Question
Study the following flow chart. Name the hormones involved at each stage. Explain their functions.
✓
Answer
| Hypothalamus |
| $\downarrow$ |
| Pituitary |
| $\downarrow$ |
| Testes |
| $\downarrow$ |
| Sperms |
- Hypothalamus secretes gonadotropin-releasing hormone (GnRH), which stimulates the anterior pituitary gland to secrete gonadotropins like luteinizing hormone (LH) and follicle stimulating hormone (FSH).
- LH stimulates the Leydig cells of testes to secrete androgens (like testosterone), which control spermatogenesis.
- FSH acts on Sertoli cells of testes, which in response secrete certain factors necessary for spermiogenesis; the sperm heads become embedded in the sertoli cells.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Study the illustration given and answer the questions that follow:
In the case of snapdragon (Antirrhinum majus) a plant with red flowers was crossed with another plant with white flowers. Trace the inheritance of flower colour up to F2 generation indicating the genotype and phenotype at each level. What special feature do you notice in the genotype and phenotype ratio in F2 generation?
The graph given below shows the variation in the levels of ovarian hormones during various phases of menstrual cycle:
What is menstrual cycle. Explain its various events with the help of diagram.###Describe in detail the various stages of menstrual cycle with the help of diagram.###Write a detail note on different stages of menstrual cycle and also sketch out these stages of
menstrual cycle by graphical diagram.###Define sexual reproduction. Explain the process of menstrual cycle.
menstrual cycle by graphical diagram.###Define sexual reproduction. Explain the process of menstrual cycle.
List the attributes that populations but not individuals possess.
An individual and a population has certain characteristics. Name these attributes with definitions.
Answer the following questions:
Draw a labelled diagram of a human ovum released after ovulation.
Draw a labelled diagram of a human ovum released after ovulation.
We are told that evolution is a continuing phenomenon for all living things. Are humans also evolving? Justify your answer.
- What is an ecological pyramid? Compare the pyramids of energy, biomass and numbers.
- Write any two limitations of ecological pyramids.
Describe in detail that formation of life was preceded by chemical evolution.
OR
Write an essay on Oparin theory of origin of life.
OR
Write an essay on Oparin theory of origin of life.