(a) osteichthyes
(b) elasmobranchii
(c) bony fishes
(d) lung fishes
392 Q) The monocot plants lack the process of grafting. It is mainly due to lack of
(a) vascular tissue
(b) ground tissue
(c) parenchymatous tissue
(d) cambium tissue
Reason (R) Heart pace-maker electrically stimulates the contractile heart walls."
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
394 Q) Magnetic Resonance Imaging (MRI) is used in medical diagnosis to obtain images our internal body organs. This is primarily possible because
(a) our body possesses a permanent magnet
(b) MRI uses an external magnet to generate a magnetic field in our body
(c) MRI uses an external electric field to generate magnetic field in our body
(d) ions motions along our nerve cells generates magnetic field
395 Q) In which one among the following cell walls, the silica is abundantly found?
(a) cell wall of all monocots
(b) cell wall of all dicots
(c) cell wall of grass and horsetail
(d) cell wall of all gymnosperms
396 Q) Which among the following gland is known as " Clockwork gland" of human beings?
(a) Thyroid gland
(b) Pituitiary gland
(c) Pineal gland
(d) Gonads
397 Q) "Which of the following is the honey bee queen substance? "
(a) An ingredient of honey
(b) A pheromone secreted by the queen
(c) A type of wax used in cell construction
(d) An excretory product of the queen
398 Q) Which of the following vector spreads the ksala- azar in human beings?
(a) Mosquito
(b) Sand fly
(c) House fly
(d) Ticks
399 Q) Ilmas, a species of Camel family are found in
(a) Africa
(b) Australia
(c) South America
(d) North America
400 Q) The mad-cow disease in cattles is caused by
(a)virus
(b) bacteria
(c) protozoa
(d) prions
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