BIO 101 | Study Mode

Join Discuss Share Question Share to WhatsApp
Question 241
A
6 pairs 
B
4 pairs 
C
2 pairs 
D
Explanation.
Share Answer In each of the segments 7, 9, 12 and 13 is found a pair of large, thick, muscular and rhythmically contractile vertical vessels, called hearts. They pump blood from dorsal to ventral vessel, while flow in opposite direction is prevented by internal valves. Hearts of 7th and 9th segments connect dorsal and ventral vessels only and are called lateral hearts. Those of 12th and 13th segments connect both dorsal and supra- oesophageal vessels with ventral vessel, and are designated as latero-oesophageal hearts.

Correct Option:
B
Join Discuss Share Question Share to WhatsApp
Question 242
A
tapeworm 
B
roundworm 
C
pinworm 
D
liver fluke. 
Explanation.
Share Answer Cysticercus is the larval stage of tapeworm which is characterised by a large vesicle and one scolex. Cysticercus develops in adult tapeworm only when ingested by the human host. In pigs body it leads quite an inactive life and remains viable for several years, afte <br /> which it dies and becomes calcified. Pork (pigs flesh) containing viable cysticerci is called measly pork for its spotted appearance.

Correct Option:
A
Join Discuss Share Question Share to WhatsApp
Question 243
A
flame cells 
B
protonephridia 
C
malpighian tubules 
D
green glands. 
Explanation.
Share Answer Flame cells are scattered throughout parenchyma from which they remove metabolic wastes. A flame cell is of irregular shape, with granular cytoplasm and a nucleus. Bundle of cilia, or flame, arises from basal granules near nucleus. Cilia are enclosed into a funnel- shaped lumen formed by the terminal blind end of a capillary. Protonephridia are found in flatworms, malpighian tubules in insects and green glands in crustaceans.

Correct Option:
A
Join Discuss Share Question Share to WhatsApp
Question 244
A
branching 
B
spicules 
C
reproduction 
D
symmetry. 
Explanation.
Share Answer The phylum Porifera is divided into three classes : calcarea or calcispongiae, hexactinellida or hyalospongiae and demospongiae or Sclerospongiae, on the basis of spicules (skeleton). Class calcarea have calcareous spicules, class hexactinellida have siliceous spicules and class demospongiae have siliceous spicules or spongin fibres or both.

Correct Option:
B
Join Discuss Share Question Share to WhatsApp
Question 245
A
anal styles in male 
B
anal cerci in female 
C
anal style and antennae in females 
D
both B and C. 
Explanation.
Share Answer In male cockroach, 9th sternum bears a pair of short, unjointed thread-like anal styles which are absent in female. Anal cerci and antennae are present in both male and female cockroaches.

Correct Option:
A
Join Discuss Share Question Share to WhatsApp
Question 246
A
pheromone 
B
thyroxine 
C
ecdysone 
D
all of these. 
Explanation.
Share Answer Ecdysone is a steroid hormone, secreted by a pair of prothoracic glands in the thorax of insects and by Y organs in crustaceans, that stimulates moulting and metamorphosis. In insects its release is stimulated by prothoracicotropic hormone.

Correct Option:
C
Join Discuss Share Question Share to WhatsApp
Question 247
A
Pediculus 
B
Cimex 
C
Musca 
D
Xenopsylla. 
Explanation.
Share Answer Musca is the zoological name of house fly which is regarded as mechanical carrier of many diseases. It is very active and keeps on visiting on dirty things and eatables as well.

Correct Option:
C
Join Discuss Share Question Share to WhatsApp
Question 248
A
bilateral symmetry 
B
radial symmetry 
C
porous body 
D
soft skin. 
Explanation.
Share Answer Radial symmetry is the arrangement of parts in an organ or organism such that cutting through the centre of the structure in any direction produces two halves that are mirror images of each other. All animals belonging to the cnidaria (e.g. jellyfish) and echinodermata (e.g. starfish) are radially symmetrical.

Correct Option:
B
Join Discuss Share Question Share to WhatsApp
Question 249
A
tendency to charge with change in environment 
B
tendency to resist change 
C
disturbance in regulatory control 
D
plants and animal extracts used in homeopathy. 
Explanation.
Share Answer Homoeostasis is the regulation by an organism of the chemical composition of its body fluids and other aspects of its internal environment so that physiological processes can proceed at optimum rates. It involves monitoring changes in the external and internal environment by means of receptors and adjusting the composition of the body fluids accordingly; excretion and osmoregulation are important in this process. Example of honieostatic regulation are the maintenance of the acid-base balance and body temperature.

Correct Option:
B
Join Discuss Share Question Share to WhatsApp
Question 250
A
pronephros 
B
metanephros 
C
mesonephros 
D
opisthonephros. 
Explanation.
Share Answer Kidney of adult rabbit s metanephros. It is formed from the posterior end of the nephrogenic mesoderm which is displaced somewhat anteriorly and laterally.

Correct Option:
B
Previous Page Next Page
Question Map
Quiz link
Share BIO 101 with your friends
Share to WhatsApp Share Quiz CBT mode Study mode copy link