The primary producers of the deep-sea hydrothermal vent ecosystem are:
1. green algae
2. chemosynthetic bacteria
3. blue-green algae
4. coral reefs
Which of the following is correct for r-selected species?
1. Large number of progeny with small size
2. Large number of progeny with large size
3. Small number of progeny with small size
4. Small number of progeny with large size
If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to:
| 1. | mutualism | 2. | amensalism |
| 3. | commensalism | 4. | parasitism |
Which of the following is correctly matched?
| Column-I | Column-II | |
| 1. | aerenchyma | opuntia |
| 2. | age pyramid | biome |
| 3. | parthenium hysterophorus | threat to biodiversity |
| 4. | stratification | population |
Red List contains data or information on?
| 1. | all economically important plants |
| 2. | plants whose products are in international trade |
| 3. | threatened species |
| 4. | marine vertebrates only |
Which of the following sets of diseases is caused by bacteria?
1. Cholera and tetanus
2. Typhoid and smallpox
3. Tetanus and mumps
4. Herpes and influenza
| Column-I | Column-II | ||
| A. | Family | (i) | Diptera |
| B. | Order | (ii) | Arthropoda |
| C. | Class | (iii) | Muscidae |
| D. | Phylum | (iv) | Insecta |
| 1. | A-(iii) B-(i) C-(iv) D-(ii) |
| 2. | A-(iii) B-(ii) C-(iv) D-(i) |
| 3. | A-(iv) B-(iii) C-(ii) D-(i) |
| 4. | A-(iv) B-(ii) C-(i) D-(iii) |
Choose the correct statement.
| 1. | All mammals are viviparous |
| 2. | All cyclostomes do not possess jaws and paired fins |
| 3. | All reptiles have a three-chambered heart |
| 4. | All Pisces have gills covered by an operculum |
Study the four statements (I-IV) given below and select the two correct ones out of them:
| 1. | Definition of biological species was given by Ernst Mayr. |
| 2. | Photoperiod does not affect reproduction in plants. |
| 3. | Binomial nomenclature system was given by RH Whittaker. |
| 4. | In unicellular organisms, reproduction is synonymous with growth. |
The two correct statements are:
1. II and I
2. III and IV
3. I and IV
4. I and II
In male cockroaches, sperms are stored in which part of the reproductive system?
1. Seminal vesicles
2. Mushroom glands
3. Testes
4. Vas deferens
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