The law of variable proportions state that as the quantity of one factor is increased, keeping the other factors fixed, the marginal product of that factor will eventually decline. This means that up to the use of a certain amount of variable factor, marginal product of the factor may increase and after a certain stage it starts diminishing.
Assumptions of Law of Variable Proportions:
1. Constant State of Technology: First, the state of technology is assumed to be given and unchanged. If there is improvement in the technology, then the marginal product may rise instead of diminishing.
2. Fixed Amount of Other Factors: Secondly, there must be some inputs whose quantity is kept fixed. It is only in this way that we can alter the factor proportions and know its effects on output. The law does not apply if all factors are proportionately varied.
3. Possibility of Varying the Factor proportions: Thirdly, the law is based upon the possibility of varying the proportions in which the various factors can be combined to produce a product. The law does not apply if the factors must be used in fixed proportions to yield a product.

Molarity is no. if moles of solute per volume of solution (in litre)
therefore moles of NaCl is 5.85/58.5 = 0.1
volume of solution is 0.5 litre
molarity = 0.1/0.5 = 0.2

Acceleration is rate of change of velocity with time. It is denoted by ‘a’ and the SI unit is m/s².

Average acceleration is change of velocity over a time interval.

The order of the electron orbital energy levels, starting from least to greatest, is as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. 

5 s has lowest energy

An orbital is the region of space around the nucleus within which the probability of finding an electron of given energy is maximum. The probabilit The probability at an y at any point around the nucleus is calculated using schrodinger w y point around the nucleus is calculated using schrodinger wave equation and is represented by the density of the points.

Mrs Dorling is an important character of Marga Minco’s short story The Address’. She is introduced to us as the mother of a fifteen-year old daughter. Like her daughter, Mrs Dorling has a ‘broad back’. When the narrator rings the bell, Mrs Dorling appears wearing the green knitted cardigan of the narrator’s mother. This shows how mercilessly she is using all ‘nice things’ of Mrs S.

Mrs Dorling lacks human qualities of head and heart. She is selfish. She is rude and ill mannered. She also lacks good sense and decency. She only knows how to exploit people and situations to her own advantage. She exploits Mrs S’s fear for war. She walks away with all her ‘nice things’ to 46, Marconi Street. She makes no effort to return them when the narrator visits her.

1. You always travel by bus. (Make a ‘Wh' question)
2. Go to the barber and get ............... (Complete the sentence)

A n s w e r :

1. Why do you always travel by bus?

2. Go to the barber and get your hair cut.

1) Biodiversity- the variety of plants and animals life in a particular habitat, a high level of which is usually considered to be important and desirable.
2) Nomenclature- system of names/terms/ the rules for forming these terms in a particular field of arts or sciences.

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“We are not Afraid to Die.........” is a first person account of an adventurous ordeal that a family experiences during the voyage. There are three sections of the text. The narration of events matches the mood of the voyage. The first section describes how the voyage began with great hope and fanfare in July 1976. They were attempting to ‘duplicate the round-the-world voyage made 200 years earlier by Captain James Cook. Wavewalker had been professionally built. It was thoroughly tested in the roughest weather. They sailed down to Cape Town. The trouble started only when they left Cape Town. On January 2, the waves were gigantic. The narration of the events mirrors the hectic efforts of the captain and the crew to protect Wavewalker.

The second section : “Search for an Island” describes their struggle for survival for the last 15 hours. On January 4, they ate their first meal in almost two days. But the respite was short lived. This also captures the highly emotional response of the children. Jon declared : "We aren’t afraid of dying if we can all be together—you and Mummy, Sue and I.”

In the last section “Cheerful Landing” the narration shifts back to the relaxed style. The captain was sure to reach lle Amsterdam. Jon gave the good news. The island was in front of them. All the 28 inhabitants were there to cheer and help them ashore.

Key is a taxonomical aid that helps in identification of plant and animal species. These keys are based on similarities and dissimilarities in characters, generally in a pair called couplet.

Each statement in a taxonomic key is referred to as a lead. For categorizing each taxonomic rank, such as family, genus, species, etc., different keys are used. It is also useful in identification of unknown organisms.

Keys are of two types- indented and bracketed keys. Indented key provides a sequence of choices between two or more statements while in bracketed key, a pair of contrasting characters are used.