Which one of the following is responsible for guttation?
1). Root pressure
2). Transpiration
3). Photosynthesis
4). Osmosis
In natural ecosystem, decomposers include
1). only microscopic animals
2). only bacteria and fungi
3). the above two types organisms plus microscopic animals
4). only the above two types of organisms
Among the following, which plant is completely devoid of roots?
1). Ceratophyllum
2). Hydrilla
3). Vallisneria
4). Azolla
The technique in which the developing embryo (at definite stage) from a pregnant superior breed is removed and transferred to another female with inferior characters, in whose body further development till birth takes place
1). Embryo transfer
2). Artificial insemination
3). Protoplast fusion
4). Cloning
External protective tissues of plants are
1). Cortex and epidermis
2). Pericycle and cortex
3). Epidermis and cork
4). Pericycle and cork