Download App

Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYSexual Reproduction in Flowering Plants5 Marks
Question
  1. How is artificial hybridisation considered a crop improvement programme?
  2. Explain the process of artificial hybridisation, if
  1. Female parent bears bisexual flowers.
  2. Female parent bears unisexual flowers.
✓

Answer

  1. Artificial hybridisation involves crossing of different varieties or species or even different genera to combine the desirable characters of the two parents to produce a commercially superior variety.
  2.  
  1. When the female parent bears bisexual flowers:
  • Emasculation is necessary; it is the removal of anthers/ stamens before the pollen grains mature.
  • The emasculated flower is bagged to prevent contamination of the stigma with unwanted pollen grains.
  • When the stigma attains receptivity, the pollen grains collected from the selected male parent are dusted on the stigma.
  • The flower is rebagged and allowed for further development.
  1. When the female parent bears unisexual flowers:
  • There is no need for emasculation.
  • The female flower is bagged before the stigma becomes receptive.
  • When the stigma becomes receptive, the pollen grains collected from the selected male parent are dusted on the stigma.
  • The flower is rebagged and allowed for further development.

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 Sexual Reproduction in Flowering Plants→Sexual Reproduction in Flowering Plants — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Answer the following questions:
Explain the events that occur in a graafian follicle at the time of ovulation and thereafter.
→
Electrical and chemical synapses:
→
Write important features of a sedimentary cycle in an ecosystem.
→
Structure of sperm.
→
Homologous organs and Analogous organs.
→
Hormones are called chemical messengers and regulators. Explain.
→
During her tour to a renowned forest, Sakshi saw a highway being constructed, which passes through the middle of the forest. She was unhappy seeing that and on return, she contacted the local eco-club and approached the concerned department to stop the work.
  1. What would be the effect on biodiversity, if the highway is constructed?
  2. How forests are useful to mankind?
  3. What values of Sakshi reflect here?
→
What are the basic characteristics of a modern landfil site. List any three and also mention the reasons for their use.
→
Describe in brief an account of disorders of the thyroid.
OR
What are the functional disorders of thyroid gland? Describe in brief.
→
Discuss about experiment of Hendricks and Borthwick for discovery of phytochromes.
→