2. Dogs give birth to puppies; cats
give birth to kittens. This process by
which animals produce other
animals of their kind is called
1. The contraction and relaxation of
muscles cause bone movement. A pair of
muscles works against each other. While
one contracts the other relaxes. What
happens to the muscles when it
A. It becomes long and thick.
B. It becomes short and thin.
C. It becomes long and thin.
D. It becomes short and thick.
3. It is a mechanical method of soil erosion
control. This is good on houses or roads by
the mountain side or hillsides. It also
prevent landslides. This process is
A. Strip cropping
D. Crop Rotation
5. Which of these situations shows storm signal
A. Classes in pre-school levels in all public and
private schools in affected communities are
B. Classes in preschool, elementary and high
school levels in all public and private schools in
the affected areas are automatically suspended
C. Classes in all levels are automatically
suspended in affected communities
D. Postponement of classes and work in
10. Man interferes with the balance
of nature when he _______.
A. pollutes air and water
B. disposes his garbage properly
C. practices selective logging
D. helps control overpopulation by
practicing family planning
1. Skeletal muscles are attached to
the bones by rubber-like cords
called tendons. Tendons are
stretched as the muscles and
bones move. What are the
tough fibers of proteins in
Write down your answer.