Class 7 Exam > Class 7 Notes > Science Class 7 (Old NCERT) > Unit Test: Transport in Animals and Plants
Unit Test: Transport in Animals and Plants | Science Class 7 (Old NCERT) PDF Download
Time: 1 hour
Maximum Marks: 30
Attempt all questions.
- Question numbers 1 to 5 carry 1 mark each.
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question numbers 12 & 13 carry 5 marks each.
Q1: Which component of blood is responsible for transporting oxygen? (1 Mark)
(a) White blood cells
(b) Red blood cells
(c) Platelets
(d) Plasma
Q2: What is the function of platelets in blood? (1 Mark)
Q3: Name the blood vessel that carries oxygenated blood from the lungs to the heart. (1 Mark)
Q4: Which plant vascular tissue is responsible for transporting food? (1 Mark)
(a) Xylem
(b) Phloem
(c) Stomata
(d) Root hairs
Q5: What is the function of the kidneys in the excretory system? (1 Mark)
Q6: Differentiate between arteries and veins. (2 Marks)
Q7: What is transpiration, and how does it help plants? (2 Marks)
Q8: How does sweating help in cooling the human body? (2 Marks)
Q9: Explain the role of hemoglobin in the transport of gases in the body. (3 Marks)
Q10: Describe how the structure of the heart prevents the mixing of oxygen-rich and oxygen-poor blood. (3 Marks)
Q11: How do aquatic and terrestrial animals excrete waste differently? (3 Marks)
Q12: Explain the process of urine formation in humans. (5 Marks)
Q13: How does the circulatory system work in coordination with the respiratory system to transport oxygen in the body? (5 Marks)
The document Unit Test: Transport in Animals and Plants | Science Class 7 (Old NCERT) is a part of the Class 7 Course Science Class 7 (Old NCERT).
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FAQs on Unit Test: Transport in Animals and Plants - Science Class 7 (Old NCERT)
| 1. What are the main transport systems in animals and how do they function? |  |
Ans. In animals, the main transport system is the circulatory system, which includes the heart, blood, and blood vessels. The heart pumps oxygenated blood from the lungs to the body and returns deoxygenated blood from the body back to the lungs for oxygenation. Blood vessels, including arteries, veins, and capillaries, facilitate the movement of blood throughout the body, ensuring that nutrients, gases, and waste products are efficiently transported.
| 2. How do plants transport water and nutrients? | |
Ans. Plants transport water and nutrients primarily through two systems: the xylem and phloem. The xylem carries water and dissolved minerals absorbed from the soil upward from the roots to the leaves, where photosynthesis occurs. The phloem transports the products of photosynthesis, such as sugars, from the leaves to other parts of the plant, including roots and fruits, ensuring that all parts of the plant receive the necessary nutrients for growth and development.
| 3. What role does the heart play in the transport system of animals? | |
Ans. The heart acts as the central pump in the circulatory system of animals. It consists of four chambers (two atria and two ventricles) that work together to ensure efficient blood circulation. The right side of the heart receives deoxygenated blood from the body and pumps it to the lungs for oxygenation, while the left side receives oxygenated blood from the lungs and pumps it to the rest of the body. This dual pumping action maintains a continuous flow of blood, supporting the transport of oxygen, nutrients, and waste products.
| 4. What is the significance of transpiration in plants? | |
Ans. Transpiration is the process by which water evaporates from the surface of leaves and stems. It is significant for several reasons: it helps maintain the flow of water and nutrients from the roots to the leaves through the xylem, cools the plant, and creates a negative pressure that aids in the uptake of water and minerals from the soil. Additionally, transpiration plays a crucial role in the water cycle, contributing to atmospheric moisture.
| 5. How do adaptations in the transport systems of animals and plants enhance their survival? | |
Ans. Adaptations in transport systems enhance survival by improving efficiency in nutrient and gas exchange. For example, animals have developed a closed circulatory system which allows for faster transport of blood and nutrients, enabling quick responses to environmental changes. Similarly, in plants, adaptations like deep root systems and specialized vascular tissues allow them to efficiently absorb water and nutrients, even in challenging environments. These adaptations ensure that both animals and plants can thrive in diverse habitats.
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