The Paris Climate Conference, officially known as COP21, was held in 2015 in Paris, France. It brought together representatives from nearly every country to address the growing threat of climate change. The conference resulted in the historic Paris Agreement, a global pact aimed at limiting the rise in average global temperatures to well below 2°C above pre-industrial levels, with efforts to restrict it to 1.5°C. This agreement is significant because it marked the first time that both developed and developing nations committed to reducing greenhouse gas emissions. Countries pledged to set nationally determined contributions (NDCs), which outline their climate action plans. The agreement also includes mechanisms for monitoring progress and providing financial support to developing nations. The other options are incorrect because the Paris Agreement was specifically finalized in 2015. The year 2016 is associated with the agreement entering into force, not its negotiation. Understanding the timeline of global environmental agreements is important in competitive exams and helps in building awareness of international cooperation. Therefore, 2015 is the correct answer as it represents a milestone in climate diplomacy and global environmental governance.

A simple data structure refers to a basic and linear way of organizing data in memory. Among the given options, an array is considered the simplest data structure. It stores elements of the same type in contiguous memory locations, allowing direct access using an index. This makes arrays efficient for accessing and storing data when the size is known in advance. Arrays are widely used in programming because of their simplicity and speed. They allow constant time access (O(1)) to elements, which is a major advantage over more complex structures. However, arrays have limitations such as fixed size and difficulty in insertion or deletion operations. Graphs, trees, and networks are non-linear and more complex data structures. They are used for advanced applications like hierarchical data representation and relationships. Thus, array is the correct answer because it represents the most basic and fundamental data structure in computer science.

The Taj Mahal was constructed by Mughal Emperor Shah Jahan in memory of his wife Mumtaz Mahal. Built in Agra, India, it is one of the most famous monuments in the world and a UNESCO World Heritage Site. Construction began in 1632 and took over 20 years to complete. The monument is known for its white marble architecture and intricate design. Thus, Shah Jahan is the correct answer.

In flowering plants, after fertilization occurs, the ovary of the flower develops into the fruit. The ovary contains ovules, which, after fertilization, develop into seeds. The fruit serves to protect the seeds and aid in their dispersal. Different types of fruits develop depending on the plant species and structure of the ovary. The stigma is the receptive part of the pistil for pollen, anthers produce pollen, and petals attract pollinators. None of these develop into fruit. Thus, the ovary is the correct answer. This concept is important in plant reproduction and agriculture. Understanding fruit development helps explain how plants reproduce and spread in different environments.

Mastication refers to the process of chewing food in the mouth. It is the first step of digestion, where food is broken down into smaller pieces by the teeth and mixed with saliva. Saliva contains enzymes such as amylase, which begin the chemical digestion of carbohydrates. Chewing also increases the surface area of food, making it easier for digestive enzymes to act. Assimilation refers to the use of absorbed nutrients by the body, absorption is the uptake of nutrients into the bloodstream, and excretion is the removal of waste. Thus, chewing of food is the correct answer. Mastication is essential for proper digestion and nutrient absorption. Understanding digestive processes is important in biology and health sciences.