Advertisements
Advertisements
प्रश्न
In tobacco plant, the male gametes have 24 chromosomes.
What is the number of chromosomes in the zygote?
Advertisements
उत्तर
The zygote is formed by the fusion of a male and a female gamete. Therefore, the number of chromosomes in a zygote is twice as many as that of a gamete, i.e., 48.
APPEARS IN
संबंधित प्रश्न
Name and differentiate between the two modes of pollination in flowering plants.
You are asked by your teacher to study the different parts of an embryo of a gram seed. Given below are the steps to be followed for the experiment:
I. Soak the gram seeds in plain water and keep them overnight.
II. Cut open a soaked seed and observe its different parts.
III. Take some dry gram seeds in a petri dish.
IV. Drain the excess water.
V. Cover the soaked seeds with a wet cotton cloth and leave them for a day.
The correct sequence of these steps is :
(A) III, I, V, IV, II
(B) III, I, II, IV, V
(C) III, IV, V, I, II
(D) III, I, IV, V, II
The fusion of male and female gametes is termed as ______.
The reproductive part of a plant is the ______.
State the name of the functional unit concerned with sexual reproduction.
What is the function of a flower?
What is the name of female organ of a flower (other than carpel)?
Where is the female gamete formed in flowering plants?
Describe the process of fertilisation in a flower with the help of labelled diagrams.
The length of pollen tube depends on the distance between :
(a) pollen grain and upper surface of stigma
(b) pollen grain on upper surface of stigma and ovule
(c) pollen grain in anther and upper surface of stigma
(d) upper surface of stigma and lower part of style
In what ways is fertilisation in a plant different from fertilisation in a human?
Find the odd-one out, giving reason:
Anther, pollen grain, ovule male gamete
Differentiate between self-pollination and cross-pollination.
Find an odd one out.
Write the events involved in the sexual reproduction of a flowering plant.
a. Discuss the first event and write the types.
b. Mention the advantages and the disadvantages of that event.
The anther wall consists of four wall layers where ______
Antipodal cells are present towards the ______ in an anatropous ovule.
Which among the following statements are true for sexual reproduction in flowering plants?
- It requires two types of gametes
- Fertilisation is a compulsory event
- It always results in formation of zygote
- Offspring formed are clones
The figure below shows the concept of double fertilization. Complete the flow chart showing the progress at each step:
In male reproductive whorl of a flower the archesporial cells are formed by ______.
