Download App

MODEL PAPER 8 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 81 Mark
Question
Assertion (A): Ecology is study of relationship between living organisms and their environment.
Reason (R): The biotic community and non-living environment of an area function together to form an ecosystem.
✓

Answer

(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.

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 MODEL PAPER 8→MODEL PAPER 8 — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

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 : Keeping a point object fixed, if a plane mirror is moved, the image will also move.
Reason : In case of a plane mirror, distance of object and its image is equal from any point on the mirror.
→
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 reaction of calcium with water is less violent in comparison to that of sodium.
Reason : The heat evolved is not sufficient for the hydrogen to catch fire.
→
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 rainbow is seen when the sun is behind the observer.
Reason : Rainbow is produced due to dispersion of white light by small rain drops hanging in the air after the rain.
→
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 : Tooth decay starts when the pH of the mouth is lower than $5.5.$
Reason : Enamel starts corroding below $5.5. \ce{pH}.$
→
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 : Saturated hydrocarbons are chemically less reactive.
Reason : All the valencies of carbon atom are satisfied by single covalent bonds.
→
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 $(a), (b), (c)$ and $(d)$ as given below:
Assertion: Phosphoric acid is a weak acid.
Reason: Phosphoric acid when dissolved in water dissociates partially and produces very little $H^+$ ions.
→
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 : Plastic, glass and metal wastes keep accumulating in our surrounding and their amount never reduces with time.
Reason : Plastic, glass and metal wastes are non $-$ biodegradable, and they cannot be decomposed by microorganisms.
→
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 : Ionic compounds have high melting and boiling points.
Reason : A large amount of energy is required to break the strong inter $-$ ionic attraction in ionic compounds.
→
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 $(a), (b), (c)$ and $(d)$ as given below:
Assertion: Higher the $H+$ ion concentration, lower is the $pH$ value.
Reason: The pH of a neutral solution $= 7$, that of a basic solution$< 7$ and that of an acidic solution$> 7.$
→
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 : Alkali metals do not form dipositive ions.
Reason : After loss of one electron, alkali metals achieve stable configuration of noble gas.
→