A nitrogen-fixing microbe associated with Azolla in rice fields is:
1. Spirulina
2. Anabaena
3. Frankia
4. Tolypothrix
Select the correct statement regarding the specific disorder of muscular or skeletal system.
| 1. | Muscular dystrophy - age-related shortening of muscles |
| 2. | Osteoporosis- decrease in bone mass and higher chances of fractures with advancing age |
| 3. | Myasthenia gravis- an autoimmune disorder which inhibits the sliding of myosin filaments |
| 4. | Gout- inflammation of joints due to extra deposition of calcium |
Water containing cavities in vascular bundles are found in:
1. Sunflower
2. Maize
3. Cycas
4. Pinus
Select the correct statement from the following regarding cell membrane:
| 1. | Na+ and K+ ions move across cell membranes by passive transport |
| 2. | Proteins make up 60% to 70% of the cell membrane |
| 3. | Lipids are arranged in a bilayer with polar heads towards the inner part |
| 4. | Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson |
Gymnosperms are also called softwood spermatophytes because they lack:
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
The coconut water and the edible part of coconut are equivalent to:
1. Endosperm
2. Endocarp
3. Mesocarp
4. Embryo
Vexillary aestivation is characteristic of the family:
1. Fabaceae
2. Asteraceae
3. Solanaceae
4. Brassicaceae
Which one of the following is an example of carrying out biological control of pests/diseases using microbes?
1. Trichoderma sp. against certain plant pathogens
2. Nucleopolyhedrovirus against white rust in Brassica
3. Bt-cotton to increase cotton yield
4. Ladybird beetle against aphids in mustard
Select the correct statement from the ones given below with respect to Periplaneta americana.
| 1. | Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives |
| 2. | Males bear a pair of short thread-like anal styles |
| 3. | There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut |
| 4. | Grinding of food is carried out only by the mouth parts |
© 2026 GoodEd Technologies Pvt. Ltd.