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Standard XII

Biology

Desert

Statements: S...

Question

Statements: Some hills are rivers. Some rivers are deserts. All deserts are roads.
Conclusions:
I. Some roads are rivers.
II. Some roads are hills.
III. Some deserts are hills.

None follows

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Only I follows

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Only I and II follow

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Only II and III follow

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All follow

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Solution

The correct option is B Only I follows
Some hills are rivers. Some rivers are deserts.
Since both the premises are particular, no definite conclusion follows.
Some rivers are deserts. All deserts are roads.
Since one premise is particular, the conclusion must be particular and shouldn't contain the middle term. So, it follows that 'Some rivers are roads'. I is the converse of this conclusion and so it holds.
Some hills are rivers. Some rivers are roads.
Again, since both the premises are particular, no definite conclusion follows.

Suggest Corrections

Similar questions

Choose the correct option about conclusion drawn from the statements given below:

Statements:

Some hills are rivers.

Some rivers are deserts.

All deserts are roads.

Conclusions:

I. Some roads are rivers.

II. Some roads are hills.

III. Some deserts are hills.

Statement

All hills are rivers

All rivers are rocks

Some rocks are sticks

Conclusions

I. Some sticks are rivers

II. Some sticks are hills

III. Some rocks are hills

Statement

Some hills are rocks

All rocks are mountains

All mountains are rivers

No river is canal

Conclusions

I. All hills are rivers

II. Some rocks are canals

III. Some rivers are canals

Statement

Some lanes are towers

Some towers are roads

Some roads are rivers

Some rivers are jungles

Conclusions

I. Some jungles are roads

II. Some roads are towers

III. Some jungles are lanes

IV. No jungle is a road

Q. In each of the questions below, four statements are given followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements
All tables are round.
Some hills are round.
Some rivers are hills.
All rivers are conical.

Conclusions
I. Some rivers are round.
II. Some hills are conical.
III. Some rivers are both hills and round.
IV. Some tables are conical.

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Statements: Some hills are rivers. Some rivers are deserts. All deserts are roads.Conclusions:I. Some roads are rivers.II. Some roads are hills.III. Some deserts are hills.

Statements: Some hills are rivers. Some rivers are deserts. All deserts are roads.
Conclusions:
I. Some roads are rivers.
II. Some roads are hills.
III. Some deserts are hills.