The chief water conducting elements of xylem in gymnosperms are:
1. vessels
2. fibres
3. transfusion tissue
4. tracheids
Ringworm in humans is caused by:
1. | bacteria | 2. | fungi |
3. | nematodes | 4. | viruses |
Which one of the following is not a micronutrient?
1. Molybdenum
2. Magnesium
3. Zinc
4. Boron
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) |
Keel is characteristic of the flowers of:
1. Gulmohur
2. Cassia
3. Calotropis
4. Bean
The kind of epithelium which forms the inner walls of blood vessels is:
1. cuboidal epithelium
2. columnar epithelium
3. ciliated columnar epithelium
4. squamous epithelium
Which one of the following has its own DNA?
1. Mitochondria
2. Dictyosome
3. Lysosome
4. Peroxisome