She is not right. There is always an element of risk involved in business.

The reactant that is entirely used up in a reaction is called as limiting reagent. This reactant generally determines when the reaction will stop. The exact amount of reactant which will be needed to react with another element can be calculated from the reaction stoichiometry.

Advance is used for the incomes when these received early. 

Prepaid is used for expenses when they are paid before they arise.

Air bladder in Pisces regulates buoyancy and helps in floating in the water. It prevents them from sinking,
(ii) Air bladder is present in members of the class Osteichthyes.
(iii) Animals of the class Chondrichthyes do not have air bladder and in the absence of air bladder, the animals have to,swim constantly to avoid sinking.

1. Sources of Income: Investors invest their money in the business with the sole purpose of earning profit, since profit is a source of income, it is therefore provides the owners of business the mean with which they and their family members can live a comfortable life.
2. Continuity of Business: The incentive of earning profit keeps the man engaged in business activities. A business can only grow and gain strength if it earns profit. So earning of profit is necessary for the continuity of business.
3. Expansion of Business : One of the roles of profit in business is that businessman retains and reinvests a part of its profits in business undertaking stands on sound footing. It can expand and diversify business not only from reinvestment of funds but also getting loans from external sources for business.
4. Reward of Risk Bearing: Profit is the reward for bringing new products or processes to the market. It is a reward for a risk successfully undertaken. Profit, therefore, is a reward for the future which is uncertain.
5. Profit and Economic Development: Another role of profit in business is economic development. Profit and economic development are closely related with each other. If the firms are not earning profit then there is no economic progress in the country. If there is no economic development there is no profit to the business.
6. Profit Acts as Measure of Efficiency: Profit acts as an index of performance for business, if the business firms are earning profits. It shows that the country is progressing satisfactorily

Bulk Modulus

• Bulk modulus is the ratio of hydraulic stress to the corresponding hydraulic strain.
• Denoted by ‘B’
• B = -p/(ΔV/V) 
• Where p =hydraulic stress, ΔV/V = hydraulic strain

(-) ive signs show that the increase in pressure results in decrease in volume.

• S.I. Unit :- N/m²  or Pascal(Pa)
• B(solids) > B(liquids) >B(gases)

(1) High Cost of Training: Besides the high cost of computer system, huge money is required to get the trained specialised staff to ensure efficient and effective use of computerised systems.

(2) Danger of System Failure: The danger of system crashing due to hardware failure and the subsequent loss of word is a serious limitation of this system.

(3) Staff Opposition: Whenever the Accounting System is computerised, there is a significant degree of resistance from the existing staff because of the fear that they shall be less important to the organisation.
(4) Disruption: The accounting process suffer a significant loss of work and time when an organisation switches over to this system. This is due to the changes in the working environment that requires accounting staff to adapt to new system and procedures.

The chloroplast has an inner and outer membrane with an empty intermediate space in between. Inside the chloroplast are stacks of thylakoids, called grana, as well as stroma, the dense fluid inside of the chloroplast. These thylakoids contain the chlorophyll that is necessary for the plant to go through photosynthesis. Two membranes contain and protect the inner parts of the chloroplast. They are appropriately named the outer and inner membranes. The inner membrane surrounds the stroma and the grana (stacks of thylakoids). One thylakoid stack is called a granum.