The quiescent centre in root meristem serves as a:
| 1. | site for storage of food, which is utilised during maturation |
| 2. | reservoir of growth hormones |
| 3. | reserve for replenishment of damaged cells of the meristem |
| 4. | region for absorption of water |
An example of competitive inhibition of an enzyme is the inhibition of:
1. succinic dehydrogenase by malonic acid
2. cytochrome oxidase by cyanide
3. hexokinase by glucose-6-phosphate
4. carbonic anhydrase by carbon dioxide
Biological Oxygen Demand (BOD) is a measure of:
| 1. | industrial wastes poured into water bodies |
| 2. | extent to which water is polluted with organic compound |
| 3. | amount of carbon monoxide inseparably combined with haemoglobin |
| 4. | amount of oxygen needed by green plants during night |
In prokaryotes, chromatophores are:
| 1. | specialised granules responsible for the colouration of cells |
| 2. | structures responsible for organising the shape of the organism |
| 3. | inclusion bodies lying free inside the cells for carrying out various metabolic activities |
| 4. | internal membrane systems that may become extensive and complex in photosynthetic bacteria |
The Montreal Protocol refers to:
1. persistent organic pollutants
2. global warming and climate change
3. substances that deplete the ozone layer
4. biosafety of genetically modified organisms
In the sieve elements, which one of the following is the most likely function of P-proteins?
1. Depletion of callose on sieve plates
2. Providing energy for active translocation
3. Autolytic enzymes
4. Sealing off mechanism on wounding
Which one of the following precedes re-formation of the nuclear envelope during the M-phase of the cell cycle?
| 1. | Decondensation from chromosome and reassembly of the nuclear lamina |
| 2. | Transcription from chromosome and reassembly of the nuclear lamina |
| 3. | Formation of the contractile ring and formation of the phragmoplast |
| 4. | Formation of the contractile ring and transcription from chromosomes |
Viruses that infect bacterial multiplication and cause their lysis, are called:
1. Lysosomes
2. lipolytic
3. lytic
4. lysogenic
A plant requires magnesium (Mg) for:
1. holding cells together
2. protein synthesis
3. chlorophyll synthesis
4. cell wall development
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