Download App

Our Environment — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceOur Environment1 Mark
MCQ
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : If pesticide is present in water bodies, then fish eating birds accumulate maximum amount of $\ce{DDT}$ in their bodies.
Reason : Pesticides are not metabolized within bodies of living organisms and get concentrated at each trophic level, leading to bioaccumulation.
  • ✓
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.
✓

Answer

Correct option: A.
Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion - Reasoning (1 Marks)" from Our Environment→Our Environment — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as :
Assertion : Speciation is the development of one or more species from an existing species.
Reason : Classification is the arrangement of boat organisms into a series of groups based on physiological, biochemical or other relationships.
→

Assertion (A): Corrosion of iron is commonly known as rusting
Reason (R): Corrosion of iron occurs in presence of water and air. 

→
For two statements are given-one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)} $ and $(d)$ as given below :
Assertion : ln a balanced chemical equation, total mass of the reactants is equal to the total mass of the products.
Reason : Mass can neither be created nor destroyed during a chemical change.
→
In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as :
Assertion : $\text{ENT}$ specialist use a concave mirror as a head mirror to concentrate light on the body parts like eye, ear, nose etc.
Reason : A concave mirror is more effective and easily available.
→
For question two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : Calcium sulphate hemihydrate, $\text{CaSO}_4.\frac{1}{2}\text{H}_2\text{O}$ is called plaster of Paris.
Reason : Plaster of Paris is used for producing moulds for pottery and ceramics and casts of statues.
→
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below:
Assertion : If mother is homozygous for black hair and father has red hair then their child can inherit black hair.
Reason : Gene for black hair is recessive to gene for red hair in humans.
→
For two statements are given-one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : The size of the mirror affect the nature of the image.
Reason : Small mirrors always form virtual images.
→
Assertion (A): Sodium metal is stored under Kerosene.
Reason (R): Metallic sodium melts when exposed to air
→
Assertion (A): The colour of aqueous solution of copper sulphate turns colourless when a piece of lead is added to it.
Reason (R): Lead is more reactive than copper, and hence displaces copper from its salt solution
→
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : Condom protects a person from the sexually transmitted diseases.
Reason : Condom prevents the sperms from meeting the ovum by acting as a barrier.
→