Question

Select T and F for true and false statements respectively.
i) Birds living in nature lay eggs seasonally.
ii) Birds in captivity are made to lay eggs throughout the year.
iii) Captive birds laying eggs is related to reproduction.
iv) The females of placental mammals show cyclical changes in the activities of ovaries but have steady hormones during the reproductive phase.

• A. i-T, ii-T, iii-F, iv-F
• B. i-T, ii-F, iii-F, iv-T
• C. i-T, ii-T, iii-T, iv-F
• D. i-T, ii-T, iii-T, iv-T

Answer 1

The correct option is A i-T, ii-T, iii-F, iv-F

Oviparous organisms such as birds living in nature lay eggs only seasonally. But, birds in captivity, for example, in poultry farms are made to lay eggs throughout the year. Hence in this scenario, laying eggs is not related to reproduction rather it is a commercial exploitation for human welfare. The females of placental mammals show cyclical changes in the activities of
ovaries, accessory ducts and hormones during the reproductive phase. Such cyclical changes in non-primates occur during oestrus cycle and in primates, they occur during menstrual cycle.