Hydra has

$\begin{array}{|l|l|} \hline Column-I & Column-II \\ \hline 1.\,\,Osculum & p.\,\,Fasciola \\ \hline 2.\,\,Hypostom & q.\,\,Ctenoplana \\ \hline 3.\,\,Comb\,\,jellies & r.\,\,Spongilla \\ \hline 4.\,\,Hook\,\,and\,\,sucker & s.\,\,Meandrina \\ \hline \end{array}$

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Heart rate is increased by all the following except

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Steroid hormones work as

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The law of segregation of characters is also called the law of purity of gametes because

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Read the following and choose the option with all incorrect statements.
(i) The number of parathyroid gland present in human is four.
(ii) Parathyroid hormone decreases the Ca²⁺ levels in the blood and so its called hypocalcemic hormone.
(iii) Thymus glands secretes the peptide hormones called thymosins.
(iv) Adrenaline and nonadrenaline hormones are commonly called catecholamines, secreted by cortex part of adrenal gland and are called emergency hormones.
(v) The adrenal cortex can be divided into three layers called zona reticularis (outer layer); zona glomerulosa (middle layer) and zona fasciculata (inner layer). It secretes many hormones commonly called as corticoids.
(vi) The corticoids involved in carbohydrate metabolism are called glucocorticoid.
(vii) In our body, cortisol is the main glucocorticoid.
(viii) Aldosterone is the main mineralocorticoid in our body.
(ix) In pancreas, the α-cells secrete a hormone called glucagon, while ẞ-cells secrete insulin.
(x) Glucagon is peptide hormone which decrease blood sugar level and so called hypoglycemic hormone.

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Cancer causing viruses are called

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Systolic pressure in adult human is