Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because
| 1. | Gibberellins prevent bolting and are inactivated. |
| 2. | Auxins prevent leaf drop at early stages. |
| 3. | Effect of auxins is removed and growth of lateral buds is enhanced. |
| 4. | Gibberellins delay senescence of leaves. |
In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed ?
| 1. | Ethylene | 2. | Auxins |
| 3. | Gibberellins | 4. | Cytokinins |
Match the items given in Column - I with those in Column - II and choose the correct option.
| Column-I | Column-II | ||
| (a) | Rennin | (i) | Vitamin B12 |
| (b) | Enterokinase | (ii) | Facilitated transport |
| (c) | Oxyntic cells | (iii) | Milk proteins |
| (d) | Fructose | (iv) | Trypsinogen |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (iv) | (ii) | (i) |
| 2. | (iv) | (iii) | (i) | (ii) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iii) | (iv) | (i) | (ii) |
Kwashiorkor disease is due to
1. simultaneous deficiency of proteins and fats
2. simultaneous deficiency of proteins and calories
3. deficiency of carbohydrates
4. protein deficiency not accompanied by calorie deficiency
Select the correct statement.
| 1. | Expiration occurs due to external intercostal muscles. |
| 2. | Intrapulmonary pressure is lower than the atmospheric pressure during inspiration. |
| 3. | Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure. |
| 4. | Expiration is initiated due to contraction of diaphragm. |
The maximum volume of air a person can breathe in after a forced expiration is known as :
| 1. | Expiratory Capacity |
| 2. | Vital Capacity |
| 3. | Inspiratory Capacity |
| 4. | Total Lung Capacity |
All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker ?
| 1. | SA node has the lowest rate of depolarisation |
| 2. | SA node is the only component to generate the threshold potential. |
| 3. | Only SA node can convey the action potential to the other |
| 4. | SA node has the highest rate of depolarisation. |
A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec.
This delay allows -
1. blood to enter aorta.
2. the ventricles to empty completely.
3. blood to enter pulmonary arteries.
4. the atria to empty completely.
Match the following parts of a nephron with their function:
| (a) | Descending limb of Henle's loop | (i) | Reabsorption of salts |
| (b) | Proximal convoluted tubule | (ii) | Reabsorption of water |
| (c) | Ascending limb of Henle's loop | (iii) | Conditional reabsorption of sodium ions and water |
| (d) | Distal convoluted tubule | (iv) | Reabsorption of ions, water and organic nutrients |
Select the correct option from the following:
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iii) | (ii) | (iv) |
| 2. | (ii) | (iv) | (i) | (iii) |
| 3. | (i) | (iv) | (ii) | (iii) |
| 4. | (iv) | (i) | (iii) | (ii) |
Match the items in Column-I with those in Column-II:
| Column-I | Column-II | ||
| (a) | Podocytes | (i) | Crystallised oxalate |
| (b) | Protonephridia | (ii) | Annelids |
| (c) | Nephridia | (iii) | Amphioxus |
| (d) | Renal calculi | (iv) | Filtration slits |
Select the correct option from the following:
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (iv) | (ii) | (i) |
| 2. | (iii) | (ii) | (iv) | (i) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iv) | (ii) | (iii) | (i) |
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