Explanation

The biosphere is the global ecological system integrating all living organisms (biotic) and their interactions with the non-living (abiotic) components (e.g., air, water, soil).

It spans from the deepest oceans to the atmosphere, encompassing all ecosystems where life exists.

Explanation

Rudolph Virchow proposed in 1855 that all new cells arise from pre-existing cells (“Omnis cellula e cellula”).

This idea supported the cell theory, challenging the earlier belief in spontaneous generation.

Explanation

A blood sugar level of 250 mg/dL is considered hyperglycemia (high blood sugar), especially 

Normal blood sugar is 70–99 mg/dL

fasting, low is below 70 mg/dL,

high is above 126 mg/dL fasting or 200 mg/dL after meals.

Explanation

Rainfall is a crucial factor in greening deserts, as it provides the necessary water for plant growth.

Explanation

Leucocytes are also known as white blood cells.

They are colorless, irregularly shaped, nucleated cells that are larger in size compared to red blood cells (RBCs).

They play a vital role in the immune system, helping to fight infections and diseases.

Explanation

The G1 phase (Gap 1 phase) is the period of extensive metabolic activity in the cell cycle where the cell grows, enzymes are synthesized, and DNA is replicated.

This phase is also known as the interphase or the growth phase.

Explanation

Deductive reasoning is a type of logical reasoning that uses "if-then" statements to arrive at a conclusion.

It involves making a logical deduction based on a premise.

It is used in scientific reasoning to test hypotheses and predict outcomes.

Explanation

The scientific method is a systematic approach used to develop and test scientific knowledge, including in biology and other sciences. It involves:

• Observations
• Hypothesis formation
• Prediction
• Experimentation
• Data analysis
• Conclusion drawing

Explanation

• Selective reabsorption primarily occurs in the proximal convoluted tubule (PCT).
• To a lesser extent, in the distal convoluted tubule (DCT), where essential nutrients, water, and ions are reabsorbed back into the bloodstream.

Explanation

Thermoregulation is the ability of an organism to maintain its body temperature within a suitable limit, despite changes in the external environment.

This is a crucial function that allows cells, tissues, and organs to function properly.