A ball rolling along the ground gradually slows down and finally comes to rest is due to ________.
1). Friction
2). Magnetic force
3). Electrostatic force
4). Muscular force
Animals belonging to phylum _____________ are fundamentally characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits.
1). Annelida
2). Chordata
3). Arthropoda
4). Platyhelminthes
Bryophytes are also called ____________ of the plant kingdom.
1). Mammals
2). Amphibians
3). Reptiles
4). Insecta
The__________ are the primary female sex organs that produce the female gamete (ovum) and several steroid hormones (ovarian hormones).
1). Cervix
2). Uterus
3). Ovaries
4). Clitoris
The innermost layer is the core with a radius of about ___________ km.
1). 500
2). 6500
3). 9500
4). 3500