In human body, which one of the following is anatomically correct?
1. Floating ribs-2 pairs 2. Collar bones-3 pairs 3. Salivary glands-1 pair 4. Cranial nerves-10 pairs
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
1. Casuarina equisetifolia
2. Crotolaria juncea
3. Cycas revoluta
4. Cicer arietinum
The population of an insect species shows an explosive increase in numbers during the rainy season followed by its disappearance at the end of the season. What does this show?
| 1. | S-shaped or sigmoid growth of this insect |
| 2. | the food plants mature and die at the end of the rainy season |
| 3. | Its population growth curve is of J-type |
| 4. | The population of its predators increases enormously |
One of the endangered species of Indian medicine plants is:
1. Podophyllum
2. Ocimum
3. Garlic
4. Nepenthes
In hexaploid wheat, the haploid (n) ar basic (x) numbers of chromosomes are:
1. n=7 and x=21
2. n=21 and x=21
3. n=21 and x=14
4. n=21 and x=7
In the cloning of cattle, a fertilized egg is taken out of the mother's womb and:
| 1. | the egg is divided into 4 pairs of cells which are implanted into the womb of other cows |
| 2. | in the eight-cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows |
| 3. | in the eight-cell stage, the individual cells are separated under an electrical field for further development in cultural media |
| 4. | from this, up to eight identical twins can be produced |
Which one of the following statements is correct?
| 1. | Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies |
| 2. | Both Azotobacter and Rhizobium in root nodules of plants |
| 3. | Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in the soil |
| 4. | At present it is not possible to grow maize without chemical fertilizers |
One of the important consequences of geographical isolation is:
1. no change in the isolated fauna
2. preventing speciation
3. speciation through reproductive isolation
4. random creation of new species
Flagellated male gametes are present in all three of which one of the following sets?
1. Anthoceros, Funaria, and Spirogyra
2. Zygnema, Saprolegnia, and Hydrilla
3. Fucus, Marsilea, and Calotropis
4. Riccia, Dryopteris, and Cycas
Molecular basis of organ differentiation depends on the modulation in transcription by:
1. RNA polymerase
2. ribosome
3. transcription factor
4. anticodon
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