STD 5 MOCK TEST

Air enters the tracheal system of insects through __________.

• Spiracles

• Lungs

• Gills

• Nostrils

The wings of bats are made up of ___________ stretched over long bones.

• Feathers

• skin

• scales

• hair

Why do herbivores have longer intestines?

• To digest flesh easily

• To store more food

• Because plant food takes more time to digest

• To help them run fast

A major benefit of root vegetative propagation is:

• Produces genetically identical plants

• Plants take a long time to flower

• Seeds are required

• Plants vary in traits

The main reason polar bears have white fur is to —

• look beautiful

• reflect sunlight

• camouflage in the snow

• attract other animals

The function of the cotyledons is to:

• Make food for the young plant

• Absorb water

• Grow roots

• Protect the seed coat

A flower that has both stamens and carpels is called:

• Unisexual flower

• Bisexual flower

• Male flower

• Female flower

A major advantage of artificial asexual reproduction is:

• Faster multiplication of plants

• Increased genetic variation

• Reduced fruit quality

• Dependence on natural pollinators

Plants grown from leaf cuttings are:

• Genetically different from the parent

• Genetically identical to the parent

• Always weaker than the parent

• Slower to grow than seeds

Which part of the plant is used in root vegetative propagation?

• Leaf

• Stem node

• Underground root or tuber

• Flower