Which of the following statements is incorrect with regard to bilateral symmetry? (A) Body can be divided into two equal halves by a single plane only. (B) The organisms that show bilateral symmetry have paired body organs that occur on the two sides of a central axis. (C) It is found in all invertebrates and few vertebrates. (D) Spider and crab show bilateral symmetery.
Answer: C Bilateral symmetry is found in few invertebrates and all vertebrates.
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.
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