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BiologyClass 10ICSE

During respiration, the exchange of gases takes place in: (a) bronchi (b) alveoli (c) bronchioles (d) trachea

(b) alveoli Alveoli are the pouch-like air sacs at the end of the small bronchioles, which send oxygen to all parts of the body through blood.

BiologyClass 10ICSE

• One of the following organisms can live without oxygen of air. This organism is: (a) Amoeba (b) Yak (c) Yeast (d) Leech

c) Yeast Yeast can live without the oxygen present in the air as it undergoes anaerobic respiration

BiologyClass 10ICSE

Which of the following is not produced during anaerobic respiration in unicellular fungus? (a) C2H5OH (b) H2O (c) CO2 (d) ATP

(b) H2O Anaerobic respiration occurs in the absence of oxygen. Hence water molecule is not released.

BiologyClass 10ICSE

48. a) Why is diffusion insufficient to meet the oxygen requirements of large multicellular organisms like humans? (b) What type of arrangement exists in the bodies of large animals to meet their oxygen requirements adequately? (c) What advantage a terrestrial animal has over an aquatic animal with regard to obtaining oxygen for respiration?

In multicellular organisms like humans the transport of oxygen by diffusion is more as compared to other unicellular organisms. Due to a large number of cells and the huge size of the body the oxygen cannot diffuse quickly into all cells of the body. In unicellular organisms, the size of the organism is small and the cell present is also singular. Hence, diffusion is insufficient to meet the oxygen requirements of large multicellular organisms like humans. In lar

BiologyClass 10ICSE

48. (a) "Respiration is a vital function of the body". Justify the statements. (b) What is the main difference between aerobic respiration and anaerobic respiration? Give one example of each. What type of respiration takes place (i) in yeast, and (ii) in humans?

Respiration is a vital function of the body because it provides energy for carrying out all the life processes that are necessary to keep the organisms alive. Most living things need oxygen to obtain energy from This oxygen reacts with the food molecules present in the body cells and burns them slowly to release energy. This energy is stored as ATP molecules in the cells. The process of releasing energy from food is called respiration. <td width="32

BiologyClass 10ICSE

48. (a) Give the main points of difference between respiration in plants and respiration in animals. (b) Describe the exchange of gases which takes place in the leaves of a plant (a) during daytime, and (b) at night. (c) Which contains more carbon dioxide: exhaled air or inhaled air? Why?

Answer (a) Respiration in plants Respiration in animals Respiration is done individually in all parts of the plant. Respiration is done by a single system. A small amount of gases is transported to all parts of the plant. The gases are transported to all p

BiologyClass 10ICSE

(a) Explain how, the air we breathe in gets cleaned while passing through the nasal passage. (b) Why do the walls of trachea not collapse when there is less air in it? (c) How are oxygen and carbon dioxide exchanged in our body during respiration? (d) How are lungs designed in human beings to maximize the exchange of gases?

The nasal passage plays a vital role in the purification of Nasal passage contains mucus and hair in it. The hair prevents the dust particles entering the respiratory tract and mucus also plays in preventing the fine particles of dust from entering into the track. The walls of the trachea do not collapse when there is less air in it because the trachea is supported by rings of soft bones called cartilage. The alveoli of lungs play a major role in the exchange of The

BiologyClass 10ICSE

Explain how, it would benefit deep-sea divers if humans also had gills.

It would definitely benefit deep-sea divers if humans also had gills. Then the divers would not have carried the oxygen cylinders along with them as they would breathe with the help of dissolved oxygen in water. The divers need have taken much efforts of carrying the cylinders.

BiologyClass 10ICSE

Explain why, plants have low energy needs as compared to animals.

Plants have low energy needs as compared to animals. It&rsquo;s because plants do not move from one place to another. Plants show only tropic movements and movements are at the cellular level. But, in case of animals it is entirely different. Animals move from one place to another in search of food, prey, water, shelter, etc. The energy requirement is more in animals. Hence plants have low energy needs as compared to animals.

BiologyClass 10ICSE

Name the energy currency in the living organisms. When and where is it produced?

The energy currency in living organisms is adenosine triphosphate (ATP). In aerobic respiration process it is produced in cytoplasm and in anaerobic respiration process it is produced in mitochondria of the cell.

BiologyClass 10ICSE

Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

The rate of breathing in aquatic organisms much faster than in terrestrial organisms because aquatic animals breathe from the oxygen dissolved in water. The dissolved oxygen is less as compared to the amount of oxygen present in the atmosphere. Hence, the rate of breathing in aquatic organisms much faster than in terrestrial organisms.

BiologyClass 10ICSE

Why do fishes die when taken out of water?

Fishes die when taken out of water because the respiratory organ that is gills is specialized in such a way that, it can only extract dissolved oxygen from the water and provide it to fish. The gills are not specialised to take oxygen from the air in the surrounding atmosphere. Hence, due to lack of oxygen fishes die when taken out of water.

BiologyClass 10ICSE

(a) What is meant by aquatic animals and terrestrial animals? (b) From where do the aquatic animals and terrestrial animals obtain oxygen for breathing and respiration?

(a) The animals which live in water and have a special organ for respiration are called aquatic animals. Example: Fish, Shark, Octopus etc. The animals which live on land and respire through lungs are called terrestrial animals. Example: Cow, Goat, Tiger etc. (b) The oxygen for aquatic animals is obtained from the oxygen dissolved in water. Water contains two hydrogen and one oxygen molecule. This dissolved oxygen is utilized by the aquatic animals for breathing. The o

BiologyClass 10ICSE

Describe the process of respiration in the following parts of a plant: (a) Root (b) Stem (c) Leaves

The root hair present on the root helps in respiration by The oxygen present in between the soil particles is absorbed by these root hair by diffusion. The carbon dioxide produced in the cells move out through these root hair by the same process of diffusion. The stems of the herbaceous plants contain stomata. The pores present on the stem helps in the exchange of gases and carbon dioxide present in the air diffuses out through the same Lenticels are present in t

BiologyClass 10ICSE

What would be the consequences of deficiency of hemoglobin in our bodies?

Answer The deficiency of hemoglobin causes the following problems in the body: Anemia due to iron deficiency Tiredness Lack of oxygen supply to the body parts Difficulty in breathing

BiologyClass 10ICSE

State the three common features of all the respiratory organs like skin, gills and lungs

The common features of the respiratory organs like skin, gills and lungs are: Adequate surface area to transport oxygen in the organism The exchange of gases and diffusion is easy due to the thin walls of the respiratory organs Enough amount of blood for transporting the gases in the

BiologyClass 10ICSE

Explain why, it is dangerous to inhale air containing carbon monoxide.

Inhalation of carbon monoxide is dangerous because Carbon monoxide combines with hemoglobin and forms carboxyhemoglobin. This carboxyhemoglobin replaces oxygen. Then blood faces the shortage of oxygen. Due to the lack of oxygen, the person will face difficulty in breathing. The person may also die due to this lack of oxygen. So it is dangerous to inhale air containing carbon monoxide.

BiologyClass 10ICSE

Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.

The lungs always contain a residual volume of air so that there is a sufficient amount of oxygen present for oxygen to be absorbed into the blood and carbon dioxide to be released from the blood. The residual volume also functions to keep the alveoli open even after maximum respiration.

BiologyClass 10ICSE

What are the different ways in which glucose is oxidized to provide energy in various organisms? Give one example of each.

The different ways in which glucose is oxidized to provide energy in various organisms are aerobic and anaerobic respiration. Aerobic respiration: The respiration which take place in the presence of oxygen is called aerobic respiration. Example Plants Anaerobic respiration: The respiration which take place in the absence of oxygen is called aerobic respiration. Example Bacteria

BiologyClass 10ICSE

Define breathing. State the differences between breathing and respiration.

The physical mechanism in which an organism takes up oxygen from the air and gives out carbon dioxide is called breathing. Breathing Respiration It is a physical mechanism. It is a biochemical mechanism. Only the exchange of gases takes place.

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