A marine cartilaginous fish that can produce electric current is [2014]
Pristis
Torpedo
Trygon
Scoliodon
(2)
Torpedo is a bottom-living marine fish, discharging electricity which is sufficient to stun preys such as small fishes, etc. A pair of electric organs are situated on the dorsal side of the trunk region. In fact, the electric organs are the modified lateral muscle-plates innervated by the cranial nerves.
All living members of the class Cyclostomata are : [2025]
Free living
Endoparasite
Symbiotic
Ectoparasite
(4)
All living members of class Cyclostomata are ectoparasites.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). [2025]
Assertion (A) : All vertebrates are chordates but all chordates are not vertebrate.
Reason (R) : The members of subphylum vertebrata possess notochord during the embryonic period, the notochord is replaced by cartilaginous or bony vertebral column in adults.
In the light of the above statements, choose the correct answer from the options given below:
Both (A) and (R) are true and (R) is the correct explanation of (A)
Both (A) and (R) are true but (R) is not the correct explanation of (A)
(A) is true but (R) is false
(A) is false but (R) is true
(1)
Both (A) and (R) are true and (R) is the correct explanation of (A).
The members of subphylum vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.
Thus, all vertebrates are chordates but all chordates are not vertebrates.
Role of the water vascular system in Echinoderms is : [2025]
A. Respiration and Locomotion
B. Excretion and Locomotion
C. Capture and transport of food
D. Digestion and Respiration
E. Digestion and Excretion
Choose the correct answer from the options given below :
A and B Only
A and C Only
B and C Only
B, D and E Only
(2)
Water vascular system in Echinoderms helps in locomotion, capture and transport of food and respiration. Excretory system is absent in echinoderms. Excretion takes place through general body surface.
