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प्रश्न
Give the importance of variation in survival of species.
Why is variation important for a species?
उत्तर
Importance of variation in survival of species:
- Variations result in variety and diversity.
- Due to adaptive variations, organisms are able to survive in changed environmental conditions.
- It prevents complete extinction of any species.
- Evolution continues through these variations and adaptations.
संबंधित प्रश्न
What is meant by sexual reproduction?
What are the advantages of sexual reproduction over asexual reproduction?
How does reproduction help in providing stability to populations of species?
Define Senescent phase.
What is amphimixis?
Differentiate between internal fertilization and external fertilization.
Complete the crossword puzzle using the hints given below.
Across
1. The process of the fusion of the gametes.
6. The type of fertilisation in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilised egg.
4. These animals lay eggs.
5. A type of fission in amoeba.
State the basic requirement for sexual reproduction?
List any four steps involved in sexual reproduction .
Differentiate between Parthenocarpy and Parthenogenesis. Give one example of each.
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
Define the term Implantation.
Define the term Puberty.
How does a single called fertilized egg grows into an adult human body?
Multiple choice question. Tick (✓) the correct choice:
Butterfly in its development from larva to an adult shows
- multiplication
- metamorphosis
- fertilisation
- none of the above
Multiple choice question. Tick (✓) the correct choice:
Which of the following glands is responsible for bringing about changes during adolescence in boys and girls?
- pituitary
- adrenal
- thyroid
- testis
Differentiate between the following:
External fertilisation and Internal fertilisation.
Define the term Puberty.
Mention the common method of reproduction in Hydra.
Mention the common method of reproduction in Flatworm.
Describe the various stages in the life cycle of a butterfly.
Explain the histological structure of testis.
Answer the following question.
Which is the function of male accessory glands?
Long answer question.
Describe female reproductive system of human.
Identify the labels from the given diagram.
Animals which give birth to young ones directly are named as ______.
Animals giving birth to young ones: ______
Match column -1 with column - II and select the correct option.
| Column - I | Column - II | ||
| 1. | Seminal vesicles | a. | Membranous urethra |
| 2. | Scrotum | b. | Thermoregulatory |
| 3. | Tunica vaginalis | c. | Fibro muscular pouches |
| 4. | Cowper's gland | d. | Peritoneal covering |
Choose the correct answer from the options given below:
Which of the following is a post-fertilization event in flowering plants?
- Eggs of both are formed only once in a lifetime
- Both the angiosperm egg and human egg are stationary
- Both the angiosperm egg and human egg are motile transported
- Syngamy in both results in the formation of zygote
Choose the correct answer from the options given below:
Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution.
- Lower groups of organisms have simpler body design
- Asexual reproduction is common in lower groups
- Asexual reproduction is common in higher groups of organisms
- The high incidence of sexual reproduction in angiosperms and vertebrates
Identify the incorrect statement.
Animals in which an embryo develops outside the body are called ______ animals.
______ lay thousands and sometimes millions of small, soft eggs in water.
What are oviparous animals?
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.
Explain how stability of the DNA of the species is ensured in sexually reproducing organisms.
