Which one of the following statements is correct for secondary succession?
1. | It occurs on a deforested site |
2. | It follows primary succession |
3. | It is similar to primary succession except that it has a relatively slow pace |
4. | All of the above |
1. egg
2. synergid
3. zygote
4. suspensor
Which one of the following pairs of gases are the cause of 'Greenhouse effect'?
1.
2.
3.
4.
1. | UNEP - United Nations Environmental Policy |
2. | EPA - Environmental Pollution Agency |
3. | IUCN -International Union for Conservation of Nature and Natural Resources |
4. | IPCC -International Panel for Climate Change |
1. | It shows the energy content of different trophic-level organisms |
2. | It is inverted in shape |
3. | It is upright in shape |
4. | Its base is broad |
Match the source gland with its respective hormone as well as the function.
Source gland |
Hormone | Function | |
(a) | Posterior pituitary |
Vasopressin | Stimulates reabsorption of water in the distal tubules in the nephron |
(b) | Corpus luteum |
Prolactin | Supports pregnancy |
(c) | Thyroid | Thyroxine | Regulates blood calcium level |
(d) | Anterior pituitary |
Oxytocin | Contraction of uterus muscles during childbirth |
1. (a)
2. (b)
3. (c)
4. (d)
1. Twelve weeks
2. Eighteen weeks
3. Six weeks
4. Eight weeks
1. | Insects | 2. | Birds |
3. | Angiosperms | 4. | Fungi |