class 7 cbse science

The vascular tissue in plants is made of

• xylem

• phloem

• both xylem and phloem

• none of the above

The motion of the earth around the sun is due to

• magnetic force

• gravitational force

• electrostatic force

• none of the above

muscular force is exerted due to the

• elongation of muscles

• contraction of muscles

• both of the above

• none of the above

The partially digested food of ruminants is called

• rumen

• cud

• cellulose

• chyme

The temperature in a bee hive is high because

• bees have a secret heat source

• honeycombs are able to generate heat

• the activities of the bees makes the hive warmer

The stage in the production of silk in which the cocoons are kept in sun

• shearing

• winning

• rearing

• scouring

an organ system is a group of organs that act together to perfom a set of related functions.

• true

• false

The inner wall of small intestine bear numerous finger like projections called villi.

• true

• false

wool and silk can catch fire easily

• true

• false

pressure on solids increases with increase in surface area.

• true

• false