Error Identification

There is no condition in the sentence but a choice between two options is there. So, instead of 'if' we will use 'whether'.

One is 'slow at activities'. The preposition 'at' follows the adjective 'slow'. If we change 'calculations' to 'calculating' we require an object, e.g. calculating numbers.

We use 'neither' with two things. Moreover 'neither' is followed by a singular verb (belongs). Replacing 'any' with 'neither' corrects the sentence.

 Error of parallelism. Correct phrase is 'not having any meals at all'.

Correct phrase should be 'to shoot with'. You shoot with a gun, you do not shoot a gun. If we donot use 'with' the meaning that is derives is that the gun needs to be shot.

Use of the word 'with' is redundant. The phrase should be '....accidentally came across an old friend'.

The correct phrase should be 'to live in'. Some infinitive forms(live) take prepositions after them(in). E.g. She needs help to get up.

The correct phrase is 'defeated the French...'. "The" is used before French as we are referring to the army of France.

With although 'but' is not used. So correct phrase is 'Although you have made good to him, he still speaks ill of you.'

Correct phrase should be 'called on him' meaning 'to visit'.

Correct phrase should be 'the book' as sentence is referring to a particular book which is required for studying.

affection is always 'for'. So correct phrase should be 'even for'.

Correct use is .... an N. C. C. The pronunciation of 'N' in N.C.C starts with a vowel sound. Hence, 'an' will be used before N.C.C.

Each other refers to two, one another to more than two. As the first word of the sentence is 'all' ... we will use 'one another' instead of 'each other'.

Although there is lot of confusion regarding the capitalisation of 'Earth' as well as use of definite article 'the' before the name, we have to bear certain things in mind when we are dealing with grammatical usages. Earth is the name for one of the planets of the solar system. We use capital case when we name the other planets. So, unless we are talking of 'earth' as soil or the world, it is better to use it as a proper noun, in capital case, without article. 'Sun' is the central star of a planetary system. It is not used as a proper noun.

Correct word is 'into'....'into radioactive argon'. 'To' is indicative of incomplete action. But 'into' is more definite as it shows motion and change of form.

 Let us not confuse it with American English. For our purpose, 'practice' is a noun, 'practise' is a verb. We need a verb here.
In part (a), bacteria is a plural noun; singular is bacterium, so 'are' should be used. Therefore, it is correct.

Beside means next to.
Besides means apart from or and another thing.
In the sentence we are talking about the physiological changes in young children apart from children of ages nine and fifteen. So correct word should be 'Besides'.

Correct sentence is 'when scientists say...'. While is used whenever we refer to simultaneous activity. Here, no other activity is referred to. In the sentence when scientists are saying about a few degrees increase, they are actually talking about a greater amount. So, 'when' will be used.

There is no condition of time, so 'till' will not be used. Secondly, negative implication is being stated in the sentence. Hence, 'until' will be used.

The use of "in that" is the correct form for the sentence.

When we are comparing comparatives, 'the' precedes the comparisons. Thus, the correct phrase is 'the greater is the amount of....'.

Correct phrase is 'swarm of particles'. Swarm is a collective noun and hence, it will be followed by a plural noun.

'Although' and 'but' do not occur together. Correct phrase is '...when contaminated with other material..'

We are  talking about the pungent oil which is the source of strong taste of the vegetable. So, option 1 is correct.

"which is" the correct phrase here as we use relative pronoun 'which' for things or items. As it states a general fact present tense will be used. Option # is incorrect as it makes the first part of the sentence an independent clause, whereas it needs to be a dependent clause to make the sentence meaningful.

Correct phrase is...'in problem solving is jumping to a conclusion'.

Whenever we begin a sentence with a negative word, the helping verb always comes before the subject. "Not only does speech enable man...''

Correct word is with. You can be surrounded by people, but are surrounded with inanimate objects.

The correct word is 'besides,' which means 'in addition to' or 'other than.' The sentence means the camera can accept other lenses in addition to the normal one. 'Beside' means 'next to,' 'except' means exclusion, and 'including/excluding' don't fit the context.