Short Questions and Answers
One Mark Questions with Answers
1. The adults are radially symmetrical but larvae exhibit bilateral symmetry in
Answer: (c) echinodermata
2. Most appropriate term for the life cycle of Obelia is
(a) alternation of generations
Answer: (b) metagenesis
3. Which of the following belongs to anthozoa?
Answer: (b) Fungia
4. Which disease is caused by female Culex?
Answer: (d) Filariasis
5. Which of the following sense organs is present in Ascaris are chemoreceptors and located in anterior part?
(a) pineal spicules
(b) Pineal setae
(d) Copulatory Bursa
Answer: (c) Amphids
6. Male genital apertures of earthworm are located in the segment
Answer: (d) 18
7. Which of the following does not have any elementary canal?
Answer: (a) Taenia
8. Honey mainly consists of
Answer: (c) monosaccharides
9. Hind wings of mosquitoes are termed as
Answer: (b) halters
10. Unfertilized eggs in honey bees develop into
(a) fertile males
(b) sterile females
(c) sterile males
(d) fertile females
Answer: (a) fertile males
11. Motile, elongated, zygote of plasmodium is found in
(a) salivary gland of mosquito
(b) gut of mosquito
(c) human liver
(d) human RBCs
Answer: (b) gut of mosquito
12. Fish which eradicate the mosquito larvae is
Answer: (a) Gambusia
13. The canal system is a characteristic feature of
Answer: (d) Sponges
14. Malignant tertian malaria is caused by
(a) Plasmodium vivax
(b) Plasmodium ovale
(c) Plasmodium falciparum
(d) Plasmodium malariae
Answer: (c) Plasmodium falciparum
15. Prawn heart carries
(a) oxygenated blood
(b) deoxygenated blood
(d) no blood
Answer: (a) oxygenated blood
Two Marks Questions with Answers
1. What are the symptoms of a disease caused by Fasciola hepatica in sheep?
Answer: It causes a disease known as liver rot. The infected animal feels great muscular weakness resulting in muscular pain. The liver enlarges and the bile ducts are blocked. The disease may prove fatal to the animal.
2. Write about sexual dimorphism in Nemathelminthes.
Answer: There is distinct sexual dimorphism. The female is larger than the male. The tail of male is coiled like tendril and has a pair of unequal copulatory apicules. Female has an anus while male bears cloacal aperture.
3. Mention the unique features of phylum Platyhelminthes.
Answer: (a) parenchymatous tissue filling the space between the body wall and the viscera
(b) flame cells for excretion and osmoregulation
(c) ladder like nervous system
(d) self fertlization occurs in some flatworm, example, Tapeworms.
(e) regeneration is well marked in some flatworms, example, Planaria.
4. Differentiate between butterfly and moth.
Answer: Butterfly is diurnal while moth is nocturnal. The body of butterfly is not robust while the body of moth is robust. The antennae of the butterfly are knobbed distally while the antennae of moth taper distally. Butterfly when at rest keeps the wings held together vertical on its back while moth keeps the wing held out horizontally when it is at rest.
5. Differentiate between male and female Ascaris.
Answer: Male ascaris is smaller than the female ascaris. The posterior end of male ascaris is curved while the posterior end of female ascaris is straight. A cloaca for receiving anus and genital opening is present in male ascaris while in female there are separate anus and genital aperture. Two equal chitinous spicules project through cloacal aperture while spicules are absent in female ascaris.
Three Marks Questions with Answers
1. Mention the important characters of Balanoglossus.
Answer: It is worm like, cylindrical, bilaterally symmetrical and elongated animal. The body is uniformly ciliated without exoskeleton or external appendages. The body is divisible into three regions; proboscis, collar and trunk. Proboscis appears as a tongue like projection, hence the name ‘tongue worm’. Collar is the muscular region which bears mouth ventrally below the proboscis stalk. Trunk is divisible into three regions; the anterior branchio genital region which has gill pores and gonads. The lateral regions containing the gonads are thin and flat and form genital wings. The middle of hepatic region is marked externally with regular elevations due to sacculations formed by projecting hepatic caeca of the intestine. The posterior abdominal region gradually tapers posteriorly and bears a terminal anus.
2. Mention some of the unique features of phylum Coelenterata.
Answer: (a) tissue level of organisation
(b) incomplete digestive tract surrounded by body wall
(c) presence of cnidoblasts for defence and offence
(d) epitheliomuscular cells play role of epithelium and musculature.
(e) gonads ( i.e.,testes, ovaries) without gonoducts.
(f) network of nerve cells acting as nervous system.
3. Mention some of the unique features of phylum Mollusca.
Answer: (a) Body is soft and consists of head, visceral mass and foot.
(b) Mantle covers the body.
(c) Mantle may be surrounded by shell.
(d) The buccal cavity has radula in some individuals
(e) Nervous system consists of cerebral, visceral, pleural and pedal ganglia.
(f) Mollusca is the second largest animal phylum after arthropoda.
4. Write a brief note on canal system in sponges.
Answer: The body of sponge is organised in such a manner as to form a complex system of pores and canals. This system is called canal system. Three types of canal systems are found is sponges; ascon type which is the simplest type of canal system found in Leucosolenia and a few other sponges, second is the sycon type which is more complex than the ascon type. It is found in sycon and some other sponges. The third type is leucon type. It is most complex canal system which is found in Spongillia and some other sponges.
5. Mention some of the unique features of phylum Arthropoda.
Answer: (a) jointed appendages
(b) thick exoskeleton of chitinous plates
(c) compound eyes
(e) antennary glands, malpighian tubules and coxal glands for excretion and osmoregulation
(f) trachea, gills and book lungs as respiratory organs