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

1

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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?

837

---

Name the minerals that attract lightning?

814

---

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

837

---

Explain the process of formation of sedimentary rocks?

815

---

What do you mean by loam soil?

834

---

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

794

---

How is the age of mountains calculated?

938

---

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

787

---

Explain the constitution of mantle?

813

---

Explain ablation.

802

---

How does a volcano erupt?

831

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