CBSE Questions for Class 9 Biology Diversity In Living Organisms Quiz 9 - MCQExams.com

• Dorsal fins are single and located at the back of the body of fish.
• Ventral fins are also called pelvic fins and are paired. These are generally located behind the pectoral fins.
• Caudal fins are the tail fins and maybe homocercal or heterocercal.

Correct Option: A

Explanation

• Malpighian tubules are excretory structures.

• These are the structures of most insects.

• insects like cockroaches have Malpighian tubules.

• Malpighian tubules help in the removal of nitrogenous material, inorganic salts, and water in blood or haemolymphs. 

• Annelids have nephridia as their excretory organs.

Hence, Malpighian is the excretory organ of insects.

• The garden lizard is an insectivore. 
• It is distributed throughout the world. 
• During the breeding season, the head, throat, and shoulder of the male turn bright red just because of this character it is called bloodsucker.
• Hence the option 'C' is correct.

• Flying Lizard doesn't have wings they fly using their limbs so the 1st option is incorrect.
• Webbed digits are present in aquatic animals which help them for swimming so option C is wrong.
• The flat tail is present semi-aquatic animals which help them in swimming

• The sea snakes are also called as coral reef snakes. 
• They are a family of venomous elapid snakes that inhabit marine environments.
• Each sea snake is poisonous and they carry a highly venomous poison gland in their mouth.
• Hence, the option 'C' is correct. 

• Glass snake is the name of legless lizard.
• It belongs to Ophisaurus is a genus.
• Although most species have no legs, their head shapes, movable eyelids, and external ear openings identify them as lizards.
• So, option B is correct here.

• Snakes and other reptiles are cold-blooded animals. They lack the ability to generate body heat internally. Their body temperature varies with that of the environment.
• Cold-blooded animals are also called poikilotherms.
•  Warm-blooded animals include birds and mammals. These animals regulate their body temperature through mechanisms known as endothermy and homeothermy and hence, are also called endotherms and homeotherms.
• Endothermy refers to the process by which various animals control their body temperature through internal means like burning fat, shivering, and panting.
• Homeothermy is the mechanism utilized by various animals to maintain a constant internal temperature instead of varying external temperatures.
• Most warm-blooded animals use a combination of these two mechanisms to maintain constant body temperature.

So, the correct answer is option D.

• Cobra belongs to the family Elapidae
• all members of elapidae produce neurotoxic venom.
• This venom directly affects the nervous system of prey.
• so, option B is correct.

• Aves and mammals are warm-blooded animals as they can regulate their body temperature. Hence, options A, B and C fall under the warm-blooded animal category. 
• While snakes are reptiles and all reptiles are cold-blooded animals. They raise their body temperatures by lying in the sun or lower it by crawling. 

A. Correct option- A
B. Explanation for the correct option.

Sphenodon is a New Zealand lizard. The anatomical characteristics of this organism differ widely from all other existing lizards. It is the only living representative of the order Rhynchocephalia, of which many Mesozoic fossil species are known.

• The true koels are also called as Eudynamus belonging to a genus of cuckoos from Asia, Australia and Pacific.
• They are large sexually dimorphic cuckoos which eat fruits and insects. They are brood parasites, laying their eggs in the nests of other species.
• When the founding fathers of Indian ornithology, the British, noticed that the koel sang also by night, they nostalgically referred to the bird as "the Indian Nightingale".
  
• Hence Indian Nightingale is Eudynamis.
• So, the correct answer is 'Eudynamis'.