The most important component of the oral contraceptive pills is
Progesterone
Growth hormone
Thyroxine
Luteinising hormone
A.
Progesterone
Use of Contraceptive pills is a widespread form of birth control. Contraceptive pills contain oestrogen and progesterone. The production of the pituitary hormones FSH and LH in the normal sexual cycle of a female is shut down by these hormones. In the absence of FSH, the ovarian follicles do not ripen and ovulation does not occur in the absence of LH.
A woman with two genes (one on each X-chromosome) for haemophilia and one gene for colour blindness on the X-chromosome marries a normal man. How will the progeny be?
All sons and daughters are haemophilic and colourblind
Haemophilic and colourblind daughters
50% haemophilic colourblind sons and 50% haemophilic sons
50% haemophilic daughters and 50% colourblind daughters
Which of the following is mismatched?
Vitamin K- Beriberi
Vitamin D-Rickets
Vitamin C - Scurvy
Vitamin A-Xerophthalmia
Secondary body cavity with segmented mesodermal lining is called
Haemocoel
Neurocoel
True Coelom
Pseudocoelom
The diversity in the type of beaks of finches adapted to different feeding habits on the Galapagos islands, as observed by Darwin, provides evidence for
Origin of species by natural selection
Intraspecific Variations
Intraspecific competition
Interspecific competition
Active immunity means
Resistance developed after disease
Increasing quantity of blood
Resistance developed before the disease
Increasing rate of heart beat
Which important green-house gas, other than carbon dioxide, is being produced from the agricultural fields?
Arsine
Sulphur dioxide
Ammonia
Nitrous oxide
