Which of the following characters are seen in an individual with trisomy of chromosome number 21 ?
A. Psychomotor and mental development is retarded
B. Mental retardation
C. Presence of gynaecomastia
D. Loss of skin pigmentation

Physical , psychomotor and mental development is retarded in an individual affected with

Physical , psychromotor and mental development is retarded in an individual affected with

Physical , psychromotor and mental development is retarded in an individual affected with

Which of the following is not a characteristic of mental retardation?

Which of the following disorders does not cause mental retardation in humans?

Which of the following is a prime number 19 (b) 20 (c) 21 (d) 22

Which of the following character should be present in individual who wish to go for trekking or mountain climbing? A. Person should be athletic. B. Person should be mentally strong so that he can overcome tough conditions. C. Person should not be acrophobic. D. Person should not have allergy from excessive cold and should not have asthma or any breathing problem. E. Person should have sufficient haemoglobin in the blood.

Which of the following characters are most important taxonomically to differentiate angiosperms from the gymnosperms ? (a) Triploid endosperm (b) seeds enclosed in fruit (c) attractive petals (d) presence of vessels in xylem.