One example of animals having a single opening to the outside that serves both as mouth as well as the anus is:
1. Octopus
2. Asterias
3. Ascidia
4. Fasciola
Select the correct statement from the ones given below:
| 1. | Barbiturates when given to criminals make them tell the truth |
| 2. | Morphine is often given to persons who have undergone surgery as a painkiller |
| 3. | Chewing tobacco lowers blood pressure and heart rate |
| 4. | Cocaine is given to patients after surgery as it stimulates recovery |
Listed below are four respiratory capacities (1-4) and four jumbled respiratory volumes of a normal human adult.
| Respiratory capacities | Respiratory volume | |
| (a) | Residual volume | 2500 mL |
| (b) | Vital capacity | 3500 mL |
| (c) | Inspiratory reserve volume | 1200 mL |
| (d) | Inspiratory capacity | 4500 mL |
Which one of the following is the correct matching of two capacities and volumes?
1. (a) 2500 mL, (d) 4500 mL
2. (c) 1200 mL, (a) 2500 mL
3. (b) 4500 mL, (c) 2500 mL
4. (d) 4500 mL, (b) 3500 mL
The chief water conducting elements of xylem in gymnosperms are:
1. vessels
2. fibres
3. transfusion tissue
4. tracheids
Membrane-bound organelles are absent in:
1. Saccharomyces
2. Streptococcus
3. Chlamydomonas
4. Plasmodium
Vasa efferentia are the ductules leading from:
1. Testicular lobules to rete testis
2. Rete testis to vas deferens
3. Vas deferens to epididymis
4. Epididymis to urethra
Select the correct statement from the following:
| 1. | Biogas is produced by the activity of aerobic bacteria on animal waste |
| 2. | Methanobacterium is an aerobic bacterium found in the rumen of cattle |
| 3. | Biogas, commonly called gobar gas, is pure methane |
| 4. | Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria |
Select the two correct statements out of the four (a-d) given below about lac operon:
| a: | Glucose or galactose may bind with the repressor and inactivate it. |
| b: | In the absence of lactose, the repressor binds with the operator region. |
| c: | The z-gene codes for permease. |
| d: | It was explained by Francois Jacob and Jacque Monod. |
The correct statements are:
| 1. | (b) and (c) |
| 2. | (a) and (c) |
| 3. | (b) and (d) |
| 4. | (a) and (b) |
© 2024 GoodEd Technologies Pvt. Ltd.