NEET Practice Questions (MCQs) with Answers & Solutions

Marine fish are adapted to live in saltwater environments, where they regulate their internal salt concentration to match the surrounding water. If a marine fish is placed in fresh water, it cannot adapt to the sudden change in salinity and will suffer from osmotic shock, leading to its death. Therefore, the correct answer is 'No, Because it can not adapt.'

Interspecific competition occurs between different species that compete for the same resources, such as food, light, or space. This competition typically results in more or less harmful effects to both organisms involved, as they expend energy and resources in the struggle to obtain what they need. The correct answer is 'more or less harmful effect to both.'

Antibiosis is a biological interaction where one organism produces substances that are harmful or lethal to another organism. Penicillium fungi produce penicillin, which is an antibiotic that inhibits the growth of certain gram-positive bacteria. Thus, the correct answer is 'Penicillium fungi and certain gram+ve bacteria.'

Marine habitats have a high concentration of salts compared to the body fluids of marine organisms. This creates a hypertonic environment, where the concentration of solutes in the habitat fluid is higher than in the body fluid of the organisms. Therefore, marine organisms often have to regulate their internal osmotic balance to survive.

The water holding capacity of soil is influenced by multiple factors including soil composition, grain size, and the aggregation of the grains. Soil composition determines the types of particles present, grain size affects the porosity and permeability, and aggregation refers to how these particles clump together, all of which collectively impact how much water the soil can hold.

Both statements X and Y are true. During evolution, species have indeed developed their internal environments to make physiological processes more efficient (Statement X). Additionally, organisms show various adaptations to survive and thrive in their specific environments (Statement Y). These adaptations can be structural, physiological, or behavioral.

Kangaroo rats live in arid environments and have adapted to such conditions by using the CAM (Crassulacean Acid Metabolism) pathway. This pathway allows them to minimize water loss by fixing CO2 at night.