31. The open space between bones is filled by which of the following?
[A] air
[B] blood
[C] bone cells
[D] bone marrow
Show Answer
Correct Answer: D [bone marrow]
Notes:
Bone marrow is found in the hollow center of bones. Bone marrow cells – the soft, fatty core of many bones, this protected hollow space makes red blood cells and releases them into the bloodstream.
32. A small band of dense, white, and fibrous elastic tissue is grouped as __
[A] ligament
[B] muscle junction
[C] muscle filament
[D] muscle cartilage
Show Answer
Correct Answer: A [ligament]
Notes:
A ligament is a small band of dense, white, fibrous elastic tissue.
33. What is the function of the vena cava in the excretory system?
[A] form a network between the arteries to veins
[B] return deoxygenated blood from the body and the head to the heart
[C] Both 1 and 2
[D] None of these
Show Answer
Correct Answer: B [return deoxygenated blood from the body and the head to the heart]
Notes:
The vena cava returns deoxygenated blood from the body and head to the heart.
34. Which of the following secretes relaxin during pregnancy?
[A] Corpus luteum
[B] Antidiuretic hormone
[C] Prolactin
[D] Adrenaline
Show Answer
Correct Answer: A [Corpus luteum]
Notes:
The Corpus luteum secretes relaxin during pregnancy. The human corpus luteum secretes relaxin, oxytocin, and progesterone.
35. The type of placenta found in humans is called __.
[A] Discoidal
[B] Cotyledonary
[C] Zonary
[D] Diffuse
Show Answer
Correct Answer: A [Discoidal]
Notes:
Placenta found in humans is called discoidal. It is a placenta in which the chorionic villi are arranged in a circular plate.
36. What disease is caused by Corynebacterium?
[A] Whooping cough
[B] Tuberculosis
[C] Diphtheria
[D] Gonorrhoea
Show Answer
Correct Answer: C [Diphtheria]
Notes:
Diphtheria is a serious infection caused by strains of bacteria called Corynebacterium diphtheriae.
37. Bacteria protect themselves from viruses by fragmenting viral DNA?
[A] Ligase
[B] Endonuclease
[C] Exonuclease
[D] Gyrase
Show Answer
Correct Answer: C [Exonuclease]
Notes:
Bacteria protect themselves from viruses by fragmenting viral DNA with Exonuclease. Enzymes that work by cleaving one nucleotide at a time from the end (Exo) of the polynucleotide chain are called exonucleases.
38. In females, the uterus is ____:
[A] Single
[B] Double
[C] Triple
[D] Quadruple
Show Answer
Correct Answer: A [Single]
Notes:
Females have single uterus. Also known as womb, it is a major female hormone-responsive reproductive sex organ of humans and most other mammals. It is within the uterus that the fetus develops during gestation.
39. Blue-green algae are included in the group ____:
[A] Protozoa
[B] Eubacteria
[C] Fungi
[D] Cyanobacteria
Show Answer
Correct Answer: D [Cyanobacteria]
Notes:
Cyanobacteria, also known as blue green algae, are single-celled and belong to the family of Prokaryotes. That means, they do not have a well defined cell nucleus. The ability of cyanobacteria to perform oxygenic photosynthesis is thought to have converted the early reducing atmosphere into an oxidizing one, which dramatically changed the composition of life forms on Earth by stimulating biodiversity and leading to the near-extinction of oxygen-intolerant organisms.
40. Which part of the brain is responsible for triggering actions like thinking, intelligence, memory and ability to learn?
[A] Control
[B] Cerebrum
[C] Hypothalamus
[D] Diencephalon
Show Answer
Correct Answer: B [Cerebrum]
Notes:
The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action. Functions of the cerebrum include: initiation of movement, coordination of movement, temperature, touch, vision, hearing, judgment, reasoning, problem solving, emotions, and learning.
