STD 12 - 7. human health and disease — NEET STD 11 Science — Question

Match the following

Column-l	Column-II
A. 2,4-D	i. Herring sperm DNA
B. ABA	ii. Bolting
C. Ethylene	iii. Stomatal closure
D. GA	iv. Weed-free lawns
E. Cytokinins	v. Ripening of fruits

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.

The active form of Entamoeba histolytica feeds upon

A bacterial cell was transformed with a recombinant DNA that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reasons could be:

Three of the following pairs of the human skeletal parts are correctly matched with their respective inclusive skeletal category and one pair is not matched. Identify the non­matching pair.

Assertion: Ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump.
Reason: Sodium -potassium pump transports 3 Na⁺ outwards for 2 K⁺ into the cell.

Signals for parturition originate from

Dendrites transmit impulses towards the

Resorption of water and electrolytes by distal tubules of kidney and thereby diuresis reducing the loss of water through urine (diuresis) done by

The flowering plants originated in which of the following periods?