Viruses have

The correct relation between the degree of freedom $f$ and the ratio of specific heat $\gamma$ is -

Which of the following animals possesses a four-chambered heart?

The pair$(s)$ of diamagnetic ions is$(are)$
$(A) \ La ^{3+}, Ce ^{4+}$ $(B) \ Yb ^{2+}, Lu ^{3+}$ $(C) \ La ^{2+}, Ce ^{3+}$ $(D) \ Yb ^{3+}, Lu ^{2+}$

Curie temperature is the temperature above which

The longest phase of meiosis is ........