Home
Class 11
BIOLOGY
Asseration : Sporozoans may have silica ...

Asseration : Sporozoans may have silica shells on their surface.
Reason : Shells of sporozoans help in protection from acidic environment of the host.

A

If both assertion and reason and true and reason is the correct explanation of assertion.

B

If both assertion and reason and true and reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Analyze the Assertion The assertion states that "Sporozoans may have silica shells on their surface." - Sporozoans are a group of protozoan parasites, and they are known to have a protective covering. However, this covering is typically an elastic pellicle or cuticle, not silica shells. Therefore, the assertion is incorrect. ### Step 2: Analyze the Reason The reason states that "Shells of sporozoans help in protection from the acidic environment of the host." - Sporozoans do not primarily reside in an acidic environment. Their protective covering (pellicle or cuticle) serves different functions, such as providing structural support and facilitating respiration, rather than specifically protecting against acidity. Hence, the reason is also incorrect. ### Step 3: Conclusion Since both the assertion and the reason are incorrect, we conclude that the correct answer is: - **Option D: Both assertion and reason are false.**
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Analyze the Assertion The assertion states that "Sporozoans may have silica shells on their surface." - Sporozoans are a group of protozoan parasites, and they are known to have a protective covering. However, this covering is typically an elastic pellicle or cuticle, not silica shells. Therefore, the assertion is incorrect. ### Step 2: Analyze the Reason The reason states that "Shells of sporozoans help in protection from the acidic environment of the host." ...
Promotional Banner

Topper's Solved these Questions

  • BIOLOGICAL CLASSIFICATION

    NCERT FINGERTIPS ENGLISH|Exercise Biological Classification|132 Videos

  • BIOLOGICAL CLASSIFICATION

    NCERT FINGERTIPS ENGLISH|Exercise Exemplar Problems|12 Videos

  • ANIMAL KINGDOM

    NCERT FINGERTIPS ENGLISH|Exercise Animal Kingdom|148 Videos

  • BIOMOLECULES

    NCERT FINGERTIPS ENGLISH|Exercise Biomolecules|137 Videos

Similar Questions

Explore conceptually related problems

Assertion : He and Be have similar valence shell electronic cofiguration ns^(2) Reason :Both are chemically inert.

Read the assertion and reason carefully to mark the correct option in question. Assertion: In the cell membrane , the non-polar tail of saturated hydrocarbons is protected from the aqueous environment. Reason: The lipids are arranged within the membrane with polar head towards the outer sides and the hydrophobic tail towards the inner part.

Assertion : Ionisation enthalpy of noble gases is zero Reason :Noble gases have fully field valance shell

A positive point charge q is placed at a distance 2 R from the surface of a metallic shell of radius R. the electric field at centre of shell due to indouced charge has magnitude

Assertion : Noble gases have highest ionisation enthalpies in their respective periods. Reason : Noble gases have stable closed shell electronic configuration.

Assertion : Noble gases are chemically inert Reason :All noble gases have ns^(2)np^(6) valence shell electronic configuration

Assertion :- Acid which reach intestine does not damage it. Reason :- The mucous along with the bicarbonates from the pancreas protects the intestinal mucosa.

If gravitational field Intensity is E at distance R/2 outside from then surface of a thin shell of radius R , the gravitational field intensity at distance R/2 from its centre is

Assertion: Mucosal epithelium of gut has goblet cells which secrete mucus. Reason: The mucus in the gastric and pancreatic juice protects the mucosa from excoriation by acidic secretion.

Sulphur and rest of the elements of group 16 are less electronegative than oxygen, Therefore, their atoms cannot take electrons easily. They can acquire ns^2 np^6 configuration by sharing two electrons with the atoms of other elements and thus, exhibit +2 oxidation state in their compounds. In addition to this, their atoms have vacant d-orbitals in their valence shell to which electrons can be promoted from the p and s-orbitals of the same shell. As a result, they can show +4 and + 6 oxidation states. Oxygen exhibits +2 oxidation state in