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प्रश्न
Pollen tube reaches the embryo sac via style.
विकल्प
True
False
उत्तर
True
APPEARS IN
संबंधित प्रश्न
A student was asked to observe and identify the various parts of an embryo of a red kidney bean seed. He identified the parts and listed them as under:
I. Tegmen
II. Testa
III. Cotyledon
IV. Radicle
V. Plumule
The correctly identified parts among these are
(A) I, II and III
(B) II, III and IV
(C) III, IV and V
(D) I, III, IV and V
(i) Name the part marked 'A' in the diagram.
(ii) How dose 'A' reachese part 'B'?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over?
"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.
Give one example of a unisexual flower.
Mention the changes a flower undergoes after fertilisation.
The reproductive part of a plant is the ______.
Name the male part of the flower.
What is the function of a flower?
How is the process of pollination different from fertilization?
What is seed? What are the parts of a seed? Explain with the help of a labelled diagram.
The correct sequence of reproductive stages occurring in flowering plants is ______
When an insect sits on the flower of a plant then some 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.
(a) 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?
(b) What is the name of tube B?
(c) What is C which moves down through the tube B?
(d) Name D and E.
(e) What is F?
In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.
In what ways is fertilisation in a plant different from fertilisation in a human?
Fill in the blank:
Seeds are formed from________.
Mention the function of Stigma.
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
Identify A, B, C and D in the given diagram and write their names.
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 fertilisation.
Identify the odd. Stigma, Style, Pollen, Ovary.
What is pollination? Mention its types.
What is cleistogamy? Write one advantage and one disadvantage of it, to the plant.
Find the odd one out:
Match the following
| 1. | Petal | Opuntia |
| 2. | Fern | Chrysanthemum |
| 3. | Phylloclade | Attracts insect |
| 4. | Hooks | Spore |
| 5. | Sucker | Bignonia |
In which of the following manner the arrangement of megaspores in a tetrad is observed in angiosperms?
Sperm and egg nuclei fuse due to ______.
Pineapple fruit develops from ______.
What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids?
Variations occur as a result of ______
Which out of the following processes does not lead to the formation of clones.
The ovaries of different flowers may contain
Sketch and label the essential and accessory whorls of flower.
Triple fusion involves ______.
Type of sexual reproduction is ______.
The pollen tube usually enters the embryo sac ______.
State the post-fertilisation changes that lead to fruit formation in plants.
