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
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.
What is true about genetic material of a prokaryotic cell ? (A) Lacks histones (B) Not enceloped by nuclear membrane (C) Composed of a single circular DNA molecule (D) All of these
Plastids differ from mitochondria on the basis of which of the following features ? (A) Presence of two layers of membrane (B) Presence of ribosome (C) Presence of thylakodis (D) Presence of DNA
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
Carrier ions like \({N}{a}^{{+}}\) faciltate the absorption of substance like (A) amino acids, and glucose (B) glucose and fatty acids (C) fatty acids and glycerol (D) fructose and some amino acids.
Persistet nucellus is called as______________and is found in __________. (A) perispern, black pepper (B) perisperm, groundnut (C) endosperm, black pepper (D) endosperm,groundnut
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