11. Which one of the following sets is correctly matched?
[A] Diphtheria, Pneumonia and Leprosy : Hereditary
[B] AIDS, Syphilis and Gonorrhoea : Bacterial
[C] Colour blindness, Hemophilia and Sickle cell anaemia : Sex linked
[D] Polio, Japanese B encephalitis and plague : Viral
Show Answer
Correct Answer: C [Colour blindness, Hemophilia and Sickle cell anaemia : Sex linked]
Notes:
• If you are colorblind, you have difficulty distinguishing certain colors, such as blue and yellow or red and green. Color blindness is an inherited condition that affects males more frequently than females
• Hemophilia A and hemophilia B are inherited in an X-linked recessive pattern. The genes associated with these conditions are located on the X chromosome, which is one of the two sex chromosomes. In females (who have two X chromosomes), a mutation would have to occur in both copies of the gene to cause the disorder.
• Sickle cell anemia is inherited as an autosomal recessive condition. This means that the gene can be passed on from a parent carrying it to male and female children.
12. Which of the following defines an Antigen?
[A] destroys harmful bacteria
[B] is used to treat poisoning
[C] lowers body-temperature
[D] stimulates formation of antibody
Show Answer
Correct Answer: D [stimulates formation of antibody]
Notes:
An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.
13. Hugo de Vries is related to which of the following theory of biology?
[A] aquatic ape theory
[B] modern anatomy
[C] Mutation Theory
[D] theory of evolution
Show Answer
Correct Answer: C [Mutation Theory]
Notes:
Hugo de Vries is a Dutch botanist and geneticist who pioneered the experimental study of biological evolution. His rediscovery of Gregor Mendel’s principles of heredity and his theory of biological mutation in 1900.
14. Which statement is true for the capsid?
[A] It consists of capsomeres
[B] This the outermost layer of most viruses
[C] It protects genetic material
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A capsid is the protein shell of a type of virus, which encloses its genetic material.
15. Microfilaments are made up of which protein?
[A] Tubulin
[B] Actin
[C] Myosin
[D] Chitin
Show Answer
Correct Answer: B [Actin]
Notes:
Microfilaments are composed of globular subunits of the protein actin. Actin monomers polymerize in the presence of ATP to form flexible helical filaments.
16. Dicotyledonous branches are found in which of the following?
[A] Fern
[B] Funaria
[C] Liverworts
[D] Marchantia
Show Answer
Correct Answer: C [Liverworts]
Notes:
Dicotyledonous branches are found in Liverworts. Liverworts are also moss-like land plants that do not have a vascular system.
17. The process of formation of seeds without fertilization in flowering plants is known as __.
[A] Budding
[B] Apomixis
[C] Sporulation
[D] Somatic hybridization
Show Answer
Correct Answer: B [Apomixis]
Notes:
The process of formation of seeds without fertilization in flowering plants is known as Apomixis.
18. Which of the following supports the upper part of the plant and acts as a transport system for nutrients, water, sugar, and starch?
[A] Stems
[B] Roots
[C] Leaves
[D] Flowers
Show Answer
Correct Answer: A [Stems]
Notes:
Stems support the upper part of the plant and act as a transport system for nutrients, water, sugar, and starch.
19. The tiny pores present on the leaves of plants are called__.
[A] Stomata
[B] Cells
[C] Chlorophyll
[D] Grains
Show Answer
Correct Answer: A [Stomata]
Notes:
The tiny pores present on the leaves of plants are called Stomata. Stomata are portals in plant leaves that control gas exchange for photosynthesis
20. What are the symptoms of the black arms in cotton?
[A] dark red to black lesions
[B] dark brown to black lesions
[C] dark green to black lesions
[D] None of these
Show Answer
Correct Answer: B [dark brown to black lesions]
Notes:
Black arm symptom is characterized by dark brown to black lesions that may occur simultaneously and extended necrosis then surrounds the stem with blockage of the vascular system at infected sites.
