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

Choanocytes perform

A bird excretes nitrogenous waste materials in the form of

Mark the given statements True (T) or False (F) :
(i) Blood is a special connective tissues consisting of a fluid matrix, plasma, and formed elements.
(ii) Plasma is a straw colourless, viscous fluid constituting nearly 55% of the blood.
(iii) 90-95% of plasma is water and proteins contribute 5-10% of it.
(iv) Fibrinogen, globulins and albumins are the major proteins in plasma.
(v) Fibrinogen protein in plasma are needed for clotting, globulins for defense mechanism of body and albumins helps in osmotic balance.
(vi) Formed elements constitute nearly 55% of the blood.
(vii) A healthy adult man has on an average 5-5.5 millions of RBCs mm³⁺ of blood. In mammals RBC are devoid of nucleus and are biconcave in shape.
(viii) A healthy individual has 12-16 gms of Hb in every 100ml of blood. RBCs have an average life span of 120 days after which they are destroyed in the spleen.
(ix) Plasma with clotting factors is called serum.
(x) The number of WBCs in adult man is 6000-8000 mm^-3 of blood. The two main categories of WBCs are granulocytes and agranulocytes.
(xi) Neutrophils, eosinophils and basophils are different types of agranulocytes WBCs while lymphocytes and monocytes are the granulocytes.
Choose the correct option given below :-

In human female the blastocyst

Which of the following is considered as a recessive character of Mendel

How many eggs are laid by a female frog at a time

Which of the following are correct ?
(i) The urethra originates from the urinary bladder and extends through the penis to its external opening called urethral meatus.
(ii) Glanspenis is covered by a loose fold of skin called foreskin.
(iii) The male accessory glands include paired seminal vesicles, a prostate and paired bulbourethral glands.
(iv) Secretions of male accessory glands constitute the seminal plasma which is rich in fructose, calcium and certain enzymes.

Statement I: Hypothalamus is located in a bony cavity called sella tursica.
Statement II: The posterior pituitary is under the direct neural regulation of the hypothalamus.