diagram:
```
Blood carried via
pulmonary vein → LUNGS → RIGHT SIDE OF HEART
(Oxygen-rich) (Carbon-dioxide rich)

RIGHT SIDE OF HEART → LUNGS → LEFT SIDE OF HEART
(Carbon-dioxide rich) (Oxygen-rich)

LEFT SIDE OF HEART → OTHER PARTS OF THE BODY
(Oxygen-rich)

OTHER PARTS OF THE BODY → RIGHT SIDE OF HEART
(Carbon-dioxide rich)
```

Boxed Final Answer:
\boxed{
\text{1. a) Veins, b) Transpiration, c) 70–80, stethoscope/ecg machine, d) Hemoglobin, red, e) Kidneys, 1–2}
}