Life Processes: Class 10 Science Q&A · Page 5
107 free answers on Life Processes (Science) for Class 10 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 10CBSE
The autotrophic mode of nutrition requires
(a) carbon dioxide and water (b) chlorophyll (c) sunlight (d) all of the above Solution: The autotrophic mode of nutrition requires carbon dioxide, water, chlorophyll and sunlight from the preparation of food. Hence, the answer is (d) all of the above.
- ScienceClass 10CBSE
The xylem in plants is responsible for (a) transport of water (b) transport of food (c) transport of amino acids (d) transport of oxygen
Solution: In plants, the Xylem is responsible for the transport of water. Hence, the answer is (a
- ScienceClass 10CBSE
1. The kidneys in human beings are a part of the system for (a) nutrition (b) respiration (c) excretion (d) transportation
Solution: The answer is (c) excretion The excretory system of human beings (Fig. 6.13) includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra. Kidneys are located in the abdomen, one on either side of the backbone. Urine produced in the kidneys passes through the ureters into the urinary bladder, where it is stored until it is released through the urethra.
- ScienceClass 10CBSE
How is the amount of urine produced regulated?
Solution: The amount of urine produced depends on the amount of excess water and dissolved waste present in the body. Other factors may be the environment and the ADH hormone, which regulates the production of urine.
- ScienceClass 10CBSE
What are the methods used by plants to get rid of excretory products?
Plants can get rid of excess water by transpiration. For other wastes, plants use the fact that many of their tissues consist of dead cells and that they can even lose some parts, such as leaves. Many plant waste products are stored in cellular vacuoles. Waste products may be stored in leaves that fall off. Other waste products are stored as resins and gums, especially in old xylem. Plants also excrete some waste substances into the soil around them.
- ScienceClass 10CBSE
How are water and minerals transported in plants?
Xylem parts of the tracheids and vessels of roots, stems and leaves are interconnected to form a continuous system of water-conducting channels that reaches all parts of the plant. Transpiration creates a suction pressure which forces water into the xylem cells of roots. After this, there will be a steady movement of water from the root xylem to all parts of the plant connected through conducting interconnected water-conducting channels.
- ScienceClass 10CBSE
What are the components of the transport system in highly organised plants?
Solution: There are two types of conducting tissues in highly organised plants that carry out the transport system 1) Xylem 2) Phloem. Xylem conduct water and minerals from roots to the rest of the plant parts. Similarly, Phloem transports food materials from the leaf to other parts of the plant.
- ScienceClass 10CBSE
Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
Solution: Mammals and birds are warm-blooded animals which keep their body temperature constant irrespective of the environment they live. This process requires a lot of oxygen for more cellular respiration so that warm-blooded animals produce more energy to balance their body temperature. Hence, it is very important for warm-blooded animals to separate oxygenated and deoxygenated blood to keep their circulatory system efficient.
- ScienceClass 10CBSE
What are the components of the transport system in human beings? What are the functions of these components?
The heart, blood and blood vessels are the main components of the transport system in human beings. Functions of these components Heart The heart pumps oxygenated blood throughout the body. It receives deoxygenated blood from the various body parts and sends impure blood to the lungs for oxygenation. Blood Blood transports oxygen, nutrients, CO2, and nitrogenous wastes. Blood vessels</st
- ScienceClass 10CBSE
How are the lungs designed in human beings to maximise the area for the exchange of gases?
Solution: The lungs are an important part of the body. The passage inside the lungs divides into smaller and smaller tubes, which finally terminate in balloon-like structures called alveoli. The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli usually contain an extensive network of blood vessels. We know that when we breathe in, we lift our ribs, flatten our diaphragm and the chest cavity becomes larger.<
- ScienceClass 10CBSE
How are oxygen and carbon dioxide transported in human beings?
Oxygen and Carbon dioxide are transported in human beings via the bloodstream. Oxygen is carried to the cells, whereas carbon dioxide is carried away from the cells. The exchange of gases takes place between the alveoli of the lungs and the surrounding blood capillaries. Oxygen is absorbed by the blood capillaries from the lungs’ alveoli by diffusion, while carbon dioxide is absorbed by the lungs’ alveoli from the blood capillaries by diffusion.
- ScienceClass 10CBSE
1. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Solution: Terrestrial organisms breathe by using atmospheric oxygen, whereas aquatic organisms take oxygen dissolved in water. The oxygen level is high in the atmosphere when compared to oxygen in the water. Hence, terrestrial organisms need not breathe fast to obtain organisms, whereas aquatic organisms need to breathe faster to get the required oxygen.
- ScienceClass 10CBSE
What is the function of digestive enzymes?
Solution: Digestive enzymes break complex food molecules into simpler ones. This will make the food absorption process easy and effective. Absorbed food is transported to all parts of the body by the blood.
- ScienceClass 10CBSE
What is the role of the acid in our stomach?
HCl present in the stomach dissolves food particles and creates an acidic medium. In an acidic environment, protein-digesting enzymes, pepsinogen, are converted into pepsin. HCl in the stomach also acts as a protective barrier against many disease-causing pathogens.
- ScienceClass 10CBSE
Where do plants get each of the raw materials required for photosynthesis?
Solution: Plants require the following raw material for photosynthesis: CO2 is obtained from the atmosphere through stomata Water is absorbed by plant roots from the soil. Sunlight is an essential raw material for photosynthesis Nutrients are obtained by soil by plant roots
- ScienceClass 10CBSE
What are the differences between autotrophic nutrition and heterotrophic nutrition?
Solution: Autotrophic Nutrition Heterotrophic Nutrition Organism prepares its own food and is not dependent on any other organism. An organism that does not prepare its own food and is dependent on other organisms for food. Food is prepared from CO2, water, and sunlight. Food cannot be p
- ScienceClass 10CBSE
What processes would you consider essential for maintaining life?
Solution: Life processes such as respiration, digestion, excretion, circulation and transportation are essential for maintaining life.
- ScienceClass 10CBSE
What criteria do we use to decide whether something is alive?
Solution: Walking, breathing, growth and other visible changes can be used to determine whether something is alive or dead. However, some living things will have changes that are not visible to our eye; Hence, the presence of the life process is a fundamental criterion to decide whether something is alive.
- ScienceClass 10CBSE
Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
Multi-cellular organisms like humans have very big bodies and require a lot of oxygen to diffuse into the body quickly in order to meet the oxygen requirement. Diffusion is a slow process which will take a lot of time to circulate oxygen to all the body cells. Because of its slow nature, diffusion is insufficient to meet the oxygen requirements of multicellular organisms like humans.
- ScienceClass 10All
What is the difference between photosynthesis and respiration?
Photosynthesis and cellular respiration are two fundamental processes in living organisms, especially in plants and some bacteria. Here are five key differences between photosynthesis and respiration: Function: Photosynthesis: This process occurs in the chloroplasts of plant cells and some bacteria. Its primary function is to convert light energy into chemical energy (glucose) by capturing sunlight and using it to synthesize organic compounds, releasing oxygen as a byproduct.<