Advertisements
Advertisements
Question
Why does the zygote begin to divide only after the division of Primary endosperm cell (PEC)?
Advertisements
Solution
The zygote needs nourishment during its development. As the mature, fertilised embryo sac offers very little nourishment to the zygote, the PEC divides and generates the endosperm tissue which nourishes the zygote. Hence, the zygote always divides after division of PEC.
APPEARS IN
RELATED QUESTIONS
Describe the development of endosperm after double fertilisation in an angiosperm.
Draw a labelled mature stage of a dicotyledonous embryo.
Endosperm of angiosperm is __________.
(A) haploid
(B) diploid
(C) triploid
(D) tetraploid
Identify the CORRECT statement/s from the following.
i. In post-fertilization changes within the ovule, the development of embryo is followed by the development of endosperm.
ii. Helobial endosperm is intermediate between cellular and nuclear type endosperm.
iii. Helobial endosperm is mostly observed in 72 families of dicots.
Which of the following triggers an acrosomal reaction of the sperm?
At what stage of endosperm development, will you observe nuclear or cellular type of endosperm?
Ex-albuminous seeds differ from albuminous seeds in ____________.
A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be ______.
If an angiospermic male plant is diploid and female plant tetraploid, the ploidy level of endosperm will be ______.
The cells of endosperm have 24 chromosomes. What will be the number of chromosomes in the gametes?
Mark the odd one.
The type of evolution where the central part is occupied by free nuclear and the peripheral part by cells is observed in ______.
The diagram given below shows the three types of endosperms in angiosperms.
 |
 |
 |
| Type 1 | Type 2 | Type 3 |
- Identify the three types of endosperms shown above.
- Name the type of endosperm which commonly occurs in polypetalous dicots.
The number of chromosomes in the leaf cells of a male plant is 40 and in the stem cells of a female plant is 60. If they are artificially hybridised, what will be the number of chromosomes in the endosperm?
What is the ploidy level and functional role of endosperm formed after fertilisation in flowering plants?
During the process of nuclear type endosperm formation, what causes the free nuclei to be pushed to the periphery of the embryo sac?
Which of the following plants develops cellular type endosperm?
What is the developmental fate of the chalazal chamber in helobial type endosperm?
In a coconut, what do the coconut water and white kernel represent morphologically?
