Multiple Choice QuestionsWhich of the following preventive measures is adopted to avoid mental retardation?
Relatives should not marry each other
Consumption of drugs and liquors should be avoided by pregnant mothers
Mother and child, both should be saved from infections diseases
All of the above
Physical trauma during pregnancy may cause
mental retardation
blindness
deafness
All of the above
Other than the nucleus which cellular organelle contains DNA?
Ribosome
Golgi complex
Mitochondria
Lysosome
Which one of the following are acoelomate animals?
Echinoderms
Annelids
Arthropods
Platyhelminthes
Which type of centrum is found in the vertebra of mammals?
Amphiplaytan
Heterocoelous
Procoelous
Amphicoelous
In the absence of light, what will increase?
Water uptake
Elongation of internodes
Uptake of mineral salts
Extension of leaf lamina
B.
Elongation of internodes
Etiolation is a process in flowering plants grown in the partial or complete absence of light. It includes elongation of stems and leaves, weakening of cell walls in stems and leaves, longer internodes hence fewer leaves per unit length of the stem, and chlorosis i.e. a pale yellowish-white color.
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