| (A) | removal of 80% of tigers from an area resulted in greatly increased growth of vegetation |
| (B) | removal of most of the carnivores resulted in an increased population of deer |
| (C) | the length of food chains is generally limited to 3-4 trophic levels due to energy |
| (D) | the length of food chains may vary from 2 to 8 trophic levels |
Which two of the above statements are correct?
1. B and C
2. C and D
3. A and D
4. A and B
| 1. | absence of true coelom but the presence of metamerism |
| 2. | presence of neither true coelom nor metamerism |
| 3. | presence of true coelom but the absence of metamerism |
| 4. | presence of true coelom and metamerism (metamerisation) |
Consider the following four statements (A-D) about certain desert animals such as kangaroo rats:
| A. | they have a dark colour and a high rate of reproduction and excrete solid urine. |
| B. | they do not drink water, breathe at a slow rate to conserve water, and have their body covered with thick hairs. |
| C. | they feed on dry seeds and do not require drinking water. |
| D. | they excrete very concentrated urine and do not use water to regulate body temperature. |
Which two of the above statements for such animals are true?
| 1. | C and D | 2. | B and C |
| 3. | C and A | 4. | A and B |
| 1. | They could separate combinations of molecules from the surroundings |
| 2. | They were able to reproduce |
| 3. | They were partially isolated from the surroundings |
| 4. | They could maintain an internal environment |
Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?
|
Animals |
Morphological feature |
|
(a) Liver fluke, sea anemone, sea cucumber |
Bilateral symmetry |
|
(b) Centipede, prawn, sea urchin |
Jointed appendages |
|
(c) Scorpion spider, cockroach |
Ventral solid central nervous system |
|
(d) cockroach locust, Taenia |
Metameric segmentation |
1. a
2. b
3. c
4. d
1. pomegranate
2. orange
3. guava
4. cucumber
1. CFCs 14%, CH4 20%
2. CO2 40%, CFCs 30%
3. N2O 6%, CO2 86%
4. CH4 20%, N2O 18%
| 1. | Brazil | 2. | Sweden |
| 3. | Argentina | 4. | South Africa |
1. temperate deciduous forests
2. alpine forests
3. scrub forests
4. tropical rain forests
Which one of the following is the true description of an animal concerned?
| 1. | Cockroach – 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen) |
| 2. | Earthworm – The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard, and intestine |
| 3. | Frog – Body divisible into three regions -head, neck, and trunk |
| 4. | Rat – Left kidney is slightly higher in position than the right one |
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