1. | the CO2 compensation point is more |
2. | CO2 generated during photorespiration is trapped and recycled through PEP carboxylase |
3. | The CO2 efflux is not prevented |
4. | They have more chloroplasts |
1. | cutting of DNA into fragments |
2. | separation of DNA fragments according to their size |
3. | construction of recombinant DNA by joining with cloning vectors |
4. | isolation of DNA molecule |
1. | several ribosomes attached to a single mRNA |
2. | many ribosomes attached to a strand of endoplasmic reticulum |
3. | a ribosome with several subunits |
4. | ribosomes attached in a linear arrangement |
Method |
Mode of action |
||
A. |
The pill |
1. |
Prevents sperms from reaching cervix |
B. |
Condom |
2. |
Prevents implantation |
C. |
Vasectomy |
3. |
Prevents ovulation |
D. |
Copper-T |
4. |
Semen contains no sperms |
1. A-3 B-1 C-4 D-2
2. A-4 B-1 C-2 D-3
3. A-3 B-4 C-1 D-2
4. A-2 B-3 C-1 D-4
1. | Inspiratory reserve volume plus tidal volume |
2. | Total lung capacity minus expiratory reserve volume |
3. | Inspiratory reserve volume plus expiratory reserve volume |
4. | Total lung capacity minus residual volume |
1. | Pteris | 2. | Funaria |
3. | Polytrichum | 4. | Cedrus |
1. | Flavr savr tomatoes |
2. | Starlink maize |
3. | Bt soybean |
4. | Golden rice |
A lake near a village suffered heavy mortality of fish within a few days. Consider the following reasons for this:
1. | Lots of urea and phosphate fertilizer were used in the crops in the vicinity. |
2. | The area was sprayed with DDT by an aircraft. |
3. | The lake water turned green and stinky |
4. | Phytoplankton populations in the lake declined initially, thereby, greatly reducing photosynthesis. |
Which two of the above were the main causes of fish mortality in the lake?
1. 2, 3
2. 3, 4
3. 1, 3
4. 1, 2