1. Why does a plant need to conduct water?
2. What is transpiration?
3. What is the direction of transport in xylem and in phloem?
4. What do you mean by vascular bundle?
5. What is the main difference between an artery and a vein?
6. Amoeba lacks a specialised transport system. Why?
7. State the function of heart.
8. What role does the red pigment haemoglobin play in our body?
9. What will happen if there are no WBCs in the blood?
10. Why is blood needed by all the parts of a living animal body?
Answers
Answer:
Water enters a plant through its stem and travels up to its leaves. When a plant is properly hydrated, there is enough water pressure to make the leaves strong and sturdy; when a plant doesn't get enough water, the pressure inside the stems and leaves drops and they wilt. Plants also need water for photosynthesis.
Ans_1. Plants need water to absorb nutrients from the soil. Water enters a plant's stem and travels up to its leaves, which is where photosynthesis actually takes place. Moreover, water is essential for the seeds to germinate to become a plant.
Ans_2. the process of water passing out from the surface of a plant or leaf.
Ans_3. Comparison of transport in the xylem and phloem
Xylem Phloem
Type of transport Physical process Requires energy
Substances transported Water and minerals Products of photosynthesis including sugars and amino acids dissolved in water
Direction of transport Upwards Upwards and downwards
Ans_4. a strand of conducting vessels in the stem or leaves of a plant, typically with phloem on the outside and xylem on the inside.
Ans_5. Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation. Arteries and veins are two of the body's main type of blood vessels.
Ans_6. This is because a transport system consists of many cells yet an amoeba is unicellular. This is because a transport system consists of many cells yet an amoeba is an unicelluar . ... They lack any speacialised system for transport. They have food vacule which help in transporting food in whole body.
Ans_7. It's the muscle at the centre of your circulation system, pumping blood around your body as your heart beats. This blood sends oxygen and nutrients to all parts of your body, and carries away unwanted carbon dioxide and waste products.
Ans_8. Hemoglobin is a red protein and pigment inside red blood cells that transports oxygen around the body. The hemoglobin is responsible for the blood's color. One hemoglobin molecule joins to four oxygen molecules. ... These cells need oxygen to produce energy from digested food.
Ans_9. If you had no white cells, you would get lots of very serious infections. White blood cells can find germs that enter your body and destroy them, which keeps them from making you sick. Some white blood cells make antibodies, which are special molecules that can stick to germs and make them harmless.
Ans_10 Blood brings oxygen and nutrients to all the parts of the body so they can keep working. Blood carries carbon dioxide and other waste materials to the lungs, kidneys, and digestive system to be removed from the body. Blood also fights infections, and carries hormones around the body.