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प्रश्न
Which are the components of pollination?
उत्तर
Pollination occurs with the help of abiotic agents like wind, water and biotic agents like insects and other animals.
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संबंधित प्रश्न
Complete the following table to get the differences between asexual and sexual reproduction:
| Characteristics | Asexual Reproduction | Sexual Reproduction |
| Number of parents involved | ........................... | .............................. |
| Type of cells involved | Somatic cells | Germ cells |
| Type of cell division | ............................ | Meiosis and mitosis |
What are the advantages of sexual reproduction over asexual reproduction?
Describe the process of fertilisation in human beings.
A zygote is formed as a result of fertilisation.
List any four steps involved in sexual reproduction .
What is the other name of sex cells?
Define sexual reproduction.
Name the organ which produces female sex cells.
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
Give reason for the following:
The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.
One of the following process does not lead to the formation of clones. This is :
(a) fission
(b) fertilisation
(c) fragmentation
(d) tissue culture
Put a tick mark (✓) against the correct alternative in the following statement:
Which one of the following represents the correct sequence in the life history of a butterfly ?
- Egg → Larva → Adult → Pupa
- Egg → Pupa → Adult → Larva
- Egg → Larva → Pupa → Adult
- Egg → Pupa → Larva → Adult
Distinguish between the following pair of terms:
Budding and Regeneration.
Define the term Puberty.
How does a single called fertilized egg grows into an adult human body?
Differentiate between the following:
Sperm and Ovum
Differentiate between the following:
External fertilisation and Internal fertilisation.
Define the term Adolescence.
Define the term Puberty.
Define the term Metamorphosis.
Mention the common method of reproduction in Amoeba.
Name the organ involved in the following:
Fertilisation of ovum by tile sperm.
Mention the changes which occur during adolescence in humans.
Sketch and label the diagram showing self- and cross-pollination.
Answer in one sentence.
Which glands contribute fluids to the semen?
Write an account of the seminal vesicle and bulbourethral gland in the male reproductive system.
Which of the following is the male accessory gland?
Sexual reproduction can be grouped into ______ distinct states.
Characters that are transmitted from parents to offspring during reproduction show ______
The zygote divides repeatedly into a group of cells, which develops into different tissues and organs constituting a full body. This structure is known as ______.
Animals in which an embryo develops outside the body are called ______ animals.
______ lay thousands and sometimes millions of small, soft eggs in water.
In ______ animals, the development of the embryo takes place inside the body.
In telolecithal egg, the yolk is found:
Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.
Differentiate between oestrus and menstrual cycles. Cite an example for each type.
