Choose the correct statement(s) with respect to Down's syndrome
i. Down's syndrome results from non-disjunction of $21^{\text {st }}$ chromosome during gamete formation.
ii. Down's syndrome is a sex chromosomal disorder observed in immature mothers who are below the age of 18 .
iii. These patients have mild mental retardation, poor skeletal development, flat hands, stubby fingers and palms are broader.
iv. The have 44 A with XO type of karyotype.
v. The risk of giving birth to a Down Syndrome child is more in mothers who are over 45 years of age.
What is the horizontal distribution of different species occupying levels on land or in water called?
Identify the element having highest value of first ionization enthalpy.
One mole of a perfect gas expands isothermally and reversibly from $10 \mathrm{dm}^3$ to $20 \mathrm{dm}^3$ at 300 K . Find $\Delta \mathrm{U}, \mathrm{q}$ and work done respectively in the process. $\left(\mathrm{R}=8.3 \times 10^{-3} \mathrm{~kJ} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)$
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