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प्रश्न
Type of sexual reproduction is ______.
विकल्प
Fragmentation
Regeneration
Gamete formation
Budding
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उत्तर
Type of sexual reproduction is Gamete formation.
Explanation:
Sexual reproduction is always accomplished with the assistance of two germ cells. Those two germ cells are female gametes and male gametes. Meiosis is the process by which gametes are formed. The number of chromosomes is reduced to half during meiosis, resulting in the formation of haploid gametes.
Notes
Gamete formation is a process involved in sexual reproduction. It is not a type of sexual reproduction.
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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
In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially?
A student identified the various parts of an embryo of a gram seed and listed them as given below :
(I) Testa
(II) Plumule
(III) Radicle
(IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are :
(A) I, II, III
(B) II, III, IV
(C) III, IV, V
(D) II, IV, V
Sketch the reproductive parts of a flower.
Mature ovary forms the ______.
Name the part made up of the stigma, style and ovary.
Fill in the following blank with suitable word :
The ovule becomes a .......... after fertilisation.
Fill in the following blank with suitable word :
The female organ of reproduction in the flower is the...........
Fill in the following blank with suitable word :
The male organ of reproduction in the flower is the.......... .
Draw a neat sketch of the carpel of a flower. Mark in it stigma, style and ovary.
What is made in ovary of a flower?
Give some examples of different modes of fertilisation in nature?
What changes take place in the flower after fertilisation which lead to the formation of seeds and fruit?
Put a tick mark (✓) against the correct alternative in the following statement
Pollen is produced in the:
In the figure, the parts marked A, B and C are sequentially:
(A) Plumule, Radicle and Cotyledon
(B) Radicle, Plumule and Cotyledon
(C) Plumule, Cotyledon and Radicle
(D) Radicle, Cotyledon and Plumule
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.
Sketch the labelled diagram.
Flower with its sexual reproductive organs.
Draw a diagram of the longitudinal section of a flower and label the following parts.
What is meant by pollination?
Pollen grains are formed by _________ division in locules of anthers.
__________ is present in unisexual flower.
Calyx : Sepals : : Corolla : ________________
Pollen tube reaches the embryo sac via style.
Define.
Inflorescence
Give scientific reason.
Flower is a structural unit of sexual reproduction in plants.
Explain the sexual reproduction process in plants with a diagram.
In which of the following manner the arrangement of megaspores in a tetrad is observed in angiosperms?
Which of the following is the outermost protective layer of anther?
Identify the female gametophyte in angiosperms.
The flower of the Hibiscus plant is ______
Complete the table
| Carly x | ______ | ______ |
| ______ | petal | attract insects |
| Androecium | ______ | Male reproductive part |
| ______ | ______ | Female reproductive part. |
Which among the following statements are true for sexual reproduction in flowering plants?
- It requires two types of gametes
- Fertilisation is a compulsory event
- It always results in formation of zygote
- Offspring formed are clones
Draw the diagram of a flower and label the four whorls. Write the names of gamete producing organs in the flower.
The pollen tube usually enters the embryo sac ______.
Given below is a diagram of a germinating seed. Label the parts that:
- gives rise to future shoot.
- gives rise to future root system.
- stores food.
- Assertion: Primary endosperm nucleus is diploid.
- Reason: It is the product of double fertilisation.
