Which hormones are produced by placenta? What is their significance?

1

---

What are the functions of placenta?

1

---

Explain notochord?

1

---

Explain gastrulation? What stage follows gastrulation?

1

---

Do mountains exist on moon? How were they formed?

871

---

Name the minerals that attract lightning?

847

---

You want to estimate the evaporation through lakes. How would you do it?

887

---

Explain the process of formation of sedimentary rocks?

848

---

What do you mean by loam soil?

878

---

How old is the earth? How has the earth evolved since formation? How do you calculate the age of earth?

828

---

How is the age of mountains calculated?

991

---

Throw some light on water temperature in oceans and its effect on marine life.

837

---

Explain the constitution of mantle?

854

---

Explain ablation.

841

---

How does a volcano erupt?

877

---