Fill in the blanks with suitable words:
i) ……………….. is the only living genus under the subclass Nautiloidea.
ii) The mantle is innervated by ……………….. ganglia.
iii) The endoskeleton of most echinoderms is formed of ……………. .
iv) In echinoderms the system of coelomic canals and tube feet is called ………………….., ………………… system.
v) The larval stages of asteroids are ……………… and ………….. .
See Answer →State whether the following statements are ‘True’ or ‘False’:
i) Bivalves have adapted for filter feeding methods.
ii) The blood of cephalopods contains haemocyanin.
iii) Cephalopods have one of the best developed nervous systems among invertebrates.
iv) Development in bivalves includes trochophore and veliger larvae.
Moulting in insects
See Answer →Compound eye of insects
See Answer →Indicate whether the following statements are ‘True’ or ‘False’.
i) There are six pairs of appendages in the head of crustaceans corresponding to six segments.
ii) Malacostracans account for over 60% of all the crustaceans.
Choose the correct word from the alternative given:
i) Trilobites are an extinct group of primitive/advanced arthropods.
ii) Spiders, ticks, mites and scorpions are included under the class Eurypterida/Arachnida.
iii) Spinning organs or spinnerets are characterstic of Araneae/Acarina.
What do you mean by true coelomates? Discuss their advantages.
See Answer →Arrange the character most appropriate to the class of Platyhelminthes against it.
| Classes | Characters |
| a) Turbellaria | i) Presence of scolex |
| b) Monogenea | ii) Presence of oral and ventral suckers, but no hooks |
| c) Trematoda | iii) Presence of posterior hooks, suckers, clamps etc |
| d) Cestoda | iv) Ciliated epidermal cells covering the body |
See Answer →
Which of the words given in the parantesis is correct?
Flame cells in platyhelmninthes are ……………….. in function. (excretory/osmoregulatory)
See Answer →Write true (T) or false (F) in the space provided against each statement.
i) Cnidocyte has a hair like cnidocil which acts as a trigger.
ii) Medusae are asexual zooids.
iii) Obelia colony is bimorphic.
iv) Obelia is a fresh water plant like animal found attached to substratum.
v) Gonangium is a sexual way of reproduction.
Complete the following sentences inserting appropriate words in blanks:
i) Porifera are ………………. cellular animals incapable of ……………… as they remain to the substratum like a ………………… .
ii) The sponge body is covered by an outer epithelial layer made up of ………………….. .
iii) Sponges with skeleton made up of spicules of calcium carbonate belong to the class …………………. .
See Answer →| i) frontal plane | a) Divides body into left and right |
| ii) sagittal plane | b) Only one imaginary line divides the body into mirror images |
| iii) bilateral symmetry | c) Cannot be divided into mirror images |
| iv) asymmetrical | d) Divides body into dorsal and ventral parts |
See Answer →
Which of the following is not true for animals with radial symmetry?
i) Non front and back ends
ii) Are always sessile
iii) No left or right sides
iv) Face the environment from all sides
List three unique features of Phylum Ciliophora.
See Answer →What is the difference between dinoflagellates and apicomplexans?
See Answer →State Kirchoff’s law and derive the expression for the law. Also explain what is a gray surface?
See Answer →What is a black body and what are its characteristics?
See Answer →Explain the following terms: i) Radiosity ii) Emission iii) Spectral Intensity
See Answer →Explain with the help of a diagram the concept of hydrodynamic and thermal boundary layer for a laminar flow over a thin flat plate. Also define critical Reynolds number and the physical significance of Prandtl number?
See Answer →Derive the expression for the temperature reached by a solid at a given time ‘t’ in case of transient heat conduction.
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