Download App

Enhancement of Food Production — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYEnhancement of Food Production5 Marks
Question
Describe the process of cocoon formation.
✓

Answer

  1. The eggs of silkworm hatch into larvae.
  2. The larvae develop into a caterpillar.
  3. Caterpillar feeds on fresh mulberry leaves.
  4. After its growth and moulting, the silkworm secretes a silk fibre to form cocoon.
  5. The silk is a continuous filament comprising fibroin protein, secreted from salivary glands of silkworm and a gum called sericin, which cements the filaments.
  6. The silk solidifies when it contacts the air.
  7. The silkworm spins approximately one mile of filament and completely encloses itself in a cocoon in about two or three days.

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 Enhancement of Food Production→Enhancement of Food Production — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

What is rDNA? Explain the technique of cloning rDNA.
→
Define and explain the terms Bioethics.
→
Your school has been selected by the Department of Education to organise and host an interschool seminar on "Reproductive Health - Problems and Practices". However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is "too embarrassing."
Put forth four arguments with appropriate reasons and explanation to justify the topic to be very essential and timely.
→
  1. How is mature insulin different from proinsulin secreted by pancreas in humans?
  2. Explain how was human functional insulin produced using rDNA technology.
  3. Why is the functional insulin thus produced considered better than the ones used earlier by diabetic patients?
→
Does apiculture offer multiple advantages to farmers? List its advantages if it is located near a place of commercial flower cultivation.
→
Stabilizing selection/Balancing selection.
→
Complete the following table by placing the categories and the given signs + : Benefited ; – : Inhibited ; 0 : Not affected
InteractionsSpecies
AB
1. Neutralism – …………………..  
2. Negative interactions …………………………  
3. Positive interactions …………………….  
4. Both positive and negative interactions ………………………….. 
→
Answer the following questions:
Name the stages in a human female where:
  1. Corpus luteum and placenta co–exist.
  2. Corpus luteum temporarily ceases to exist.
→
What could be the connecting points between the GFC and DFC?
→
  1. With labelled diagrams, depict the stages in embryo development in a dicotyledonous plant.
  2. Endosperm development precedes embryo development. Why?
→