Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?

(a) Darwin's Finches of Galapagos islands

(b) Herbicide resistant weeds

(c) Drug resistant eukaryotes

(d) Man-created breeds of domesticated animals like dogs

(1) (a) and (c)

(2) (b), (c) and (d)

(3) only (d) 

(4) only (a) 

Subtopic:  Darwin's Theory |
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Meiotic division of the secondary oocyte is completed:

(1) At the time of copulation

(2) After zygote formation

(3) At the time of fusion of a sperm with an ovum

(4) Prior to ovulation

Subtopic:  Fertilization: Part 1 | Fertilization |
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Which of the following is correct about viroids?

(1) They have free RNA without protein coat

(2) They have DNA with protein coat

(3) They have free DNA without protein coat

(4) They have RNA with protein coat

Subtopic:  Virus, Viroids & Prions |
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The plant parts which consists of two generations one within the other:

(a) Pollen grains inside the anther

(b) Germinated pollen grain with two male gametes

(c) Seed inside the fruit

(d) Embryo sac inside the ovule

(1) (a), (b) and (c)

(2) (c) and (d)

(3) (a) and (d) 

(4) (a) only 

Subtopic:  Seed |
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Experimental verification of the chromosomal theory of inheritance was done by:

(1) Sutton

(2) Boveri

(3) Morgan

(4) Mendel

Subtopic:  Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations |
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Which of the following pairs is of unicellular algae?

 1. Gelidium and Gracilaria

2. Anabaena and Volvox

3. Chlorella and Spirulina

4. Laminaria and Sargassum

Subtopic:  Algae |
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Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:

1. Growth response

2. Defence action

3. Effect on reproduction

4. Nutritive value

Subtopic:  Response of Organisms to Abiotic Factors |
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By which method was a new breed 'Hisardale' of sheep found by using Bikaneri ewes and Marina rams?

1. Mutational breeding

2. Cross breeding

3. Inbreeding

4. Out crossing

Subtopic:  Animal Husbandry |
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The infectious stage of plasmodium that enters the human body is:

1. Sporozoites

2. Female gametocytes

3. Male gametocytes

4. Trophozoites

Subtopic:  Treatment & Life Cycle of Malaria |
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The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and early morning is:

1. Root pressure

2. Imbibition

3. Plasmolysis

4. Transpiration

Subtopic:  Transpiration & Guttation |
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