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प्रश्न
Pollen tube reaches the embryo sac via style.
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
A student while observing an embryo of a pea seed in the laboratory listed various parts of the embryo as given below:
Testa, Tegmen, Radicle, Plumule, Micropyle, Cotyledon.
On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the above list:
(a) Testa, Radicle, Cotyleddon
(b) Tegmen, Radicle, Micropyle
(c) Cotyledon, Plumule, Testa
(d) Radicle, Cotyledon, Plumule
A student has to perform the experiment "To identify the different parts of an embryo of a dicot seed." Select from the following an appropriate group of seeds:
(a) Pea, gram, wheat
(b) Red kidney bean, maize, gram
(c) Maize, wheat, red kidney bean
(d) Red kidney bean, pea, gram
How is the process of pollination different from fertilization?
The fusion of male and female gametes is termed as ______.
State the name of the functional unit concerned with sexual reproduction.
Fill in the following blank with suitable word :
Flowering plants reproduce by ...........method of reproduction.
Fill in the following blank with suitable word :
The female organ of reproduction in the flower is the...........
Explain the term 'fertilisation'.
What type of plants reproduce by sexual reproduction method?
Name the part of a seed which grows into root.
Name the part of a seed which grows into shoot.
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
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 correct sequence of reproductive stages occurring in flowering plants is ______
Put a tick mark (✓) against the correct alternative in the following statement
Reproductive whorls of a flower are:
What are the male and female gametes in a flowering plant?
Draw a labelled diagram of a bisexual flower.
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
Describe an activity to demonstrate phototropism.
Sketch the labelled diagram.
Flower with its sexual reproductive organs.
Fill in the blanks and rewrite the completed statements:
Lymph flows in _______________ direction.
Mention pollination types.
Find an odd one out.
Bisexual : Hibiscus : : Unisexual : ___________
Define.
Inflorescence
Match the following
| 1. | Petal | Opuntia |
| 2. | Fern | Chrysanthemum |
| 3. | Phylloclade | Attracts insect |
| 4. | Hooks | Spore |
| 5. | Sucker | Bignonia |
Write the events involved in the sexual reproduction of a flowering plant.
Discuss the first event and write the types.
Which of the following are the chemical components of the wall of pollen tube?
Flowers showing ornithophily show few characteristic like ______.
The seed that contains the future plant is called the ______
State the number of sets of chromosomes present in a zygote.
Double fertilization is essential for formation of ______.
Double fertilization means ______.
Sketch and label the essential and accessory whorls of flower.
What is the function of calyx?
Triple fusion involves ______.
In flowering plants, the pollen grains are transferred to stigma by pollination but the female germ cells are present in the ovary.
Explain with the help of a labelled diagram (only concerned parts), how the male germ cell reaches the ovary.
