STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

From the seminiferous tubules the spermatozoa pass into

Main cause of population explosion in the world is

Against which of the following does interferon act

Choose correct option for given statements :
(i) The female external genitalia do not include hymen and clitoris.
(ii) Mons pubis is a cushion of fatty tissue covered by skin and pubic hair in male.
(iii) The labia minora are paired folds of tissue under the labia majora.
(iv) The opening of the vagina is completely covered by a membrane called hymen.
(v) The clitoris is a tiny finger-like structure which lies at the upper junction of the two labia minora above the urethral opening.
(vi) The hymen is often torn during the first coitus (intercourse).

Which of the following option regarding given statements is correct ?
(i) In fishes single circulation present.
(ii) In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills.
(iii) In amphibians and reptiles incomplete double circulation present.
(iv) In amphibians and reptiles, oxygenated blood and the deoxygenated blood get mixed up in the single ventricle which pumps out mixed blood.
(v) In birds and mammals two separate circulatory pathways are present in these organisms, hence, these animals have double circulation.
(vi) In heart of fish deoxygenated blood present.

Non-chordates have

Among the following characters, which one was not considered by Mendel in his experiments on pea ?

Blood is a special connective tissue consisting of a fluid matrix plasma and formed elements, which of the following statements regarding blood plasma is correct ?
(i) Plasma constituting nearly 55 percent of the blood.
(ii) 90-92 percent of plasma is water.
(iii) Proteins contribute 6-8 percent of it.
(iv) Plasma also contains small amounts of minerals like Na⁺, Ca⁺⁺, Mg⁺⁺, HCO₃- Cl-, etc.
(v) Glucose, amino acids, lipids, etc., are also present.
(vi) Factors for coagulation or clotting of blood are also present in the plasma in an active form.
(vii) Plasma with clotting factors is called serum.