ZOOLOGY (2016 MARCH, +1)
ANSWERS
1. Ctenophora
2. Placoid scales
3. Salivary amylase
4. A-Goblet cell B- Exocrine gland
5. a) Mollusca
b) Cnidaria
c) Chordata – Aves
d) Hemichordata
6. A- carbonic
anhydrase
7. a) Primary metabolites &
secondary metabolites.
b) Primary metabolites: Amino acids, protein, carbohydrate etc.
Secondary metabolites: Alkaloids, terpenoids etc.
8. a) A. lens B. Iris C.
Cornea D. Optic nerve
b) Rods and Cones
9. a) Sliding filament theory.
b) Actin and Myosin
10. Museum
11. a) Chordata.
b) 1. Presence of
notochord.
2. Presence of pharyngeal gill slit.
3. Presence of post anal tail.
4. Presence of ventral
heart.
12. a) Yes.
b) ADH is produced by hypothalamus. It regulates the kidney
function by constricting blood vessels and helping in water reabsorption.
JGA is found in the distal convoluted tubule. A fall in GFR
activate the JG cells to release renin which stimulate the glomerular blood
flow.
ANF is found atrial wall of heart. It causes vasodilation
(dilation of blood vessels) and thereby decrease the blood pressure.
13. c- presence of different
types of teeth.
14. a) Oxygen dissociation curve
b) H+ concentration, temperature, CO2 andO2
15. Enzyme combines with
substrate and forms enzyme substrate complex.
Enzyme substrate complex dissociates and forms enzyme and
products.
16. a) insulin b) growth hormone
c) ADH d) thyroxine
OR
PTH increases Ca2+ level in blood
Calcitonin decreases Ca2+ level in blood
17. a) A. aorta B. Semilunar valve C. left ventricle
b)
OR
a) SA node initiates, regulate and maintains heart beat
b) Cardiac cycle: Sequence of events during the completion of one heart beat (systole and diastole)
Cardiac output: Volume of
blood pumped by each ventricle per minute.