Biology MCQs
31. Melatonin is a hormone secreted by __
[A] Pituitary gland
[B] Gonads
[C] Pineal gland
[D] Adrenal glands
[B] Gonads
[C] Pineal gland
[D] Adrenal glands
Correct Answer: C [Pineal gland]
Notes:
Melatonin is a hormone secreted by the Pineal gland. It is a peptide hormone.
Melatonin is a hormone secreted by the Pineal gland. It is a peptide hormone.
32. Which of the following are viral diseases of animals?
[A] Venezuelan equine encephalomyelitis
[B] African swine fever
[C] Both 1 and 2
[D] Neither 1 and 2
[B] African swine fever
[C] Both 1 and 2
[D] Neither 1 and 2
Correct Answer: C [Both 1 and 2]
Notes:
Venezuelan equine encephalomyelitis and African swine fever are viral diseases of animals.
Venezuelan equine encephalomyelitis and African swine fever are viral diseases of animals.
33. Haemophilia is caused by __
[A] Bacteria
[B] Virus
[C] Genetic mutation
[D] Cause unknown
[B] Virus
[C] Genetic mutation
[D] Cause unknown
Correct Answer: C [Genetic mutation]
Notes:
Haemophilia is called bleeder disease. It is a disorder that is linked to sex and is a recurring condition. Blood does not clot in a patient with hemophilia.
Haemophilia is called bleeder disease. It is a disorder that is linked to sex and is a recurring condition. Blood does not clot in a patient with hemophilia.
34. Which one of the following features is absent in a virus?
[A] Presence of cell wall
[B] Reproduce within host cell
[C] Fully parasitic in nature
[D] Presence of either DNA or RNA
[B] Reproduce within host cell
[C] Fully parasitic in nature
[D] Presence of either DNA or RNA
Correct Answer: A [Presence of cell wall]
Notes:
A virus has a simple structure. It has no internal cellular structure, no cell wall or cell membrane, just the protein coat that holds the string of nucleic acid. It is made only of a nucleic acid + a protein coat. A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea.
A virus has a simple structure. It has no internal cellular structure, no cell wall or cell membrane, just the protein coat that holds the string of nucleic acid. It is made only of a nucleic acid + a protein coat. A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea.
35. In Angiosperms, plant embryos in seed have structures called ____:
[A] Buds
[B] Spore
[C] Sprout
[D] Cotyledon
[B] Spore
[C] Sprout
[D] Cotyledon
Correct Answer: D [Cotyledon]
Notes:
The word angiosperm means seed. The seeds develop inside an organ which is modified to become a fruit. These are also called flowering plants. Plant embryos in seeds have structures called cotyledons. Cotyledons are called ‘seed leaves’ because in many instances they emerge and become green when the seed germinates.
The word angiosperm means seed. The seeds develop inside an organ which is modified to become a fruit. These are also called flowering plants. Plant embryos in seeds have structures called cotyledons. Cotyledons are called ‘seed leaves’ because in many instances they emerge and become green when the seed germinates.
36. Night blindness is caused due to ____:
[A] Excess secretion of pineal gland
[B] Less drinking of water
[C] Vitamin A deficiency
[D] Inheritance by X-chromosome
[B] Less drinking of water
[C] Vitamin A deficiency
[D] Inheritance by X-chromosome
Correct Answer: C [Vitamin A deficiency]
Notes:
Vitamin A deficiency results in night blindness, the inability or reduced ability to see in dim light or darkness. Also known as nyctalopia, night blindness is due to a disorder of the cells in the retina that are responsible for vision in dim light which is caused by Vitamin A deficiency.
Vitamin A deficiency results in night blindness, the inability or reduced ability to see in dim light or darkness. Also known as nyctalopia, night blindness is due to a disorder of the cells in the retina that are responsible for vision in dim light which is caused by Vitamin A deficiency.
37. Which of the following plants is carnivorous?
[A] Cypress Vine
[B] Venus Flytrap
[C] Amaryllis
[D] Hyacinth
[B] Venus Flytrap
[C] Amaryllis
[D] Hyacinth
Correct Answer: B [Venus Flytrap]
Notes:
The Venus flytrap (Dionaea muscipula) is a carnivorous plant native to subtropical
wetlands on the East Coast of the United States in North Carolina and South Carolina. It catches its prey chiefly insects and arachnids with a trapping structure formed by the terminal portion of each of the plant’s leaves, which is triggered by tiny hairs on their inner surfaces.
The Venus flytrap (Dionaea muscipula) is a carnivorous plant native to subtropical
wetlands on the East Coast of the United States in North Carolina and South Carolina. It catches its prey chiefly insects and arachnids with a trapping structure formed by the terminal portion of each of the plant’s leaves, which is triggered by tiny hairs on their inner surfaces.
38. Which of the following is not correct?
[A] Members of Chlorophyceae are commonly called green algae
[B] Members of Phaeophyceae are commonly called red algae
[C] Members of Rhodophyceae are commonly called red algae
[D] Members of Phaeophyceae are commonly called brown algae
[B] Members of Phaeophyceae are commonly called red algae
[C] Members of Rhodophyceae are commonly called red algae
[D] Members of Phaeophyceae are commonly called brown algae
Correct Answer: B [Members of Phaeophyceae are commonly called red algae]
Notes:
Phaeophyceae is a large group of algae consisting of 240 genera and over 1,500 species out of which 32 genera and 93 species are reported from India. They are commonly known as brown algae, due to the presence of a golden-brown xanthophyll pigment, fucoxanthin (C40H54O6) in the chromatophores.
Phaeophyceae is a large group of algae consisting of 240 genera and over 1,500 species out of which 32 genera and 93 species are reported from India. They are commonly known as brown algae, due to the presence of a golden-brown xanthophyll pigment, fucoxanthin (C40H54O6) in the chromatophores.
39. The name of first mammal clone sheep is ____:
[A] Noori
[B] Durga
[C] Dolly
[D] Louise
[B] Durga
[C] Dolly
[D] Louise
Correct Answer: C [Dolly]
Notes:
Dolly was the world’s first cloned sheep. It was born on 5 July, 1996. It was a female domestic sheep, and the first mammal cloned from an adult somatic cell, using the process of nuclear transfer. Dolly was cloned by Ian Wilmut, Keith Campbell and colleagues at the Roslin Institute, part of the University of Edinburgh, Scotland.
Dolly was the world’s first cloned sheep. It was born on 5 July, 1996. It was a female domestic sheep, and the first mammal cloned from an adult somatic cell, using the process of nuclear transfer. Dolly was cloned by Ian Wilmut, Keith Campbell and colleagues at the Roslin Institute, part of the University of Edinburgh, Scotland.
40. Cellulose is a polymer of ____:
[A] Fructose
[B] Glucose
[C] Sucrose
[D] Galactose
[B] Glucose
[C] Sucrose
[D] Galactose
Correct Answer: B [Glucose]
Notes:
Cellulose consists of a long chain, or polymer, of glucose units. Because cellulose is built out of a sugar monomer, it is called a polysaccharide. Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. 62
[D] Microorganisms or microbes are microscopic organisms that exist as unicellular, multicellular, or cell clusters. Microorganisms are classified into four major groups mainly bacteria, fungi, protozoa and some algae.
Cellulose consists of a long chain, or polymer, of glucose units. Because cellulose is built out of a sugar monomer, it is called a polysaccharide. Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. 62
[D] Microorganisms or microbes are microscopic organisms that exist as unicellular, multicellular, or cell clusters. Microorganisms are classified into four major groups mainly bacteria, fungi, protozoa and some algae.
