2020 March (+1)
1. (c) Carbonic anhydrase
2. Amino acids
3. (b) Sarcomere
4. (b) Comb plates, Bioluminescence
5. (a) Taxon or (b) Species.
6. Amoeboid movement: E.g. Macrophages & leucocytes.
Ciliary movement: E.g. ciliary movements in trachea.
7. i. Uraemia
ii. Renal calculi
iii. Kidney transplantation
8. Class Amphibia: (i) & (iv)
Class Reptilia: (ii) & (iii)
9. Because enzyme molecules are fewer than the substrate molecules i.e. No free enzyme molecules to bind with additional substrate molecules.
10. Active transport: It is the transport against the concentration gradient.
Simple diffusion: It is the transport depending on concentration gradient.
11. (a) IRV: Additional volume of air a person can inspire by a forcible inspiration.
ERV: Additional volume of air a person can expire by a forcible expiration.
(b) Tidal Volume: Vole of air inspired or expired during normal respiration.
Residual volume: Volume of air remaining in the lungs after a forcible expiration.
12. (a) Gastric juice: Pepsin, Rennin, Lipase
Intestinal juice: Lipase
(b) Pepsin: Digests protein.
Lipase: Digests lipids.
13. A= Renin
B= Angiotensin I
D= Rise in GFR
14. Adrenal cortex: Secretes corticoid hormones for carbohydrate metabolism etc.
Adrenal medulla: Secretes adrenaline and noradrenaline (emergency hormones).
15. (a) Cockroach excretes uric acid.
(b) Malpighian tubules, Urecose glands etc.
· Cartilage cells are called chondrocytes.
· Intercalated discs are seen in cardiac muscle.
17. (a) ECG.
(b) P wave: Depolarization of atria.
QRS wave: Depolarization of ventricles.
T-wave: Repolarization of ventricles.
18. (A) Testis
(C) Provides immunity.
(F) Diurnal rhythm.
19. (a) A= Balanoglossus, B= Neries, C= Liver fluke (Fasciola).
(b) A= Hemichordata, B= Annelida, C= Platyhelminthes.
20. (a) A= Lens, B= Optic nerve
(b) Macula lutea (yellow spot)- thinned out part of retina.
(c) Cornea → Aqueous chamber → Lens → Vitreous chamber → Retina.