Home
Class 11
BIOLOGY
Assertion:In molluscs, feather-like gill...

Assertion:In molluscs, feather-like gills are present in mantle cavity.
Reason: These gills have respiratory and excretory functions.

A

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

B

If both assertion and reason are true but 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

Verified by Experts

The correct Answer is:
b
In molluscs, the space between the mantle and the hump is called mantle cavity in which feather-like gills are present. They have both respiratory and excretory functions.
Doubtnut Promotions Banner Mobile Dark
|

Similar Questions

Explore conceptually related problems

Assertion : Plants have no specialised respiratory organs. Reason : There is very little transport of gases from one plant part to another.

Assertion : All expression vectors are cloning vectors and vise versa. Reason : Expression vectors have at least the regulatory sequences i.e., promotes, operators, ribosomal binding sites, etc having optimum function in the chosen control but not origin of replication.

Knowledge Check

  • The mantle cavity of the molluscs has got number of feather like gills, which are respiratory and excretory in function are:

    A
    Book lungs
    B
    Trachea
    C
    Ambulacral system
    D
    Ctenidia

  • Assertion: Carbondioxide is one of the important green house effect. Reason: It is largely produced by respiratory function of animals and plants.

    A
    Both (A) and (R) are correct and (R) is the correct explanation of (A)
    B
    Both (A) and (R) are correct and (R) is not the correct explanation of (A)
    C
    Both (A) and (R) are not the correct
    D
    (A) is correct but (R) is not correct

  • Assertion: Cerebrospinal fluid is present througout the central nervous system. Reason: Cerebrospinal fluid has no such functions.

    A
    Assertion is correct and reason is wrong
    B
    Reason is correct and the assertion is wrong
    C
    Both assertion and reason are correct
    D
    Both assertion and reason are wrong

    • Similar Questions

    Explore conceptually related problems

    Assertion: The shape of the uterus is like an inverted pear. Reason: The inner glandular layer that lines the uterine cavity is called as myometrium.

    Assertion:Association areas are neither clearly sensory nor motor in function. Reason:Association areas are responsible for complex functions like intersensory associations, memory and communication.

    Assertion : Opioids help to enhance respiratory activity. Reason : Opioids are the drugs which binds to specific opioid receptors present in respiratory tract.

    Assertion: Fibrous joints play a significant role in locomotion. Reason: Fibrous joints have fluid-filled cavity between the articulating surfaces of the two bones.

    Assertion (A): Alcohols have higher boiling points than ethers of comparable molecular mass. Reason (R): Alcohols and ethers are functional isomes.

    Home
    Profile