Biology 12 Chapter 21 Development and Aging - 25

Biology 12 Chapter 21
Development and Aging - 25

1. What could be the causes of secondary aging?

a) Malnutrition
b) Lack of exercise
c) All of them
d) Obesity

2. Which systems are affected during aging?

a) Circulatory
b) Nervous
c) All of them
d) Digestive

3. What changes occur at cellular level during aging?

a) Fragmentation of chromosomes occur
b) DNA damage repair system declines
c) Cells become larger
d) All of the above

4. How does a zygote differ from an ovum?

a) Zygote is smaller
b) Zygote is much larger
c) Zygote divides by meiosis
d) Zygote has more chromosomes

5. In human development, ectoderm cells migrate through the primitive streak to form………..?

a) Yolk sac
b) Chorion
c) Mesoderm
d) Endoderm

6. The process by which tissue causes another tissue to differentiate is called…………..?

a) Gastrulation
b) Metamorphosis
c) Induction
d) Cleavage

7. Which has three germ layers?

a) Embryonic disc
b) Trophoblast
c) Blastula
d) Gastrula

8. Which consists of both foetal and maternal tissue?

a) Umbilical cord
b) Placenta
c) Amnion
d) Allantois

9. Identical twins result from fertilization of…………..?

a) One ovum by two sperms
b) Two ovum by two sperms
c) Two ovum by one sperm
d) Ono ovum by one sperm

10. Which of the following are mismatched?a) Mesoderm; reproductive system
b) Ectoderm; circulatory system
c) Mesoderm; notochord
d) Endoderm; lining of the digestive tract

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