Questions : 06 Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans? Ans :- Multicellular organisms such as humans possess complex body designs. They have specialised cells and tissues for performing various necessary functions of the body such as intake of food and oxygen. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion cannot meet their oxygen requirements. Questions :07 What criteria do we use to decide whether something is alive? Ans:- Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not. Questions : 08 What are outside raw materials used for an organism...
Q.1. Write difference between autotropic and heterotrophic nutrition. Ans:- i) Autotropic nutrition - ➡️Living things makes their own food themselves by the help of carbon dioxide and water. ➡️Presence of green pigment (chlorophyll) which is necessary. ➡️Food is prepared in presence of sun light. ➡️All green plants and some type of bacteria have this type of nutrition. ii) Heterotrophic nutrition - ➡️It depends on autotrophs. Food is broken down with the help of enzymes*. ➡️In this nutrition green pigment is not required. ➡️Organics make their food all times. ➡️All animals and fungi have this type of nutrition. Q.2.Where do plants get each of the raw materials required for photosynthesis? Ans- The following raw materials are required for photosynthesis: ➡️The raw material CO2 enters from the atmosphere through stomata. ➡️Water is absorbed from the soil by the plant roots. ➡️Sunlight, an important component to manufacture food, is absorbed by the c...
Question - 05 How is the small intestine designed to absorb (अवशोषित) digested food? Ans- The small intestine has millions of tiny fingers - like projections (उठा हुआ भाग) which is called villi*.These villi increase the surface are for more efficient (कुशलता से ) food absorption. Within these villi, many blood vessels are present that absorb the digested food and carry it to the blood stream(धारा /बहना). From the blood stream, the absorbed food is delivered to each and every cell in the body. Note point :- What is villi? Or Write the function of villi. Ans:- ➡️It is small finger like projections which is found inside of the small intestine. ➡️It increase the surface area of the small intestine which help to absorb. ➡️Each villus( sing-villus) has a network of thin and small blood vessels close to its surface. ➡️The surface of the villi absorbs the digested food materials. ➡️It is the part of wall of the small intestine. ➡️System - Digestive syst...
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