190. Which one of the following is a living fossil

a) Moss b) Saccharomyces

c) Spirogyra d) Cycas

Ans:d

191. In which one of the following habitats does the diurnal temperature of soil surface vary most

a) Forest b) Desert

c) Grassland d) Shrub land

Ans:b

192. The telomeres of eukaryotic chromosomes consist of short sequences of

a) Cytosine rich repeats

b) Adenine rich repeats

c) Guanine rich repeats

d) Thymine rich repeats

Ans:c

193. Which form of RNA has a structure resembling clover leaf

a) hnRNA b) mRNA

c) tRNA d) rRNA

Ans:c

194. A nutritionally wild type organism, which does not require any additional growth supplement is known as

a) Holotype b) Auxotroph

c) Prototroph d) Phenotype

Ans:c

195. Which of the following propagates through leaf-tip

a) Sprout - leaf plant

b) Marchantia

c) Moss d) Walking fern

Ans:d

196. Common indicator organism of water pollution is

a) Eichhornia crassipes

b) Escherichia coli

c) Entamoeba histolytica

d) Lemna pancicostata

Ans:b

197. ELISA is used to detect viruses, where

a) Southern blotting is done

b) Alkaline phosphatase is the key reagent

c) Catalase is the key reagent

d) DNA - probes are required

Ans:b

198. Phenetic classification of organisms is based on

a) The ancestral lineage of existing organisms

b) Dendogram based on DNA characteristics

c) Sexual characteristics

d) Observable characteristics of existing organisms

Ans:d

199. If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into

a) Telophase b) Anaphase

c) Prophase d) Metaphase

Ans:d

200. When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is

a) Pentaploidy b) Diploidy

c) Triploidy d) Tetraploidy

    Ans:d