Constructing dams for hydroelectric power
Introducing invasive species for pest control
Clear-cutting forests for timber extraction
Establishing marine protected areas
Correct answer is D
Ecological management and conservation involve strategies and practices aimed at preserving and protecting natural ecosystems and their biodiversity. Among the options provided, the establishment of marine protected areas is an example of such management and conservation through a biological association.
Which of the following are components of the skeletal system in humans?
Cartilage and blood vessels
Ligaments and tendons
Muscles and nerves
Bones and joints
Correct answer is D
The skeletal system in humans is composed of bones and joints. Bones and joints are the primary components of the human skeletal system.
Which of the following is an example of physiological variation in organisms?
Variation in blood pressure among individuals
Variation in beak shape among finches
Differences in fur color in rabbits
Variation in leaf shape in plants
Correct answer is A
Physiological variation refers to differences in physiological traits or functions among individuals within a species. Blood pressure is a physiological parameter that can vary among individuals based on factors such as genetics, health conditions, lifestyle, and environmental influences. Physiological variation encompasses variations in functions, processes, and internal characteristics of organisms, such as metabolic rates, hormone levels, enzyme activities, blood parameters, and other physiological traits.
A biome characterized by hot summer, warm winter and treeless vegetation is
Steppe grasslands
Temperate deserts
Savannah grassland
Tropical deserts
Correct answer is A
A biome characterized by hot summer, warm winter and treeless vegetation is the Steppe grassland. Steppe grasslands are characterized by grassy plains without trees apart from those near rivers and lakes. The summers can be hot, sometimes 40°C (104 °F) or more, but winters are cold, with temperatures often falling below freezing.
Which of the following is a characteristic feature of Kingdom Plantae?
Presence of chloroplasts
Ability to perform photosynthesis
Lack of cell walls
Heterotrophic mode of nutrition
Correct answer is A
Kingdom Plantae is characterized by the presence of chloroplasts. Chloroplasts are the site of photosynthesis in plant cells, where light energy is converted into chemical energy. This is not to say that all organisms with chloroplasts belong to the Plantae kingdom, but it is a common feature of this kingdom.