MCQ | DOMESTICATION OF PLANTS

1. Process of hybridization is difficult because of

             (a)   Susceptibility to mutations

             (b)   Incompatibility and sterility

             (c)   Selection of suitable parents and hybrids

             (d)   All the above

2. The method of growing micro-organisms as a thin layer on nutrient medium is known as [AFMC 1987]

(a)   Thin layer growth system        (b) Support growth system

(c)   Suspended growth             (d)   None of these

3. As a general rule, inbreeding is possible between [AFMC 1991]

             (a)   Any two members of a order

             (b)   Any two members of a family

             (c)   Any two members of a genus

             (d)   Any two members of a species

4. Axenic culture is best defined as [CPMT 1993; AFMC 2000]

             (a)   Cell cultures

             (b)   Cell cultures free from micro-organisms

             (c)   Cell cultures of insectivorous plants

             (d)   Cell cultures free from other micro-organisms

5. For the formation of diploid cells from haploid cells, colchicine is used to                                                           [CBSE PMT 1996]

             (a)   Stop the spindle fibres formation

             (b)   Replicate DNA twicely in one cell cycle

             (c)   Stop the formation of centromere

             (d)   Stop the mitotic division

6. Insertion or deletion of one or more new genes which are absent in an organism by artificial method (not by reproduction) is called as          [CBSE PMT 1996]

             (a)   Molecular biology

             (b)   Genetic hybridization

             (c)   Cellular genetics

             (d)   Genetic engineering

7. Cryopreservation of germplasm is done at

[BVP 2001; Orissa 2005]

             (a)   0°C                                          (b)   – 50°C

             (c)   – 196°C                                  (d)   – 273°C

8. Manipulation of DNA in genetic engineering became possible due to the discovery of [CBSE PMT 2002]

(a)   Primase

(b)   Transcriptase

(c)   DNA ligase

(d)   Restriction endonuclease

9. Nucleic acid segment which is used to find the position of a gene and it forms a hybrid with this gene would be

[RPMT 2002]

(a)   Retrovirus                             (b)   Probe

(c)   Vector                                    (d)   Clone

7. (c) Cryopreservation at (liquid nitrogen) can maintain tissue culture, embryo, germplasm, etc.
8. (d) Isolation of restriction endonucleases by Nathans and Smith (1970) made it possible to cut DNA at specific sites.
9. (b) Probes are DNA or RNA strands with specific nucleotide sequences complementary to VNTR (Variable Number Tendem Repeats) sequences which are used to find the position of a gene and it form a hybrid with this gene.

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