STD 11 - 16. Excretory product and their elimination — NEET STD 11 Science — Question

Haemoglobin forms compound with

Big holes in swiss cheese are made by a

The petromyzon belongs to

Which one of the following statements are correct ?
(i) Neutrophils and monocytes leucocytes are phagocytic cell; basophils are involved in inflammatory reactions; and eosinophils are associated with allergic reaction.
(ii) Lymphocytes are of two major types - B and T forms. They are responsible for immune response of the body.
(iii) Platelets are also called thrombocytes and are cell fragments produced from microkaryocytes. Blood normally contains 1,500,00-3,500,00 platelets mm^-3.
(iv) Person with O blood groups are called as universal donor' and person with AB blood groups are 'universal recipients".
(v) A condition in which Rh-ve mother has successive pregnancy with Rh-ve foetus is called Erythroblastosis foetalis, which can be fatal to foetus due to production of Rh antibodies by mother. This can be avoided by administering antiRh antibodies to the mother immediately after the delivery of first child.
(vi) Fibrins are formed by the conversion of inactive fibrinogens in plasma by the enzyme thrombokinase.
(vii) Prothrombin are converted into thrombins byenzyme complex thrombokinase.
(viii) Calcium ions plays important role in clotting of blood.
(ix) The fluid present in the lymphatic system is called lymph. It help in absorption of proteins by lacteals present in the intestinal villi.
(x) Fishes has 2 chambered heart; amphibians have 3 and mammals have 4 chambered heart.
(xi) Heart is endodermal in origin.
Choose the correct option given below :-

Study the following statements and choose the correct option :
(i) The placenta facilitates the supply of oxygen and nutrients to the embryo.
(ii) Hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL). estrogens, progesterone only secreted by pregnant female.
(iii) During pregnancy the levels of hormones like estrogens, progesterone, cortisol, prolactin, thyroxine, etc., are increased several folds in the maternal blood.
(iv) The signals for parturition originate only from the placenta which induce mild uterine contractions called foetal ejection reflex.
(v) Foetal ejection reflex triggers release of oxytocin from the maternal pituitary.

The osmoreceptors of body are activated by....

A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin.This is the result of

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by

Which of the following statement is incorrect regarding cuboidal epithelium?