Which one of the following groups of animals is correctly matched with its characteristic feature without any exception ? (A) Reptilla : possess 3-chambered heart with an incompletely divided ventricle (B) Chordata : possess a mouth with an upper and a lower jaw (C) Chondrichthyes : possess cartilaginous endoskeleton, (D) Mammalia : give birth to young ones.
Answer: C Reptiles usually possess 3-chambered heart but crocodiles are an exception with 4-chambered heart. Not all chordates have a mouth with upper and lower jaw. Egg laying mammals include duck-billed platypus. Chondrichthyes (cartilaginous fishes) are the fishes that have cartilaginous endoskeleton. there is no exception to this.
Select the correct pair out of the following (A) Hypostomatic leaf-dicots (B) epistomatic leaf-monocots (C) amphistomatic leaf-free-floating hydrophytes (D) presence of sunken stomata in leaf-submerged hydrophytes
The type of muscle present in our (A) heart is involuntary and unstirated smooth (B) intestine is striated and involuntary (C) thigh is striated and voluntary (D) upper arm is smooth muscle and fusiform in