Question
Describe the process of microsporogenesis.

Answer

→As the anther develops, the cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads. The ploidy of the cells of the tetrad is haploid
→As each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad. Each one is a potential pollen or microspore mother cell.
→The process of formation of microspores from a pollen mother cell (PMC) through meiosis is called microsporogenesis.
→The microspores, as they are formed, are arranged in a cluster of four cells-the microspore tetrad.
→As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains.
→Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.
Image

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

Similar questions


  1. Identify the polarity from a to a', in the above diagram and mention how many more amino acids are expected to be added to this polypeptide chain.
  2. Mention the DNA sequence coding for serine and the anticodon of tRNA for the same amino acid.
  3. Why are some untranslated sequence of bases seen in mRNA coding for a polypeptide? Where exactly are they present on mRNA?
Answer the following questions with reference to opioids, the commonly abused drug :
a. Where in our body are the specific opioid receptors present?
b. What is heroin chemically known as?
c. Write the scientific name of the plant from which opioids are extracted.
List any three important characteristics of a population and explain.
What measure would you take to prevent water-borne diseases?
Explain the evolutionary theory of living form based on the observations of Charles Darwin.
Define pollination. Explain any two contrivances of self-pollination.
How is diapause different from hibernation?
A team of students are preparing to participate in the interschool sports meet. During a practice session you find some vials with labels of certain cannabinoids.
  1. Will you report to the authorities? Why?
  2. Name a plant from which such chemicals are obtained.
  3. Write the effect of these chemicals on human body.
How are baculoviruses and Bacillus thuringiensis used as biocontrol agents? Why are they preferred over readily available chemical pesticides?
Which property of DNA double helix led Watson and Crick to hypothesise semi-conservative mode of DNA replication? Explain.