Give one example of each:
$(a)$ Reptile which has a four-chambered heart.
$(b)$ Egg-laying mammal.
$(c)$ Parasitic Platyhelminthes.
$(d)$ Division among plants which has the simplest organisms.

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(N/A) Crocodile: Most reptiles have a three-chambered heart,but the crocodile is an exception with a four-chambered heart.
$(b)$ Platypus: Also known as the duck-billed platypus,it is a monotreme that lays eggs instead of giving birth to live young.
$(c)$ Tapeworm: These are flatworms that live as parasites in the intestines of other animals.
$(d)$ Thallophyta: This division includes plants like algae that have a simple,undifferentiated body structure (thallus).

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The endoskeleton of fishes is made up of cartilage or bone. Classify the following fishes as cartilaginous or bony: Torpedo,Sting ray,Dog fish,Rohu,Angler fish,Exocoetus.

State reasons for the following:
$(i)$ Tapeworms do not have a digestive tract.
$(ii)$ Frogs have both skin and lungs for breathing.
$(iii)$ $A$ whale is a mammal,not a fish.

Characteristics of some organisms are given. Identify their group and give one example of each.
$(a)$ Single-celled,eukaryotic,and photosynthetic.
$(b)$ The body is divided into segments,may be unisexual or hermaphrodite.

Justify giving one reason: crocodiles have a four-chambered heart,but are still classified as reptiles.

$(i)$ Draw a neat diagram of Hydra.
$(ii)$ Label mesoglea and gastrovascular cavity.
$(iii)$ Name the group of animals it belongs to.
$(iv)$ Name one species of this group that lives in colonies.

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