Practice MCQ Questions and answers on Biology-GK

The medulla oblongata helps regulate breathing, heart and blood vessel function, digestion, sneezing and swallowing. This part of the brain is a center for respiration and circulation. Sensory and motor neurons (nerve cells) from the forebrain and midbrain travel through the medulla.

Compared to land, the open oceans are nutrient-poor environments.

Study of effect of radiation on plant and animal is Radiobiology.

The Nobel Prize in Chemistry 1961 was awarded to Melvin Calvin "for his research on the carbon dioxide assimilation in plants."

The Kyoto Protocol is an international agreement that aimed to manage and reduce carbon dioxide emissions and greenhouse gases. The Protocol was adopted at a conference in Kyoto, Japan, in 1997 and became international law on February 16, 2005.

Fixation converts nitrogen in the atmosphere into ammonium that plants can absorb through their root systems. A small amount of nitrogen can be fixed when lightning provides the energy needed for N₂ to react with oxygen, producing nitrogen oxide, NO, and nitrogen dioxide, NO₂.

In plants, Chlorenchymatous carry out photosynthesis.

In plants, the process of photosynthesis takes place in the mesophyll of the leaves, inside the chloroplasts. Chloroplasts contain disc-shaped structures called thylakoids, which contain the pigment chlorophyll.

The energy stored in photosynthesis is obtained from sunlight.

The maximum 20% of the input of solar energy falling on leaves is converted into chemical energy by green plants. Green plants utilize solar energy and synthesize sugar from CO₂ and water through the process of photosynthesis. However, they are able to utilize only 3% of the light energy that strikes on their green parts; the rest is dissipated as heat.