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Q1. Immunize means to:
Immunize means to inject a vaccine or serum into the body to stimulate the immune system and provide protection against a specific disease. Vaccines contain weakened or killed pathogens that trigger the body to produce antibodies without causing the disease itself. This helps the body develop immunity.
Q2. Compost is formed by:
Compost is formed by microbiological processes carried out by bacteria, fungi, and other microorganisms. These organisms break down organic matter like kitchen waste, leaves, and animal manure into humus-rich compost. This is a natural biological process, not chemical or physical.
Q3. Diatoms belong to the class:
Diatoms belong to the class Bacillariophyceae. They are single-celled algae with unique glass-like cell walls made of silica. They are found in both freshwater and marine environments. Rhodophyceae (red algae), Cyanophyceae (blue-green algae), and Chlorophyceae (green algae) are other algal classes.
Q4. Immunity is the ability to:
Immunity is the ability of the body to produce antibodies and defend itself against pathogens like bacteria, viruses, and other harmful microorganisms. The immune system recognizes foreign substances (antigens) and produces antibodies to neutralize them. Respiration, digestion, and circulation are not directly related to immunity.
Q5. Coelenterates have how many openings?
Coelenterates (such as hydra, jellyfish, and corals) have a simple body plan with only one opening. This opening serves as both the mouth and the anus. Food enters and waste exits through the same opening. They have a sac-like body cavity called the coelenteron.
Q6. Compost mainly consists of:
Compost mainly consists of humus, which is the dark, organic-rich material formed from the decomposition of plant and animal matter. Humus improves soil structure, water retention, and nutrient availability. It is the final product of composting.
Q7. Vermicompost improves:
Vermicompost improves soil fertility by adding essential nutrients like nitrogen, phosphorus, and potassium to the soil. It also improves soil structure, aeration, and water-holding capacity. This helps plants grow better and reduces the need for chemical fertilizers.
Q8. Compost is rich in:
Compost is rich in humus, which is the organic component of soil formed by the decomposition of plant and animal materials. Humus contains nutrients that are essential for plant growth and improves soil health. Compost does not contain plastics, metals, or harmful chemicals.
Q9. Selectively permeable membrane allows:
A selectively permeable membrane allows only some substances to pass through while blocking others. It permits the passage of small molecules like water and certain ions, but prevents larger molecules from crossing. This property is essential for processes like osmosis and maintaining cell homeostasis.
Q10. Antigen is a substance that:
An antigen is a substance (often a protein or polysaccharide) that triggers the immune system to produce antibodies against it. Antigens are typically found on the surface of pathogens like bacteria and viruses. When the body detects an antigen, it mounts an immune response to eliminate it.
Q11. Glass-like cell walls are seen in:
Glass-like cell walls are seen in diatoms. Their cell walls are composed of silica, which gives them a glass-like appearance. These cell walls are called frustules and are highly ornamented. They are unique to diatoms and are not found in fungi, bacteria, or protozoa.
Q12. Halophiles are:
Halophiles are organisms that thrive in environments with high salt concentrations, such as salt lakes and salt pans. They belong to the group Archaebacteria and have adaptations that allow them to survive in extreme saline conditions. “Halo” means salt, and “phile” means loving.
Q13. Biodegradable materials are those which:
Biodegradable materials are those that can be decomposed by biological processes (by microorganisms like bacteria and fungi). These materials break down naturally into simpler substances that can be absorbed by the environment. Examples include food waste, paper, and plant matter.
Q14. Homeostasis helps to keep conditions:
Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in the external environment. It helps keep conditions such as temperature, pH, and water balance constant, which is essential for proper functioning of cells and organs.
Q15. Vermicompost is produced by:
Vermicompost is produced by earthworms. The process of vermicomposting involves using earthworms to break down organic waste. The worms consume the waste and excrete it as nutrient-rich castings (worm poop) that form excellent compost. This compost is rich in nutrients and beneficial microorganisms.
Q16. Vermicomposting helps in:
Vermicomposting helps in waste management by converting organic waste into useful compost. It is an eco-friendly way to dispose of kitchen and garden waste, reducing the amount of waste sent to landfills. It also produces nutrient-rich compost that can be used in gardens and farms.
Q17. Diatom cell walls are composed of:
Diatom cell walls are composed of silica, which is a glass-like substance. These cell walls are called frustules and provide structural support and protection. The silica content makes them very hard and resistant to decay. Chitin is found in fungi and insects, cellulose in plant cell walls.
Q18. Antibodies are produced as a defense against:
Antibodies are produced by the immune system as a defense against antigens. Antigens are foreign substances (like parts of bacteria or viruses) that trigger an immune response. Antibodies bind to antigens and neutralize them, marking them for destruction by other immune cells.
Q19. Osmosis occurs between:
Osmosis occurs between two solutions that are separated by a selectively permeable membrane. It is the movement of water molecules from a region of lower solute concentration to a region of higher solute concentration. This process occurs in liquid solutions, not gases or solids.
Q20. Osmosis is a process that occurs across a:
Osmosis occurs across a selectively permeable membrane that allows water molecules to pass through but prevents larger solute particles from crossing. This type of membrane is essential for osmosis to take place. Cell walls are not always selectively permeable in the same way as cell membranes.
Q21. Methanogens belong to:
Methanogens belong to the group Archaebacteria. They are microorganisms that produce methane gas as a byproduct of their metabolism. They are found in environments like marshes, swamps, and the digestive tracts of ruminants. They are among the oldest life forms on Earth.
Q22. Diatoms contribute mainly to:
Diatoms contribute mainly to fossil fuel formation. Their silica-rich cell walls accumulate on the ocean floor over millions of years, forming diatomaceous earth. This material can become part of sedimentary rocks, and the organic matter from diatoms contributes to the formation of petroleum deposits.
Q23. Homeostasis helps in maintaining:
Homeostasis helps in maintaining internal balance within the body. It regulates factors like body temperature, pH, water balance, and blood glucose levels. This stable internal condition is essential for the proper functioning of cells and organs.
Q24. Cannabinoids are derived from:
Cannabinoids are derived from Cannabis sativa, commonly known as marijuana or hemp. These compounds, including THC (tetrahydrocannabinol), interact with cannabinoid receptors in the brain and produce psychoactive effects. Nicotiana tabaccum is tobacco, Erythroxylum coca is coca, and Papaver somniferum is the poppy plant.
Q25. Symbiosis is a relationship where:
Symbiosis is a relationship where both organisms benefit from each other. This is called mutualism. Examples include lichens (fungus and algae) and nitrogen-fixing bacteria in the roots of legumes. Both partners derive advantages from the association.
Q26. Homeostasis refers to maintenance of:
Homeostasis refers to the maintenance of stable internal conditions in the body. This includes factors like temperature, pH, hydration, and blood glucose levels. Maintaining these conditions is vital for survival and proper functioning of the body.
Q27. Symbiotic association is generally:
Symbiotic association is generally beneficial for the organisms involved. In mutualistic symbiosis, both partners benefit. The association is often long-lasting and essential for the survival of one or both organisms. It is not competitive or temporary in a harmful sense.
Q28. Coelenterates have a:
Coelenterates have a bag-shaped (or sac-like) body with a single opening called the mouth. The body is made up of two layers of cells (ectoderm and endoderm) with a jelly-like mesoglea in between. Examples include hydra, jellyfish, and sea anemones.
Q29. Immunity protects the body from:
Immunity protects the body from harmful microorganisms such as bacteria, viruses, fungi, and parasites. The immune system recognizes these foreign invaders and mounts a defense to eliminate them. It does not protect against oxygen, nutrients, or hormones.
Q30. Diatoms are:
Diatoms are single-celled algae. They are a type of phytoplankton and are found in marine and freshwater environments. They are known for their unique silica cell walls and are an important part of the aquatic food chain. They are not bacteria, fungi, or multicellular plants.
Q31. Osmosis involves movement of:
Osmosis involves the movement of water molecules across a selectively permeable membrane. It is the movement of water from a region of lower solute concentration to a region of higher solute concentration. Salts, sugars, and proteins are solutes that do not move in osmosis.
Q32. Coca alkaloids are obtained from:
Coca alkaloids, including cocaine, are obtained from Erythroxylum coca, the coca plant. These alkaloids have stimulant effects on the central nervous system. Papaver somniferum is the poppy plant (opioids), Cannabis sativa is marijuana (cannabinoids), and Nicotiana tabaccum is tobacco.
Q33. Immunization helps to:
Immunization helps to prevent disease by stimulating the body’s immune system to develop immunity against specific pathogens. It does not cure diseases instantly or improve digestion or increase body size. Vaccines are given to prevent diseases before they occur.
Q34. Opioids are obtained from which plant?
Opioids are obtained from Papaver somniferum, the poppy plant. This plant produces morphine, codeine, and thebaine, which are used to make heroin and other opioid drugs. Cannabis sativa gives cannabinoids, Erythroxylum coca gives cocaine, and Nicotiana tabaccum gives nicotine.
Q35. Antibody is a:
An antibody is a protein produced by the immune system (specifically by B cells) in response to an antigen. Antibodies bind to antigens and help neutralize or destroy them. They are not lipids, carbohydrates, or hormones.
Q36. Vaccines help in developing:
Vaccines help in developing artificial immunity. This type of immunity is acquired when a vaccine introduces a harmless part of a pathogen into the body, triggering an immune response without causing disease. The immune system remembers the pathogen and can fight it off in the future.
Q37. Archaebacteria are:
Archaebacteria are primitive prokaryotes. They are single-celled organisms that lack a nucleus and other membrane-bound organelles. They are among the oldest life forms on Earth and are known for living in extreme environments. They are not eukaryotes, parasites, or multicellular organisms.
Q38. Vermicompost is rich in:
Vermicompost is rich in humus, which is the dark, nutrient-rich organic matter produced by the breakdown of organic waste by earthworms. Humus improves soil fertility and water retention. It does not contain plastics, harmful chemicals, or sand.
Q39. Biodegradable waste is broken down by:
Biodegradable waste is broken down by living organisms, such as bacteria, fungi, and earthworms. These microorganisms use the waste as food and convert it into simpler substances like humus, water, and gases. This is a natural biological process.
Q40. Diatoms are found in:
Diatoms are found in both marine and freshwater environments. They are a major component of phytoplankton and are found in oceans, seas, lakes, rivers, and ponds. They are not limited to one type of water body.
Q41. Tobacco is obtained from:
Tobacco is obtained from the leaves of Nicotiana tabaccum, a plant in the Solanaceae family. This plant is cultivated for its leaves, which are dried and processed into tobacco products like cigarettes and cigars. It contains the alkaloid nicotine.
Q42. Which plant is the source of opioids?
Papaver somniferum (the poppy plant) is the source of opioids. The latex from its seed pods contains morphine, codeine, and other alkaloids that are used to produce opioid drugs. Cannabis sativa is for cannabinoids, Nicotiana tabaccum for tobacco, and Erythroxylum coca for cocaine.
Q43. Antibodies are found in:
Antibodies are found in the blood and other body fluids. They are part of the humoral immune response and circulate in the blood plasma, where they can bind to antigens and neutralize them. Antibodies are not found in hair, bone, or skin.
Q44. Immunity is part of the:
Immunity is part of the immune system. The immune system is a complex network of cells, tissues, and organs that work together to defend the body against pathogens. It includes white blood cells, antibodies, the lymphatic system, and other components.
Q45. Antibodies protect the body against:
Antibodies protect the body against invading substances, specifically antigens such as bacteria, viruses, and other foreign materials. They bind to these invaders and neutralize them, marking them for destruction by other immune cells. They do not act against enzymes, hormones, or nutrients.
Q46. Halophiles belong to:
Halophiles belong to Archaebacteria. They are salt-loving microorganisms that thrive in high-salt environments like salt lakes and salt pans. They are prokaryotes with unique adaptations that allow them to survive in extreme saline conditions.
Q47. Osmosis does not require:
Osmosis does not require energy. It is a passive process that occurs naturally due to the concentration gradient of water across a selectively permeable membrane. Water moves from a region of lower solute concentration to higher solute concentration without the need for external energy.
Q48. Composting deals with:
Composting deals with organic waste, such as kitchen scraps, garden waste, and plant materials. This type of waste is biodegradable and can be broken down by microorganisms to form compost. Metallic, electronic, and plastic waste are not suitable for composting.
Q49. Coelenterates are:
Coelenterates are invertebrates. They are animals without a backbone. They belong to the phylum Cnidaria and include organisms like jellyfish, hydra, and sea anemones. They are not reptiles, vertebrates, or mammals.
Q50. Symbiosis occurs between organisms of:
Symbiosis occurs between organisms of different species. It is an interaction between two different organisms living together in close association. This can be mutualistic (both benefit), commensalistic (one benefits, the other is unaffected), or parasitic (one benefits, the other is harmed). The organisms are not necessarily of the same genus or family.