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

During the course of development, cells in various regions of embryo become variable in morphology and eventually perform diverse functions. This process is known as

Which of the following statements are true about urine formation ?
(i) The tubular epithelial cells in different segments of nephron perform reabsorption either by active or passive mechanisms.
(ii) Substances like glucose, amino acids, Na+, etc., in the filtrate are reabsorbed passively.
(iii) Nitrogenous wastes are absorbed by active transport.
(iv) Reabsorption of water also occurs passively in the initial segments of the nephron.
(v) During urine formation, the tubular cells secrete substances like H⁺, K⁺ and ammonia into the filtrate.
(vi) Tubular secretion helps in the maintenance of ionic and acid base balance of body fluids.

Position of testis in Periplaneta americana

Histology of heart superficially shows the following structure except

Which one feature is common to leech, cockroach and scorpion

If a character is always transmitted directly from a father to all his sons and from their sons to all their sons, then which chromosome carries the gene for the character