{"id":86173,"date":"2025-06-01T03:39:25","date_gmt":"2025-06-01T03:39:25","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=86173"},"modified":"2025-06-01T03:39:25","modified_gmt":"2025-06-01T03:39:25","slug":"which-one-of-the-following-statements-about-variations-is-not-true","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-variations-is-not-true\/","title":{"rendered":"Which one of the following statements about variations is not true ?"},"content":{"rendered":"

Which one of the following statements about variations is not<\/b> true ?<\/p>\n

[amp_mcq option1=”Variation is minimum in asexual reproduction.” option2=”All variations in a species have equal chances of survival.” option3=”Changes in genetic constitution result in variation.” option4=”Variants can be selected by environmental factors.” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-2 – 2021<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nA) Variation is minimum in asexual reproduction: Asexual reproduction involves a single parent producing genetically identical offspring (clones) through mitosis. The only source of variation is random mutation. Sexual reproduction, involving two parents and meiosis with crossing over and independent assortment, creates much greater genetic variation through new combinations of genes. So, variation is indeed minimal in asexual reproduction compared to sexual reproduction. This statement is true.
\nB) All variations in a species have equal chances of survival: This statement is false. Survival is not random with respect to variations. Variations confer different traits on individuals. Depending on the environmental conditions, some traits (and thus the variations that cause them) may be advantageous, increasing an individual’s chances of survival and reproduction. Other variations may be disadvantageous, decreasing the chances of survival. This differential survival and reproduction based on variations is the basis of natural selection.
\nC) Changes in genetic constitution result in variation: Variations are heritable differences between individuals. These differences arise from changes in the genetic material (DNA), such as mutations (changes in nucleotide sequence) or rearrangements of chromosomes, as well as the combination of genes inherited from parents in sexually reproducing organisms. So, this statement is true.
\nD) Variants can be selected by environmental factors: This is a fundamental principle of evolution by natural selection. Environmental conditions act as selective pressures, favouring individuals with certain variations that make them better adapted to that environment. These individuals are more likely to survive and pass on their advantageous variations to their offspring. This statement is true.
\nThe statement that is NOT true is B.
\n<\/section>\n
\n– Variation arises from changes or combinations of genes.
\n– Sexual reproduction generates more variation than asexual reproduction.
\n– Natural selection acts on variations; survival is not equally likely for all variations.
\n– Environmental factors drive the selection of variants.
\n<\/section>\n
\nVariations are the raw material for evolution. Without variation, natural selection cannot occur, and populations would not be able to adapt to changing environments.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following statements about variations is not true ? [amp_mcq option1=”Variation is minimum in asexual reproduction.” option2=”All variations in a species have equal chances of survival.” option3=”Changes in genetic constitution result in variation.” option4=”Variants can be selected by environmental factors.” correct=”option2″] This question was previously asked in UPSC CDS-2 – 2021 Download … <\/p>\n

Detailed SolutionWhich one of the following statements about variations is not true ?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1088],"tags":[1110,1117,1412],"class_list":["post-86173","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","tag-1110","tag-biology","tag-evolution-of-life","no-featured-image-padding"],"yoast_head":"\nWhich one of the following statements about variations is not true ?<\/title>\n<meta name=\"description\" content=\"A) Variation is minimum in asexual reproduction: Asexual reproduction involves a single parent producing genetically identical offspring (clones) through mitosis. The only source of variation is random mutation. Sexual reproduction, involving two parents and meiosis with crossing over and independent assortment, creates much greater genetic variation through new combinations of genes. So, variation is indeed minimal in asexual reproduction compared to sexual reproduction. This statement is true. B) All variations in a species have equal chances of survival: This statement is false. Survival is not random with respect to variations. Variations confer different traits on individuals. Depending on the environmental conditions, some traits (and thus the variations that cause them) may be advantageous, increasing an individual's chances of survival and reproduction. Other variations may be disadvantageous, decreasing the chances of survival. This differential survival and reproduction based on variations is the basis of natural selection. C) Changes in genetic constitution result in variation: Variations are heritable differences between individuals. These differences arise from changes in the genetic material (DNA), such as mutations (changes in nucleotide sequence) or rearrangements of chromosomes, as well as the combination of genes inherited from parents in sexually reproducing organisms. So, this statement is true. D) Variants can be selected by environmental factors: This is a fundamental principle of evolution by natural selection. Environmental conditions act as selective pressures, favouring individuals with certain variations that make them better adapted to that environment. These individuals are more likely to survive and pass on their advantageous variations to their offspring. This statement is true. The statement that is NOT true is B. - Variation arises from changes or combinations of genes. - Sexual reproduction generates more variation than asexual reproduction. - Natural selection acts on variations; survival is not equally likely for all variations. - Environmental factors drive the selection of variants.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-variations-is-not-true\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following statements about variations is not true ?\" \/>\n<meta property=\"og:description\" content=\"A) Variation is minimum in asexual reproduction: Asexual reproduction involves a single parent producing genetically identical offspring (clones) through mitosis. The only source of variation is random mutation. Sexual reproduction, involving two parents and meiosis with crossing over and independent assortment, creates much greater genetic variation through new combinations of genes. So, variation is indeed minimal in asexual reproduction compared to sexual reproduction. This statement is true. B) All variations in a species have equal chances of survival: This statement is false. Survival is not random with respect to variations. Variations confer different traits on individuals. Depending on the environmental conditions, some traits (and thus the variations that cause them) may be advantageous, increasing an individual's chances of survival and reproduction. Other variations may be disadvantageous, decreasing the chances of survival. This differential survival and reproduction based on variations is the basis of natural selection. C) Changes in genetic constitution result in variation: Variations are heritable differences between individuals. These differences arise from changes in the genetic material (DNA), such as mutations (changes in nucleotide sequence) or rearrangements of chromosomes, as well as the combination of genes inherited from parents in sexually reproducing organisms. So, this statement is true. D) Variants can be selected by environmental factors: This is a fundamental principle of evolution by natural selection. Environmental conditions act as selective pressures, favouring individuals with certain variations that make them better adapted to that environment. These individuals are more likely to survive and pass on their advantageous variations to their offspring. This statement is true. The statement that is NOT true is B. - Variation arises from changes or combinations of genes. - Sexual reproduction generates more variation than asexual reproduction. - Natural selection acts on variations; survival is not equally likely for all variations. - Environmental factors drive the selection of variants.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-variations-is-not-true\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:39:25+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following statements about variations is not true ?","description":"A) Variation is minimum in asexual reproduction: Asexual reproduction involves a single parent producing genetically identical offspring (clones) through mitosis. The only source of variation is random mutation. Sexual reproduction, involving two parents and meiosis with crossing over and independent assortment, creates much greater genetic variation through new combinations of genes. So, variation is indeed minimal in asexual reproduction compared to sexual reproduction. This statement is true. B) All variations in a species have equal chances of survival: This statement is false. Survival is not random with respect to variations. Variations confer different traits on individuals. Depending on the environmental conditions, some traits (and thus the variations that cause them) may be advantageous, increasing an individual's chances of survival and reproduction. Other variations may be disadvantageous, decreasing the chances of survival. This differential survival and reproduction based on variations is the basis of natural selection. C) Changes in genetic constitution result in variation: Variations are heritable differences between individuals. These differences arise from changes in the genetic material (DNA), such as mutations (changes in nucleotide sequence) or rearrangements of chromosomes, as well as the combination of genes inherited from parents in sexually reproducing organisms. So, this statement is true. D) Variants can be selected by environmental factors: This is a fundamental principle of evolution by natural selection. Environmental conditions act as selective pressures, favouring individuals with certain variations that make them better adapted to that environment. These individuals are more likely to survive and pass on their advantageous variations to their offspring. This statement is true. The statement that is NOT true is B. - Variation arises from changes or combinations of genes. - Sexual reproduction generates more variation than asexual reproduction. - Natural selection acts on variations; survival is not equally likely for all variations. - Environmental factors drive the selection of variants.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-variations-is-not-true\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following statements about variations is not true ?","og_description":"A) Variation is minimum in asexual reproduction: Asexual reproduction involves a single parent producing genetically identical offspring (clones) through mitosis. The only source of variation is random mutation. Sexual reproduction, involving two parents and meiosis with crossing over and independent assortment, creates much greater genetic variation through new combinations of genes. So, variation is indeed minimal in asexual reproduction compared to sexual reproduction. This statement is true. B) All variations in a species have equal chances of survival: This statement is false. Survival is not random with respect to variations. Variations confer different traits on individuals. Depending on the environmental conditions, some traits (and thus the variations that cause them) may be advantageous, increasing an individual's chances of survival and reproduction. Other variations may be disadvantageous, decreasing the chances of survival. This differential survival and reproduction based on variations is the basis of natural selection. C) Changes in genetic constitution result in variation: Variations are heritable differences between individuals. These differences arise from changes in the genetic material (DNA), such as mutations (changes in nucleotide sequence) or rearrangements of chromosomes, as well as the combination of genes inherited from parents in sexually reproducing organisms. So, this statement is true. D) Variants can be selected by environmental factors: This is a fundamental principle of evolution by natural selection. Environmental conditions act as selective pressures, favouring individuals with certain variations that make them better adapted to that environment. These individuals are more likely to survive and pass on their advantageous variations to their offspring. This statement is true. The statement that is NOT true is B. - Variation arises from changes or combinations of genes. - Sexual reproduction generates more variation than asexual reproduction. - Natural selection acts on variations; survival is not equally likely for all variations. - Environmental factors drive the selection of variants.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-variations-is-not-true\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:39:25+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-variations-is-not-true\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-variations-is-not-true\/","name":"Which one of the following statements about variations is not true ?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:39:25+00:00","dateModified":"2025-06-01T03:39:25+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"A) Variation is minimum in asexual reproduction: Asexual reproduction involves a single parent producing genetically identical offspring (clones) through mitosis. The only source of variation is random mutation. Sexual reproduction, involving two parents and meiosis with crossing over and independent assortment, creates much greater genetic variation through new combinations of genes. So, variation is indeed minimal in asexual reproduction compared to sexual reproduction. This statement is true. B) All variations in a species have equal chances of survival: This statement is false. Survival is not random with respect to variations. Variations confer different traits on individuals. Depending on the environmental conditions, some traits (and thus the variations that cause them) may be advantageous, increasing an individual's chances of survival and reproduction. Other variations may be disadvantageous, decreasing the chances of survival. This differential survival and reproduction based on variations is the basis of natural selection. C) Changes in genetic constitution result in variation: Variations are heritable differences between individuals. These differences arise from changes in the genetic material (DNA), such as mutations (changes in nucleotide sequence) or rearrangements of chromosomes, as well as the combination of genes inherited from parents in sexually reproducing organisms. So, this statement is true. D) Variants can be selected by environmental factors: This is a fundamental principle of evolution by natural selection. Environmental conditions act as selective pressures, favouring individuals with certain variations that make them better adapted to that environment. These individuals are more likely to survive and pass on their advantageous variations to their offspring. This statement is true. 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