Assertion: In flatworms, fertilisation is internal and development is through many larval stages.
Reason: Some parasitic flatworms absorb nutrients from the host directly through their body surface.

Read the following statement carefully. (a). Hooks and sucker are present in parasitic forms b. Some of them absorb nutrients from the host directly through their body surface. (c). Fertilisation is internal and development is through many larval stages. Here we are talking about:

Assertion :- Hooks and suckers are present in the parasitic form of flat worms. Reason :- It helps in absorbing nutrients from the host body.

Assertion: Many adaptations have evolved ever a long evolutionary time and are genetically fixed. Reason: Some organisms coping with extremes in the environment able to respond through certain physiological and behavioural adjustments.

Assertion: The first step of gas exchange occurs through body surface in some animals. Reason: Body surface or membrane of amphibia is thick in nature.

Assertion: The first step of gas exchange occurs through body surface in some animals. Reason: Body surface or membrane of amphibia is thick in nature.

Assertion: The surface wave propagation is used for medium wave band and for television broadcasting. Reason: The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.

Assertion: The surface wave propagation is used for medium wave band and for television broadcasting. Reason: The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.