STD 12 - 6. evolution — NEET STD 11 Science — Question

Animal which passes water current through its body for food is

Which of the following animals maintain ecological balance?

Which of the following is incorrect regarding Analogy ?
(i) Organs having similar functions but different in their basic plan of development are known as analogous organs.
(ii) Vertebrate hearts or brains is a examples of analogy.
(iii) Analogous structures are result of convergent evolution.
(iv) Flippers of Penguins and Dolphins are examples of analogy.
(v) Sweet potato and Potato represents analogy.
(vi) Eyes of Rabbits and Rat are analogous organs.

Identify correct pair

Which of the following is used as 'clotbuster'. For removing clots from blood vessels of patient who have undergone myocardial infartion

Assertion: Histamine is related with allergic and inflammatory reactions.

Reason: Histamine is a vasodilator.

The chemical messengers produced in ductless glands are:

Treatment of waste-water is done by the

Hypothalamus is a part of brain but also secrete some hormones. Which of the following characters are correct for hypothalamus ?
(i) These hormones regulate the synthesis and secretion of pituitary hormones.
(ii) The hormones produced by hypothalamus are of two types, the releasing hormones and the inhibiting hormones.
(iii) Gonadotropin releasing hormone (GnRH) is a releasing hormone.
(iv) Somatostatin is a releasing hormone.
(v) Hormones of hypothalamus reach the anterior pituitary gland through a portal circulatory system.
(vi) The posterior pituitary is under the direct neural regulation of the hypothalamus.

Reabsorption in the tubules of nephrons occurs by the process of