Advertisements
Advertisements
प्रश्न
Which of the following is the correct sequence of events of sexual reproduction in a flower?
विकल्प
pollination, fertilisation, seedling, embryo
seedling, embryo, fertilisation, pollination
pollination, fertilisation, embryo, seedling
embryo, seedling, pollination, fertilisation
उत्तर
pollination, fertilisation, embryo, seedling
Explanation -
During sexual reproduction, the first event that occurs is pollination, that is, transfer of pollen grains from the anther to the stigma. After pollination, pollen grain germinates on the stigma to form pollen tube which carries male gametes to the egg present inside the ovule for fertilisation. After fertilisation, a zygote is formed which develops into an embryo and ovule develops into a seed. On seed germination, embryo develops into a seedling under appropriate conditions.
APPEARS IN
संबंधित प्रश्न
Production of new individuals from the vegetative part of parent is called ______.
Describe the different methods of asexual reproduction. Give examples.
What would be the chromosome number of resulting cells when a microspore mother cell with 40 chromosomes undergoes meiosis?
In the following Question, the Assertion, and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following
Assertion: In human beings, the female. play a major role in determining the sex of the offspring.
Reason: Women have two X chromosomes.
Write two points of difference between asexual and sexual types of reproduction. Describe why variations are observed in the offspring formed by sexual reproduction.
Lila observed that a pond with clear water was covered up with a green alga within a week. By which method of reproduction did the algae spread so rapidly?
The ‘eye’ of the potato plant is what
Differentiate between binary fission in Amoeba and binary fission in Leishmania.
How does reproduction take place in malarial parasites?
| The most obvious outcome of the reproduction process is the generation of individuals of similar design, but in sexual reproduction they may not be exactly alike. The resemblances as well as differences are marked. The rules of heredity determine the process by which traits and characteristics are reliably inherited. Many experiments have been done to study the rules of inheritance. |
- Why an offspring of human being is not a true copy of his parents in sexual reproduction?
- While performing experiments on inheritance in plants, what is the difference between F1 and F2 generation?
- (A) Why do we say that variations are useful for the survival of a species over time?
OR
(B) Study Mendel's cross between two plants with a pair of contrasting characters.
RRYY × rryy Round Yellow Wrinkled Green He observed 4 types of combinations in F2 generation. Which of these were new combinations? Why do new features which are not present in the parents, appear in F2 generation?
