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An element with atomic number 107 has the official name Bohrium. What was its temporary IUPAC name?
For Z=107, the roots are un (1), nil (0), sept (7). Combining these with the 'ium' suffix gives Unnilseptium. Table 3.5 confirms that Bohrium is the official name for Unnilseptium (Z=107).
What is the numerical root for the digit '0' in IUPAC nomenclature for elements with Z > 100?
According to Table 3.4 'Notation for IUPAC nomenclature of Elements', the numerical root for the digit '0' is 'nil'.
Which of the following statements correctly describes the circulatory system in members of Phylum Hemichordata?
According to the NCERT text, 'Circulatory system is of open type' in Hemichordata. This means that the blood flows through open spaces (sinuses) rather than being confined to blood vessels throughout its circuit.
Respiration in Hemichordata primarily occurs through which of the following structures?
The NCERT text states, 'Respiration takes place through gills' for Hemichordata. Options o1, o2, and o4 are characteristic respiratory/excretory structures of Arthropods.
What is the primary excretory organ found in organisms belonging to Phylum Hemichordata?
The NCERT text explicitly mentions, 'Excretory organ is proboscis gland' for Hemichordata. Flame cells are found in Platyhelminthes, and metanephridia in Annelids.
Sexes in Hemichordata are described as 'separate'. This condition is also known as:
The term 'Sexes are separate' in biology is synonymous with dioecious, meaning male and female reproductive organs are in separate individuals. Hermaphroditic or monoecious implies both sexes are in the same individual.
Which of the following developmental patterns is characteristic of Hemichordata?
The NCERT text states, 'Development is indirect' for Hemichordata. Indirect development typically implies the presence of a larval stage before reaching the adult form.
Before being recognized as a separate phylum, Hemichordata was classified as a sub-phylum under which larger phylum?
The NCERT text explicitly states, 'Hemichordata was earlier considered as a sub-phylum under phylum Chordata. But now it is placed as a separate phylum under non-chordata.'
The body of a Hemichordate is distinctly divided into three regions. These regions are:
The NCERT text describes the Hemichordate body as 'composed of an anterior proboscis, a collar and a long trunk'.
Which of the following levels of organization is characteristic of Phylum Hemichordata?
The NCERT text states that Hemichordates are 'worm-like marine animals with organ-system level of organisation.' This is indicative of more complex animals where organs work together to form systems.
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