Doubtly
@Doubtly · Joined Feb 2021
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- The breakdown of pyruvate to give carbon dioxide, water and energy takes place in (a) cytoplasm. Correct option is b) mitochondria. 2
- The autotrophic mode of nutrition requires (a) carbon dioxide and water. (b) chlorophyll. Correct option is d) all of the above. 2
- The xylem in plants are responsible for (a) transport of water. (b) transport of food Correct option is a) transport of water. 2
- The kidneys in human beings are a part of the system for (a) nutrition. Correct option is c) excretion. 2
- How is the amount of urine produced regulated? The amount of urine produced depends on the amount of excess water and dissolved wastes present in the body. Some other factors such as habi... 1
- What are the methods used by plants to get rid of excretory products? Plants can get rid of excess of water by transpiration. Waste materials may be stored in the cell vacuoles or as gum and resin, especially i... 1
- Describe the structure and functioning of nephrons. Nephrons are the basic filtering units of kidneys. Each kidney possesses large number of nephrons, approximately 1-1.5 million. The main com... 1
- How is food transported in plants? Phloem transports food materials from the leaves to different parts of the plant. The transportation of food in phloem is achieved by utiliz... 1
- How are water and minerals transported in plants? Water and minerals are transported through xylem cells from soil to the leaves. The xylem cells of roots stem and leaves are interconnected... 1
- What are the components of the transport system in highly organised plants? In highly organised plants, there are two different types of conducting tissues - xylem and phloem. Xylem conducts water and minerals obtain... 1
- Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds? It is necessary to separate oxygenated and deoxygenated blood to maintain efficient supply of oxygen into the body. This system is essential... 1
- What are the components of the transport system in human beings? The main components of the transport system in human beings are the heart, blood, and blood vessels. Heart pumps oxygenated blood throughout... 1
- How are the lungs designed in human beings to maximize the area for exchange of gases? Lungs contain millions of alveoli which provide a surface for the exchange of gases. An extensive network of blood vessels is present in the... 1
- How is oxygen and carbon dioxide transported in human beings? Transport of Oxygen: The respiratory pigments (haemoglobin) present in red blood cells takes up the oxygen from the air to the lungs. They c... 1
- What are the different ways in which glucose is oxidized to provide energy in various organisms? At first glucose (6 carbon molecules) is broken in the cytoplasm of cells of all organisms. This process yields a 3 carbon molecule compound... 1
- What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals obtain oxygen from water. Air contains more O₂ as compared... 1
- How is the small intestine designed to absorb digested food? The small intestine has millions of tiny finger-like projections called villi. These villi increase the surface area for more efficient food... 1
- What is the function of digestive enzymes? Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These... 1