The least possible diagram for the given statements is as follows

Conclusions:

I. Some humans are animals → False (It is possible but not definite)

II. No reptiles are ants → False (It is possible but not definite)

III. Some animals are ants → True (Some ants are birds and all birds are animals)

IV. Some ants are reptiles → False (It is possible but not definite) Conclusions II and IV forms complementary pairs

Hence, either conclusions II or IV and III follows.

Additional information:

Conditions for the Either Or:

1. Both the conclusion must be Cannot be determined.

2. Both the objects in both the conclusion must be same.

3. If one conclusion is positive, then other should be negative.

Complementary pairs:

1. All - Some not (Positions of the object should be same in the conclusion)

2. Some - No

The pattern follows:

The relationship here is between an animal and the sound it makes.

Goat makes a sound that is described as a "bleat".

So,

Dog makes a sound that is described as a "bark".

Hence, Bark is the correct answer.

Family Chart:

Let us first decode the given symbols and then draw a family tree.

Given: ‘C @ F × K + D'

So, C is the husband of F. F is the mother of K. K is the father of D.

Hence, C is the 'Father' of K.

Decoding the information,

Given:

30 + [{(12 - 13) × (5 ÷ 2)} + (18 × 13)] 

After replacing the signs from left to right and using the BODMAS rule,

30 ÷ [{(12 + 13) - (5 × 2)} ÷ (18 - 13)] 

= 30 ÷ {(25 - 10) ÷ 5}

= 30 ÷ (15 ÷ 5)

= 30 ÷ 3

= 10

Hence, “10” is the correct answer.

The logic followed here is:

'GRATEFUL' is coded as '209267562112',

The logic followed here is:

Logic: 1st number × (1st number - 3rd number) = 2nd number.

Now,

For (14, 112, 6)

→ 14 × (14 - 6)

→ 14 × 8 = 112.

For (17, 204, 5)

→ 17 × (17 - 5)

→ 17 × 12 = 204.

Similarly, for (21, 189, 12)

→ 21 × (21 - 12)

→ 21 × 9 = 189.

Hence, the correct answer is "Option 1".

The logic followed here is:

Option 1) VWYB

Here, 'QSVY' is odd among the given options.

Hence, the correct answer is "Option 3".

Family Chart:

Given: Pointing to a picture of a boy, Shreya said, "He is the only son of the man who is the father of my father's only son's son".

So, the boy is 'Nephew' of Shreya

Hence, the correct answer is "Option 2".

The logic followed here is:

Given Sequence: _tk _ tt _ ltt _ lt _ kl _ tk _

Now, putting the letters in the blank spaces given in the option one by one:

Option 1) tlkkttl → t t k l / t t k l / t t k l / t t k l / t t k l

Here, 'Option 1' followed a pattern.

Option 2) tllkttl→ t t k l / t t l l / t t k l / t t k l / t t k l

Option 3) tlktttl→ t t k l / t t k l / t t t l / t t k l / t t k l

Option 4) tlkktll→ t t k l / t t k l / t t k l / t t k l / l t k l

Hence, the correct answer is "Option 1".

The logic followed here is:

Logic: Second Letter = First Letter + 2

Third Letter = Second Letter - 1

Let's check each option as per the logic:

1) VXW:

4) BDC:

Here, we can see that only Option 2 doesn't follow the logic.

Hence, the correct answer is "EFG".