Macro molecule chitin is:
1. Phosphorus containing saccharide
2. Sulphur containing polysaccharide
3. Simple polysaccharide
4. Nitrogen-containing polysaccharide
The H-zone in the skeletal muscle fibre is due to:
| 1. | The central gap between myosin filaments in the A-band. |
| 2. | The central gap between actin filaments extends through myosin filaments in the A-band. |
| 3. | Extension of myosin filaments in the central portion of the A-band |
| 4. | The absence of myofibrils in the central portion of the A-band. |
A diagram showing the axon terminal and synapse is given. Identify correctly at least two of A-D:
1. B- Synaptic connection; D- K+
2. A- Neurotransmitter; B- Synaptic cleft
3. C- Neurotransmitter; D- Ca++
4. A- Receptor; C- Synaptic vesicles
Which one of the following is not a correct statement?
| 1. | Botanical Gardens have a collection of living plants for reference. |
| 2. | A museum has a collection of photographs of plants and animals |
| 3. | The key is taxonomic aid for the identification of specimens. |
| 4. | herbarium houses dried, pressed and preserved plant specimens |
Global warming can be controlled by:
| 1. | Reducing reforestation, increasing the use of fossil fuel. |
| 2. | Increasing deforestation, slowing down the growth of the human population |
| 3. | Increasing deforestation, reduces the efficiency of energy usage. |
| 4. | Reducing deforestation, cutting down the use of fossil fuel. |
The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products.
Arrows numbered 4, 8, and 12 can all be:
| 1. | ATP | 2. | A2O |
| 3. | FAD+ or FADH2 | 4. | NADH |
Artificial insemination means:
| 1. | Transfer of sperm of husband to a test tube containing ova. |
| 2. | Artificial introduction of sperm of a healthy donor into the vagina. |
| 3. | Introduction of sperm of a healthy donor directly into the ovary. |
| 4. | Transfer of sperm of a healthy donor to a test tube containing ova. |
One of the representatives of the phylum Arthropoda is:
1. Silverfish
2. Pufferfish
3. Flying fish
4. Cuttlefish
Figure shows a human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/or functions.
| 1. | B-pelvis - broad funnel-shaped space inner to the hilum, directly connected to loops of Henle. |
| 2. | C- Medulla- inner zone of kidney and contains complex nephrons. |
| 3. | D- Cortex- outer part of the kidney and does not contain any part of nephrons. |
| 4. | A- Adrenal gland- located superior of the kidney; secretes catecholamines which stimulate glycogen breakdown. |
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