Which of the following refers to correct example(s) of organisms that 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 | Concept of Organic Evolution: Evidence |
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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 |
 79%
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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 |
 83%
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The plant parts which consist of two generations, one within the other, are:

(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:  Post Pollination Events |
NEET - 2020
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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 |
 79%
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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 |
 77%
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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 (OLD NCERT) |
 83%
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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. Crossbreeding

3. Inbreeding

4. Outcrossing

Subtopic:  Animal Husbandry (OLD NCERT) |
 81%
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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 |
 92%
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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 |
 70%
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