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प्रश्न
Collect five bisexual flowers from your neighborhood and with the help of your teacher find out their common and scientific names.
उत्तर १
Examples of plants bearing bisexual flowers are
(1) Water lily ( Nymphaea odorata)
(2) Rose (Rosa multiflora )
(3) Hibiscus (Hibiscus Rosa-sinensis )
(4) Mustard ( Brassica nigra)
(5) Petunia (Petunia hybrida)
उत्तर २
You can observe following bisexual flowers in your kitchen and colony gardens :
(1)Brassica (sarson) – Brassica campestris
(2)Onion – Allium cepa
(3)Garden Pea (Edible pea) – Pisum sativum
(4)Petunia – Petunia hybrida
(5)China rose (shoe flower) – Hibiscus rosa- sinensis
APPEARS IN
संबंधित प्रश्न
(a) Coconut palm is monoecious, while date palm is dioecious. Why are they so called?
A liverwort plant is unable to complete its life cycle in a dry environment. State two reasons
Explain why meiosis and gametogenesis are always interlinked?
Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n).
Ovary ———————————
Anther ———————————
Egg ———————————
Pollen ———————————
Male gamete ———————————
Zygote ———————————
State the fate of a pair of autosomes during gamete formation.
Mention the ploidy of the different types of cells present in the female gametophyte of an angiosperm.
Choose the correct statements.
Given below are a few statements related to external fertilization.
- The male and female gametes are formed and released simultaneously
- Only a few gametes are released into the medium
- Water is the medium in a majority of organisms exhibiting external fertilization
- Offspring formed as a result of external fertilization have better chance of survival than those formed inside an organism
Choose the statements that are true from the options below:
The statements given below describe certain features that are observed in the pistil of flowers.
- Pistil may have many carpels
- Each carpel may have more than one ovule
- Each carpel has only one ovule
- Pistil have only one carpel
In flowering plants both male and female gametes are non-motile. The method to bring them together for fertilization is ______.
Choose the correct statement from amongst the following.
Which of the following statements is true of date palm?
Meiosis is best observed in dividing ______.
Which plant will lose its economic value if its fruits are produced by induced parthenocarpy?
Pre-fertilization events include the following?
- Gametogenesis
- Zygotic embryogenesis
- Gamete transfer
- Homogametic union
- Heterogametic union
The correct combination is ______
Gamete transfer occurs through water in all of the following except:
The probability of fruit set in a self-pollinated bisexual flower of a plant is far greater than a dioecious plant. Explain.
Is the presence of large number of chromosomes in an organism a hindrance to sexual reproduction? Justify your answer by giving suitable reasons.
Which of the followings are monoecious and dioecious organisms?
| a. | Earthworm | ______ |
| b. | Chara | ______ |
| c. | Marchantia | ______ |
| d. | Cockroach | ______ |
In haploid organisms that undergo sexual reproduction, name the stage in the life cycle when meiosis occurs. Give reasons for your answer.
Do all the gametes formed from a parent organism have the same genetic composition (identical DNA copies of the parental genome)? Analyse the situation with the background of gametogenesis and provide or give suitable explanation.
