1. Islets of langerhans are related to which of the following?
[A] Calcitonin
[B] Insulin
[C] Thyroxine
[D] None of the above
Show Answer
Correct Answer: B [Insulin]
Notes:
The pancreatic islets or islets of Langerhans are the regions of the pancreas that contain its endocrine which is also called as hormone-producing cells. They are also known as the insulin-producing tissue.
2. How many vertebrae does a human being have ?
[A] 33
[B] 36
[C] 29
[D] 19
Show Answer
Correct Answer: A [33]
Notes:
The vertebral column usually consists of 33 vertebrae: 24 presacral vertebrae (7 cervical, 12 thoracic, and 5 lumbar) followed by the sacrum (5 fused sacral vertebrae) and the coccyx (4 frequently fused coccygeal vertebrae).
3. The human musculoskeletal system consists of
[A] human skeleton
[B] bones attached to other bones with joints
[C] skeletal muscle attached to the skeleton by tendons.
[D] All the above
Show Answer
Correct Answer: D [All the above]
Notes:
The human musculoskeletal system consists of human skeleton, bones attached to other bones with joints and skeletal muscle attached to the skeleton by tendons. It permits movement of the body, maintains posture and circulates blood throughout the body.
4. The metals in which among the following groups are required in maximum quantities in a living organism?
[A] Potassium, Manganese, Molybdenum, Calcium
[B] Potassium, Molybdenum, Copper, Calcium
[C] Pottassium,Sodium, Magnesium, Calcium
[D] Sodium, Magnesium, Copper, Manganese
Show Answer
Correct Answer: C [Pottassium,Sodium, Magnesium, Calcium]
Notes:
Potassium, Sodium, Magnesium, Calcium are required in maximum quantities in a living organism.
5. Penicillin’ which is used as an antibiotic is obtained from :
[A] Bacteria
[B] Fungi
[C] algae
[D] Lichens
Show Answer
Correct Answer: B [Fungi]
Notes:
Penicillin is derived from the mold Penicillium, specifically Penicillium chrysogenum. Discovered by Alexander Fleming in 1928, it was the first true antibiotic and revolutionized medicine by effectively treating bacterial infections. Its use importantly reduced mortality rates from bacterial diseases during and after World War II.
6. With reference to reproduction in plants, the "Double fertilisation" explains:
[A] how each single pollen grain is able to produce twin sperm cells
[B] how two pollen grains produce single sperm cells
[C] how two pollen grains produce two sperm cells
[D] how single pollen grain produces single sperm cell
Show Answer
Correct Answer: A [ how each single pollen grain is able to produce twin sperm cells]
Notes:
In Angiosperms plant reproduction, two structures are created: a zygote and the endosperm. A zygote will grow and develop into an embryo, or baby plant.The process of single pollen grain producing two sperm cells with one combining with egg to form a zygote and other to form endosperm is called double fertilization.
7. Which of the following branches of Biology is concerned with the effects of radiation on living organisms?
[A] Actinobiolgy
[B] Cryobiology
[C] Cytogenetics
[D] Aerobiology
Show Answer
Correct Answer: A [Actinobiolgy]
Notes:
Actinobiolgy is the branch of biology which studies the effects of radiation on organisms. Cryobiology involves study of life at Low temperatures; Cytogenetics involves Cytological basis of inheritance and Aerobiology deals with the studies of spores and micro organisms in air.
8. Which among the following is the correct sequence of the Levels of Organisation found in living organsims?
[A] Individual – Organ system – Tissue – Cell – Organ
[B] Organ – Organ system – Tissue – Cell – Individual
[C] Tissue – Cell – Organ – Organ system – Individual
[D] Cell – Tissue – Organ – Organ system – Individual.
Show Answer
Correct Answer: D [Cell – Tissue – Organ – Organ system – Individual.]
Notes:
The correct sequence of the level of Organisation in living organism is :Cell – Tissue – Organ – Organ system – Individual. The cell is basic unit of life and thesmallest level of organisation of the living organisms.In multicellular organisms more than one cell of similar or dissimilar nature combine to form a tissue.Different tissues combone to form distinct organs. A group of organs coordinating to performs a major function forms the organ system.A multicellular individual is formed by the combination of many organ systems working in coordination. Thus Option [D] is correct
9. What is epidermis made of?
[A] Dermatogen
[B] Periblem
[C] Protoderm
[D] Plerome
Show Answer
Correct Answer: A [Dermatogen]
Notes:
Dermatogen is the outer primary meristem of a plant or plant part that according to the histogen theory gives rise to epidermis, which is the outermost layer of the skin. Epidermis provides barrier to infection from environmental pathogens.
10. HIV often changes its shape due to the presence of which of the following enzymes?
[A] Reverse Transcriptase
[B] Enterokinase
[C] Nucleoditase
[D] None of the above
Show Answer
Correct Answer: A [Reverse Transcriptase]
Notes:
A reverse transcriptase is an enzyme used to generate complementary DNA from an RNA template, a process termed reverse transcription. The viral DNA is cut and paste into the host cell DNA. The host cell gets tricked into making lots of proteins for the virus.
