Biology MCQ

Biology MCQ
Biology - Online Multiple Choice Questions Quiz
GENERAL KNOWLEDGE: Biology mcq quiz
Free Online Multiple choice Solved Questions Biology


1. The chief role of nucleolus in a nucleus concerns
(a) Organization of chromosome.
(b) Ribosome synthesis
(c) Chromatid separation
(d) DNA replication
Ans. (b)


2. The word chromosome was given by
(a) Johannsen
(b) Waldeyer
(c) Benda
(d) Flemming
Ans. (b)


3. Chromosomes are concerned with
(a) Respiration
(b) Assimilation
(c) Transmission of hereditary-characters
(d) Nutrition
Ans. (c)


4. The centromere of a chromosome is also called
(a) Satellite
(b) Primary constriction
(c) Secondary constriction
(d) Centriole
Ans. (b)


5. A telocentric chromosome differs from an acrocentric chromosome in that
(a) The former has a sub terminal centrally located centromere
(b) The centromere in the former is terminal and latter has medially located centromere
(c) The former has sub terminal centromere and the latter has medially located centromere
(d) The former has terminal and the latter has sub terminal centromere
Ans. (d)


6. The principal protein of cilia and flagella is
(a) Tubulin
(b) Albumin
(c) Globulin
(d) Actin
Ans. (a)


7. In cell transport the difference between permeable transport and bulk transport relates to
(a) Structure of molecules allowed to pass through
(b) Solvent system as well as structure of molecules is applicable
(c) Molecular weight of atoms allowed passing through
(d) Solvent system is applicable
Ans. (a)


8. Tonoplast is a differentially permeable membrane surrounding the
(a) Cytoplasm
(b) Vacuole
(c) Nucleus
(d) Mitochondria
Ans. (b)


9. The term mitosis was given by
(a) Farmer
(b) Flemming
(c) Boveri
(d) Moore
Ans. (b)


10. The sequence in the cell cycle is
(a) S, G1, G2, M
(b) S, M, G1, G2
(c) G1, S, G2, M
(d) G2, S, M, G2
Ans. (c)


11. Which is the shortest phase in the cell cycle?
(a) G1
(b) G2
(c) S2
(d) M
Ans. (d)


12. How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G1 of the cell cycle?
(a) The daughter cells have half the amount of cytoplasm and half the amount of DNA
(b) The daughter cells have half the number of chromosomes and half the amount of
DNA
(c) The daughter cells have the same number of chromosomes and half the amount of
DNA
(d) The daughter cells have the same number of chromosomes and same amount of DNA
Ans. (d)

13. The role of mitosis is not merely to divide a cell into two daughter cells but to ensure genetic continuity from one cell generation to another cell generation. The mechanism ensuring genetic continuity is
(a) Formation of cells with new chromosomes
(b) Formation of two daughter cells
(c) Formation of two cells with identical DNA
(d) Halving the chromosome number between the two new cells
Ans. (c)

14. If cells in process of dividing are subjected to colchicine, a drug that interferes with the functioning of the spindle apparatus, at which stage will mitosis be arrested?
(a) Anaphase
(b) Prophase
(c) Telophase
(d) Metaphase
Ans. (d)

15. A stage of mitosis in which chromosomes get arranged in the form of an equatorial plate in the centre of a dividing cell is called
(a) Prophase
(b) Metaphase
(c) Anaphase
(d) Telophase
Ans. (b)

16. During mitosis, metaphase differs from anaphase in having
(a) Same number of chromosomes and half number of chromatids
(b) Half number of chromosomes and half number of chromatids
(c) Half number of chromosomes and same number of chromatids
(d) Same number of chromosomes and same number of chromatids
Ans. (c)

17. In which phase of mitosis the chromatids of chromosomes separate from eacb other?
(a) Anaphase
(b) Telophase
(c) Metaphase
(d) Prophase
Ans. (c)

18. The phragmoplast is organised
(a) At the beginning of anaphase
(b) At the end of anaphase
(c) At the beginning of telophase
(d) At the end of telophase
Ans. (b)

19. How many divisions must occur in a cell of root tip to form 128 cells?
(a) 128
(b) 127
(c) 64
(d) 3
Ans. (b)

20. The difference in the division of a plant cell and animal cell is in
(a) Spindle formation
(b) Cell plate formation
(c) Movement of chromosomes from the equatorial plane
(d) Coiling of the chromosomes
Ans. (b)

21. Meiosis involves
(a) One division of nucleus and one division of chromosome
(b) Two divisions of nucleus and one division of chromosome
(c) One division of nucleus and two divisions of chromosome
(d) Two divisions of nucleus and two divisions of chromosome
Ans. (b)

22. Which is the longest stage of meiotic division?
(a) Prophase
(b) 11etaphase
(c) Anaphase
(d) Telophase
Ans. (a)

23. During meiosis, crossing over occurs at
(a) Diplotene
(b) Leptotene
(c) Pachytene
(d) Diakinesis
Ans. (c)

24. At what phase of meiosis are homologous chromosomes separated?
(a) Prophase II
(b) Prophase I
(c) Anaphase I
(d) Anaphase II
Ans. (c)

25. The minimum number of meiotic divisions required to obtain 100 pollen grains of wheat
(a) 25
(b) 50
(c) 100
(d) 150
Ans. (a)