10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Nutrition in Plants- 1
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Detailed Solution for Test: Nutrition in Plants- 1 - Question 4
Answer: A. Grows in soils which lack in nitrogen. Explanation:
Nutrient-poor soils: Pitcher plants are typically found in environments where the soil is low in essential nutrients, particularly nitrogen. This lack of nitrogen makes it difficult for plants to grow and thrive.
Carnivorous adaptation: To survive in these nutrient-poor environments, pitcher plants have evolved to become carnivorous, trapping and digesting insects to obtain the necessary nitrogen and other nutrients that are scarce in the soil.
Insect trapping mechanism: The pitcher plant has a unique structure called a "pitfall trap," which is a modified leaf in the shape of a pitcher. This structure is filled with a liquid that attracts insects. Once inside, the insects are unable to escape due to the slippery walls of the pitcher and eventually drown in the liquid.
Digestion and nutrient absorption: The drowned insects are then broken down by enzymes and other substances in the liquid, releasing the nutrients, such as nitrogen, which the pitcher plant absorbs to supplement its nutritional needs.
Pitcher plant grows in the soil which is deficient in Nitrogen, fornitrogensources it traps and digests the insects.
It carries out photosynthesis to produce carbohydrates.
Which of the following component of food provide us the majority of energy?
Detailed Solution for Test: Nutrition in Plants- 1 - Question 5
Carbohydrates as the Major Energy Source
Energy Provider: Carbohydrates are the body's primary source of energy, providing 4 calories per gram. They are broken down into glucose, which is used to fuel cellular activities and support various bodily functions.
Quick and Efficient: The body can easily and quickly convert carbohydrates into energy, making them an efficient energy source, particularly during physical activities and exercise.
Stored Energy: Excess carbohydrates that are not immediately used for energy can be stored in the liver and muscles as glycogen. This stored energy can be later utilized when the body needs it, such as during periods of fasting or intense exercise.
Protein Conservation: An adequate supply of carbohydrates prevents the body from using proteins for energy, allowing them to be used for their primary functions, such as building and repairing tissues.
Types of Carbohydrates: Carbohydrates are found in various forms, such as simple sugars (fruits, milk, and sugar) and complex carbohydrates (whole grains, legumes, and starchy vegetables). Both types contribute to the body's energy needs, with complex carbohydrates providing a more sustained energy source.
Other Components of Food
Proteins: While proteins can provide energy (4 calories per gram), their primary role is to build and repair body tissues, synthesize enzymes and hormones, and support immune function.
Minerals: Minerals are essential for various bodily functions, such as maintaining strong bones, regulating heartbeat, and supporting nerve function. They do not provide energy.
Vitamins: Vitamins are essential for numerous metabolic processes and support overall health. However, they do not directly provide energy.
In conclusion, carbohydrates are the main component of food that provides the majority of energy for our bodies, making them the correct answer (A).
In non-green plants and animals mode of nutrition is:
Detailed Solution for Test: Nutrition in Plants- 1 - Question 6
The process by which living organism obtains their food is called the mode of nutrition.
In non-green plants and animals mode of nutrition is heterotrophic as they obtain food from other plants or animals.
The bacterium which provides nitrogen to the leguminous plants is:
Detailed Solution for Test: Nutrition in Plants- 1 - Question 7
Explanation of the answer:
- Nitrogen-fixing bacteria: Certain bacteria have the ability to convert atmospheric nitrogen into a form that is usable by plants. These bacteria are known as nitrogen-fixing bacteria.
- Leguminous plants: Leguminous plants are a family of plants that includes beans, peas, lentils, and other legumes. These plants have a unique ability to form a symbiotic relationship with nitrogen-fixing bacteria.
- Rhizobium: Rhizobium is a genus of Gram-negative, nitrogen-fixing bacteria. They form nodules on the roots of leguminous plants, where they convert atmospheric nitrogen into ammonia, which the plant can then use for growth.
- Symbiotic relationship: The relationship between leguminous plants and Rhizobium bacteria is mutually beneficial. The plant provides the bacteria with carbohydrates and a protected environment, while the bacteria provide the plant with a source of nitrogen, which is essential for growth.
In conclusion, the bacterium which provides nitrogen to leguminous plants is Rhizobium. This symbiotic relationship allows leguminous plants to obtain nitrogen from the bacteria, which is essential for their growth and development.The plants are not able to take nitrogen directly from the air so the rhizobium converts nitrogen into ammonia for plants.
Detailed Solution for Test: Nutrition in Plants- 1 - Question 9
Explanation of the answer:
- Small pores present on the leaves
- Facilitate gas exchange between the plant and the atmosphere
- Consist of two specialized cells called guard cells
- Regulate the opening and closing of the stomatal pore, which allows the movement of gases and water vapor
- Play a critical role in photosynthesis, respiration, and transpiration processesStomata are the small pores present on the leaves of the plants. It helps the plant in the exchange of gasses and transpiration.
The ultimate source of energy for all living organisms is:
Detailed Solution for Test: Nutrition in Plants- 1 - Question 10
The Sun is the major source of energy for organisms and the ecosystems of which they are a part.
Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs.
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