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प्रश्न
Accessory whorls : Calyx and corolla : : essential whorls : ______________
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उत्तर
Accessory whorls : Calyx and corolla : : essential whorls : Androecium and gynoecium
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संबंधित प्रश्न
Match the following:
| Column A | Column B |
| (i) Stigma | (a) Neuron |
| (ii) Pepsin | (b) Carpel |
| (iii) Dendrites | (c) Protein |
| (d) Stamen |
Mention the changes a flower undergoes after fertilisation.
The reproductive part of a plant is the ______.
The process of fusion of the male and female gametes is called ______.
State the name of the functional unit concerned with sexual reproduction.
What is the name of female part of a flower?
Which of the following is the correct sequence of events of sexual reproduction in a flower?
(a) pollination, fertilisation, seed, embryo
(b) seed, embryo, fertilisation, pollination
(c) pollination, fertilisation, embryo, seed
(d) embryo, seed, pollination, fertilisation
Which of the following statements are true for flowers?
(i) Flowers are always bisexual.
(ii) They contain sexual reproductive organs.
(iii) They are produced in all groups of plants.
(iv) after fertilization they give rise to fruits.
The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.
(a) Name A. What are the various parts of A?
(b) Which part of A contains gametes?
(c) Name B. What is the swollen top of B known as?
(d) What does the swollen top of b contain?
(e) Out of A and B, which one is (i) male part, and (ii) female part of the flower?
| When an insect sits on the flower of a plant then somene particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of flower. The particle A grows a long tube B from the top of flask-shaped organ through which C moves down and reaches the bottom part of flask-shaped organ. Here C fuses with the nucleus of D contained in structure E. The fusion of C and D forms a new cell F which grows and develops into a seed of the plant. |
- What are particles A? What is the process of transferring A from one flower to another flower of similar plant by the insect known as?
- What is the name of tube B?
- What is C which moves down through the tube B?
- Name D and E.
- What is F?
In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.
What is a flower ? Draw a neat labelled diagram showing the L.S. of a typical flower.
Fill in the blanks:
A carpel consists of ________ , ________ and ________.
Fill in the blank:
Seeds are formed from________.
State whether the following statement is true (T) or false (F):
Stamens make egg cells.
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:
(a) Female germ cell
(b) Male germ cell
(c) Ovary
Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.
What is phototropism?
List any two differences between pollination and fertilization.
Identify the odd. Stigma, Style, Pollen, Ovary.
Draw a diagram of the longitudinal section of a flower and label the following parts.
__________ is present in unisexual flower.
Give scientific reason.
Fertilization in plants is called double fertilization.
The male reproductive part of a flower is ______.
Which of the following is the outermost protective layer of anther?
How many middle layers are generally present in the wall of the anther lobes?
The 3-celled egg apparatus at the micropylar end comprises of ______
Identify the female gametophyte in angiosperms.
What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?
Gloriosa superba exhibits ______.
In a flowering plant, archesporium gives rise to ______.
Where is the zygote located in the flower after fertilization?
The ovaries of different flowers may contain ______.
Give any two examples of agents of pollination.
The pollen tube usually enters the embryo sac ______.
