Answer: C) cellulose Explanation: Plant cell walls are mostly made up of the molecule cellulose. Cellulose is a polysaccharide, a complex sugar made of long chains of glucose.   The cell wall must be made of thick and strong material as it provides the structural shape of the plant and protection from insects and microorganisms.

Answer: B) production of ATP from the breakdown of glucose Explanation: The three steps within the aerobic respiration process are glycolysis, the citric acid cycle, and oxidative phosphorylation. Photosynthesis builds glucose, and what was built in photosynthesis is broken down during aerobic respiration.   Hence, production of ATP from the breakdown of glucose is the main result of aerobic respiration.

Logically the given letter equation implies that, 200 Dollars for Passing GO in Monopoly.

Answer: A) 65 Explanation: Here the given numbers are related in such a manner that, 52 = 255+12 + 1 = 37Similarly, 72 = 497+12 + 1 = 64 + 1 = 65   Hence, 25 : 37 :: 49 : 65.

Answer: D) geothermal energy Explanation: Based on conventionality in deriving energy, energy sources could be classified as   Conventional :: coal, oil, hydro, nuclear, etc... sources which can be used up or exhaustible. (and) Non - conventional :: solar, wind, tidal, geothermal, biogas, etc... sources which are not exhausted.   Among the given options, Geothermal energy is the alternative energy source among all the choices that are given in the question, that is exhaustible.

Answer: C) Russia & USA Explanation: United States and Russia have together almost 400 billion tones. Which represents nearly 50% of world's reserves of coal.

Answer: A) Autotrophs Explanation: Plants make their own food through the process of photosynthesis. Plants are self-sufficient. Green plants have the ability to prepare their own food and this is the reason why they are called autotrophs.                                          They make their own food through the process of photosynthesis using light energy to make sugars from carbon dioxide (C02) and water (H20). The chlorophyll which is present in the leaves is the main reason for the production of food in the plants and it is the reason for the greenery of the leaves too.

Answer: B) 0 Explanation: No work done as there is no external external pressure in free expansion.    Hence, Work done in a free expansion process is Zero.