11. Which of the following is the name given to the population of cells derived from a single parent cell? (UPSC Prelims 1989)
[A] Haploid
[B] Diploid
[C] Symmetrical cell
[D] Clone
Show Answer
Correct Answer: D [Clone]
Notes:
Under suitable conditions, a single cell grows into a colony of cells on agar medium. The resulting population of genetically identical cells derived from a single parent cell is called a clone.
12. Which one of the following diseases is least infectious? (UPSC Prelims 1991)
[A] Leprosy
[B] Tuberculosis
[C] Conjunctivitis
[D] Hepatitis
Show Answer
Correct Answer: D [Hepatitis]
Notes:
Most noninfectious causes of hepatitis are not contagious. Hepatitis caused by alcohol poisoning, medications, or toxins or poisons are not transmitted from person to person.
13. Which one of the following is a useful functional association between fungi and the roots of higher plants? (UPSC Prelims 1999)
[A] Biofertilizer
[B] Coralloid root
[C] Lichen
[D] Mycorrhiza
Show Answer
Correct Answer: D [Mycorrhiza]
Notes:
A mycorrhiza is a symbiotic association between a fungus and a plant. The term mycorrhiza refers to the role of the fungus in the plant’s rhizosphere, its root system. Mycorrhizae play important roles in plant nutrition, soil biology and soil chemistry.
14. What does B denote in the term RBCs ?
[A] Build
[B] Blood
[C] Bloody
[D] Building
Show Answer
Correct Answer: B [Blood]
Notes:
The term RBC stands for Red Blood Cells (RBCs) which performs the function of transferring oxygen to other tissues of the body. The RBCs are also known as Red Blood Corpuscles.
15. Chromosome Theory of Inheritance was proposed by __?
[A] Pier Antonio Micheli
[B] Louis Pasteur
[C] Stephen Hales
[D] Thomas Hunt Morgan
Show Answer
Correct Answer: D [Thomas Hunt Morgan]
Notes:
The chromosomal theory of inheritance, or the idea that genes are located on chromosomes, was proposed based on the experiments of Thomas Hunt Morgan.
16. Which of the following biomolecules is more widely distributed in the cell?
[A] Chloroplast
[B] RNA
[C] DNA
[D] Spaherosomes
Show Answer
Correct Answer: B [RNA]
Notes:
DNA and RNA are two types of nucleic acids. DNA is converted into RNA by the process of transcription. The three types of RNA are m-RNA, t-RNA and r-RNA.
17. In which of the following β-oxidation mainly occurs?
[A] Mitochondria
[B] Cytoplasm
[C] Nucleus
[D] Chloroplast
Show Answer
Correct Answer: A [Mitochondria
]
Notes:
β-oxidation in mammals occurs in both mitochondria and peroxisomes, whereas plants and most fungi switch off β-oxidation.
18. What is Rancidity?
[A] Deterioration of Fat
[B] Deterioration of Glucose
[C] Deterioration of Protein
[D] Deterioration of Vitamins
Show Answer
Correct Answer: A [Deterioration of Fat]
Notes:
The process of oxidation of oily and Fatty food, which changes its taste and smell is known as Rancidity. Rancidity generally occurs in Fat.
19. Where are sexual reproduction and mobile cells absent?
[A] Chlorophyceae
[B] Rhodophyceae
[C] Myxophyceae
[D] Phaeophyceae
Show Answer
Correct Answer: C [Myxophyceae]
Notes:
Since being prokaryotic cells, they do not have chromosomes, so they lack sexual reproduction.
20. Which of the following do you consider the best evidence to show that the two species of algae are closely related.
[A] They both respire and release CO2
[B] They both are found in the same habitat
[C] They both reproduce asexually
[D] They both have same type of pigments
Show Answer
Correct Answer: D [They both have same type of pigments]
Notes:
The best evidence to show that the two species of algae are closely related is – They both have same type of pigments.
