The highest number of species in the world is represented by:
1.
Fungi
2.
Mosses
3.
Algae
4.
Lichens
In which one of the following options the two examples are correctly matched with their particular type of immunity?
| Examples | Type of immunity |
|
| (a) | Polymorphonuclear leukocytes and monocytes | Cellular barriers |
| (b) | Anti-tetanus and anti-snake bite injection | Active immunity |
| (c) | Saliva in mouth and tears in eyes | Physical barriers |
| (d) | Mucus coating of the epithelium lining the urinogenital tract and HCl in the stomach | Physiological barriers |
2. (b)
3. (c)
4. (d)
Which one of the following is a wrong statement?
| 1. | Anabaena and Nostoc are capable of fixing nitrogen in a free-living state also |
| 2. | Root nodule-forming nitrogen fixers live as aerobes under free-living conditions |
| 3. | Phosphorus is a constituent of cell membranes, certain nucleic acids, and all proteins |
| 4. | Nitrosomonas and Nitrobacter are chemoautotrophs |
Anxiety and eating spicy food together in an otherwise normal human, may lead to:
1. Indigestion
2. Jaundice
3. Diarrhoea
4. vomiting
The Leydig cells as found in the human body are the secretory source of:
1. Progesterone
2. Intestinal mucus
3. Glocagon
4. Androgens
Compared to those of humans, the erythrocytes in frogs are:
| 1. | Without nucleus but with haemoglobin |
| 2. | Nucleated and with haemoglobin |
| 3. | Very much smaller and fewer |
| 4. | Nucleated and without haemoglobin |
In which one of the following, the genus name, its two characters and its phylum are not correctly matched, whereas the remaining three are correct?
| Genus Name | Two Characters | Phylum | ||
| 1. | Pila | (i) (ii) |
Body segmented Mouth with Radula |
Mollusca |
| 2. | Asterias | (i) (ii) |
Spiny skinned Water Vascular System |
Echinodermata |
| 3. | Sycon | (i) (ii) |
Pore bearing Canal system |
Porifera |
| 4. | Periplaneta | (i) (ii) |
Jointed appendages Chitinous exoskeleton |
Arthropoda |
What is true about ribosomes?
| 1. | The prokaryotic ribosomes are 80S, where S stands for sedimentation coefficient |
| 2. | These are composed of ribonucleic acid and proteins |
| 3. | These are found only in eukaryotic cells |
| 4. | These are self-splicing introns of some RNAs |
Cirrhosis of the liver is caused by the chronic intake of:
1. Opium
2. Alcohol
3. Tobacco (chewing)
4. Cocaine
Which one is a true statement regarding DNA polymerase used in PCR?
| 1. | It is used to ligate introduces DNA in recipient cells |
| 2. | It serves as a selectable marker |
| 3. | It is isolated from a virus |
| 4. | It remains active at high temperatures |
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