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Echinoderms are described as triploblastic and coelomate animals. What does this indicate about their embryonic development and body cavity?
The text mentions, 'They are triploblastic and coelomate animals.' Triploblastic means developing from three germ layers, and coelomate means possessing a true coelom.
Which of the following echinoderms is correctly matched with its common name?
From the examples given: 'Echinus (Sea urchin)', 'Antedon (Sea lily)', 'Cucumaria (Sea cucumber)', and 'Ophiura (Brittle star)'. Therefore, Cucumaria - Sea cucumber is the correct match.
Fertilisation in Echinodermata is typically:
The text states, 'Fertilisation is usually external' for Echinodermata.
The level of organisation observed in Echinodermata is:
The NCERT mentions that Echinoderms are 'All are marine with organ-system level of organisation'.
Which class of animals does not belong to Phylum Echinodermata?
Asteroidea, Echinoidea, and Crinoidea are classes within Echinodermata. Cephalopoda is a class within Phylum Mollusca, as seen in the example 'Octopus (Devil fish)' under Mollusca.
The spiny skin characteristic of Echinoderms is due to their:
The name Echinodermata means 'Spiny bodied' and refers to their endoskeleton of calcareous ossicles which often bear spines, giving them a spiny appearance. The summary also states, 'The echinoderms possess a spiny skin.'
Sexes for Echinodermata are described as:
The NCERT text specifies, 'Sexes are separate' for Echinodermata.
Which of the following statements is true regarding latent heat?
According to the NCERT text, 'The latent heat of fusion (Lf) is the heat per unit mass required to change a substance from solid into liquid at the same temperature and pressure. The latent heat of vaporisation (Lv) is the heat per unit mass required to change a substance from liquid to the vapour state without change in the temperature and pressure.' This clearly indicates that latent heat is associated with a change of state at constant temperature.
What is the SI unit of latent heat?
The NCERT text states, 'The amount of heat per unit mass transferred during change of state of the substance is called latent heat of the substance for the process. ... Its SI unit is J kg–1.' Therefore, the SI unit is Joules per kilogram.
A burn from steam at 100 °C is more severe than a burn from boiling water at 100 °C because:
The NCERT text explains, 'For water, the latent heat of fusion and vaporisation are $L_f = 3.33 imes 10^5 ext{ J kg}^{-1}$ and $L_v = 22.6 imes 10^5 ext{ J kg}^{-1}$, respectively. That is, $3.33 imes 10^5 ext{ J}$ of heat is needed to melt 1 kg ice at 0 °C, and $22.6 imes 10^5 ext{ J}$ of heat is needed to convert 1 kg water into steam at 100 °C. So, steam at 100 °C carries $22.6 imes 10^5 ext{ J kg}^{-1}$ more heat than water at 100 °C. This is why burns from steam are usually more serious than those from boiling water.' This additional heat is the latent heat of vaporization that is released when steam condenses.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.