Download App

Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYReproduction in Lower and Higher Animals5 Marks
Question
Zona pellucida and Corona radiata.
✓

Answer

Zona pellucidaCorona radiata
1. Zona pellucida is inner, thin and transparent layer surrounding the secondary oocyte.1. Corona radiata is the outer thick layer surrounding the secondary oocyte.
2. Zona pellucida is a non-cellular layer.2. Corona radiata is a cellular layer.
3. Zona pellucida is secreted by the ovum itself.3. Corona radiata is formed by follicular cells which are glued together by hyaluronic acid.
4. Zona pellucida is retained for more time after fertilization till the ovum gets implanted in the uterus.4. Corona radiata is retained till the ovum gets fertilized.
5. Zona pellucida is digested by zona lysine or acrosin at the time of fertilization.5. Corona radiata is digested by hyaluronidase enzyme at the time of fertilization.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following questions in detail." from Reproduction in Lower and Higher Animals→Reproduction in Lower and Higher Animals — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Explain in brief Darwinism and its five main postulates.
→
Answer the following questions:
Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females.
→
Samya visited a zoo with her mother, on watching the cheetah, she wondered how he uses his forelimbs for running. While the same forelimbs in bats are used for flying. She wanted to know more about it and so asked her mother (a biology teacher) about it. Her mother explained her how forelimbs are modified in different animal groups for different functions.
  1. What are such organs called?
  2. Give an example of such organs from the plant world.
  3. What led to the origin of such organs?
  4. What are the values shown by Samya?
→
Distinguish between: Eurythermal and stenothermal.
→
Ectomycorrhizae and Endomycorrhizae.
→
Distinguish between : Erythrocytes and Leucocytes.
→
Comment on deforestation status of the world and its major effects.
→
Advantages of Single Cell Protein.
→
In what way anaerobic sludge diagestion is important in sewage treatments?
→
Draw a neat labelled sketch of Graafian follicle.
→