Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following phyla exhibits a 'post-anal part (tail)' as a defining characteristic?
Table 4.1 explicitly lists 'A post-anal part (tail) is present' as a characteristic of Chordates, while Non-chordates lack a post-anal tail.
The circulatory system in Chordata is described as:
The initial description of Chordata states, 'They possess a post anal tail and a closed circulatory system.'
Which of the following correctly lists the taxonomic hierarchy for Humans starting from Phylum?
Table 1.1 provides the taxonomic categories for Man: Phylum - Chordata, Class - Mammalia, Order - Primata, Family - Hominidae, Genus - Homo, Species - Homo sapiens. The correct ascending order from Phylum is Chordata, Mammalia, Primata, Hominidae, Homo, Homo sapiens.
Which of the following elements has a significantly higher relative abundance in any living organism compared to the Earth's crust?
According to Table 9.1, the relative abundance of Carbon (C) is 18.5% in the human body compared to 0.03% in the Earth's crust, which is a significant difference. While Oxygen is abundant in both, its relative abundance difference is not as striking as carbon and hydrogen. Silicon is abundant in the Earth's crust but negligible in the human body. Calcium also shows a higher percentage in living tissues but not as comparatively high as carbon.
When a living tissue is subjected to elemental analysis, which of the following elements is typically found in 'ash' after complete burning?
The context states: 'Now if the tissue is fully burnt, all the carbon compounds are oxidised to gaseous form (CO2, water vapour) and are removed. What is remaining is called ‘ash’. This ash contains inorganic elements (like calcium, magnesium etc).' Therefore, magnesium would be found in the ash.
The acid-soluble pool obtained after grinding a living tissue in trichloroacetic acid represents primarily:
The text states: 'Scientists have found thousands of organic compounds in the acid-soluble pool.' Later, it clarifies that 'They have molecular weights ranging from 18 to around 800 daltons (Da) approximately.' This indicates small molecular weight organic compounds. The acid-insoluble fraction contains macromolecules and membrane fragments.
Which of the following organic compounds is NOT strictly considered a macromolecule despite being found in the acid-insoluble fraction?
The NCERT text explicitly states: 'Lipids are not strictly macromolecules. The acid insoluble fraction, has only four types of organic compounds i.e., proteins, nucleic acids, polysaccharides and lipids. These classes of compounds with the exception of lipids, have molecular weights in the range of ten thousand daltons and above.' Lipids are found in the acid insoluble fraction because they form vesicles from broken cell membranes, which are not water-soluble, not primarily due to their macromolecular size.
What is the approximate molecular weight range of compounds found in the acid-soluble pool?
The text mentions: 'There is one feature common to all those compounds found in the acid soluble pool. They have molecular weights ranging from 18 to around 800 daltons (Da) approximately.'
According to the average composition of cells, which component constitutes the highest percentage of total cellular mass after water?
Table 9.4 shows: Water (70-90%), Proteins (10-15%), Carbohydrates (3%), Lipids (2%), Nucleic acids (5-7%). Therefore, proteins constitute the highest percentage after water.
The remaining material after fully burning a living tissue, with all carbon compounds oxidized to gaseous forms, is called:
The text states: 'Now if the tissue is fully burnt, all the carbon compounds are oxidised to gaseous form (CO2, water vapour) and are removed. What is remaining is called ‘ash’.'
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