Advertisements
Advertisements
Question
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Advertisements
Solution
As a senior biology student, to demonstrate cross-pollination in a hermaphrodite flower, first perform emasculation by removing stamens before pollen release to prevent self-pollination. Next, bag the emasculated flower to avoid contamination from unwanted pollen. Then, collect pollen from a different plant and dust it onto the stigma of the emasculated flower. Finally, re-bag and label the flower to ensure controlled cross-pollination. This procedure prevents self-fertilisation and promotes genetic variation.
RELATED QUESTIONS
With the help of a suitable example, explain protandry.
Describe the characteristic features of wind pollinated flowers.
A flower of tomato plant following the process of sexual reproduction produces 200 viable seeds.
Answer the following questions giving reasons :
(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?
(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?
(c) How many pollen grains must have minimally pollinated the carple ?
(d) How many male gametes would have used to produce these 200 viable seeds ?
(e) How many megaspore mother cells were required in this process ?
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
Enlist advantages and disadvantages of cross pollination
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as ______.
Fill in the blanks with suitable words.
Different timings for the maturation of gynoecium and androecium is called ________.
Answer the following question.
Express the process of pollination in Vallisneria.
What are the adaptations which are required in self-pollinated plants?
The question has four options. Choose the correct answer:
Pollination by insect is known as
Very short answer type question:
What is hydrophily?
Autogamy can occur in a chasmogamous flower if ______.
Wind pollination is common in ______.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Even in absence of pollinating agents seed-setting is assured in ______.
Which of the following is not a water pollinated plant?
The flower which possesses both androecium and gynoecium is called perfect or ______.
Which one of the following may require pollinators, but is genetically similar to autogamy?
Choose the correct statement from the following:
What is hypohydrophily?
