Question
Name the cell from which the endosperm develops in a coconut. Mention its ploidy. Explain the process of endosperm development in a coconut.

Answer

Endosperm develops from the primary endosperm cell. It is triploid (3n) in nature.
The endosperm develops from primary endosperm nucleus (PEN). The PEN undergoes successive nuclear divisions to give rise to free nuclei. This stage is called free nuclear endosperm. Subsequently, cell wall is formed on the periphery and endosperm becomes cellular.

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

How many primary follicles are left in each ovary in a human female at puberty?
Two parents Mr. X and Mrs. X and Mr. Y and Mrs. Y consider the same child as their respective children. Both Mr. and Mrs. A have blood group A, Mr. But the blood group of children is O. Tell whose child it could be and why?
A dihybrid heterozygous round, yellow seeded garden pea was crossed with a double recessive plant.
  1. What type of cross is this?
  2. Work out the genotype and phenotype of the progeny.
  3. What principle of Mendel is illustrated through the result of this cross?
Where does fertilisation normally take place in a human female?
How do biofertilisers enrich the fertility of the soil?
Study the given pedigree chart and answer the questions that follow:

  1. Is the trait recessive or dominant?
  2. Is the trait sex-linked or autosomal?
  3. Give the genotypes of the parents shown in generation I and of their third and fourth child in generation II.
  1. What is an ‘allergic reaction’?
  2. Name any two drugs used to quickly reduce the symptoms of allergy.
  3. Why do more and more children in metro cities of India suffer from allergies and asthma?
Name any three enzymes used in industry and explain their importance.
  1. What precaution(s) would you recommend to a patient requiring repeated blood transfusion?
  2. If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.
What is LAB? What is its role in human stomach?