31. In which order are lizards and snakes divided into reptiles?
[A] Order Testudines
[B] Order Crocodilia
[C] Order Squamata
[D] Order Sphenodontia
Show Answer
Correct Answer: C [Order Squamata]
Notes:
In order Squamata, lizards and snakes are divided. Whereas Turtles, Tortoises, Terrapins are divided into order Testudines, Crocodiles, Alligators are divided into order Crocodilia and Tuataras are divided into order Sphenodontia.
32. The material covering the bones of reptiles is?
[A] Calcium
[B] Chitin
[C] Keratin
[D] None
Show Answer
Correct Answer: C [Keratin]
Notes:
The material covering the bones of reptiles is Keratin and their skin is dry, and rough, without any glands.
33. This is not a classification of mammals:
[A] Eutheria
[B] Anapsida
[C] Metatheria
[D] Prototheria
Show Answer
Correct Answer: B [Anapsida]
Notes:
Anapsida is not a classification of mammals. Anapsida belongs to the subclass of reptiles whereas Eutheria, Metatheria, and Prototheria belong to class mammalia.
34. Which of the following is not the function of skin?
[A] calcium production
[B] protection
[C] excretion of wastes
[D] temperature regulation
Show Answer
Correct Answer: A [calcium production]
Notes:
The skin’s function is to protect us from microbes and the elements help regulate body temperature and permit the sensations of touch, heat, and cold.
35. What are the functions of connective tissue?
1. Insulating
2. Helps in binding the organs together and provides support
3. Helps in the constriction of organs and blood vessels
4. Provides shape to the body, conserves body heat, and also stores energy
Select the codes above:
[A] Only 1 and 2
[B] Only 2 and 3
[C] Only 1, 2 and 4
[D] 1, 2, 3 and 4
Show Answer
Correct Answer: C [Only 1, 2 and 4]
Notes:
The important and major functions of connective tissue in the body are: to insulate, Helps to connect and support the organs, protects against the invasion of pathogens by their phagocytic activity, Provides shape to the body, conserves body heat, and also stores energy, It is involved in the transport of water, nutrients, minerals, hormones, gases, wastes, and other substances within the body.
36. What is the role of dendrites in neurons?
[A] send messages from all the senses to the brain
[B] receive many signals from other neurons
[C] carry messages from the brain to all the muscles
[D] carry both sensory and motor nerves
Show Answer
Correct Answer: B [receive many signals from other neurons ]
Notes:
Nerve cells or neuron have extensive processes and are called dendrites. These occupy a large surface area of a neuron. They receive many signals from other neurons and contain special proteins that receive, process and transfer these to the cell body.
37. What is a joint?
[A] A hinge
[B] A ball and socket
[C] The place where two bones are joined
[D] The place where tendons are fastened together
Show Answer
Correct Answer: C [The place where two bones are joined]
Notes:
The place where bones meet is called a joint.
There are two basic types of joints:
1. Movable joints, such as the elbow, knee, and shoulder joints, allow varying degrees of motion.
2. Fixed joints do not allow any movement of bones. The bones of the skull, except the jawbones, join in stable joints.
38. Lassa and Ebola are emergent viruses in W. Africa. What is their origin?
[A] Humans
[B] Primates
[C] Fruit bats
[D] Pigs
Show Answer
Correct Answer: C [Fruit bats]
Notes:
Lassa and Ebola are emergent viruses in W. Africa originated by Fruit bats. Ebola hemorrhagic fever is caused by Ebola virus infection.
39. Which enzyme digests proteins in the stomach?
[A] Salivary amylase
[B] Trypsin
[C] Pepsin
[D] Pancreatic canal
Show Answer
Correct Answer: C [Pepsin]
Notes:
Protein digestion begins in the stomach with the action of pepsin. Pepsin is the active protein-digesting enzyme of the stomach. When pepsin acts on the protein molecule, it breaks the bonds that hold the protein molecule together, called peptide bonds. Once broken, peptide bonds yield chains of amino acids linked together called polypeptides that are further digested in the small intestine with the help of trypsin, chymotrypsin, and carboxypeptidase.
40. Commonest mammal is ____:
[A] Elephant
[B] Lion
[C] Human
[D] Panther
Show Answer
Correct Answer: C [Human]
Notes:
Humans are likely the most numerous species of mammal on Earth at the moment.
