CBSE Class 12 Biology Reproduction in Flowering Plants Cross Word

CBSE Class 12 Biology Reproduction in Flowering Plants Cross Word. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

CHAPTER 1 : REPRODUCTION IN ORGANISMS (CROSS WORD)

Across

1. ASEXUAL REPRODUCTIVE STRUCTURE OF PENICILLIUM [1 Mark]

Answer:
1. Conidia

Teacher's Note:
a) Conidia are non-motile asexual spores produced exogenously.
b) They are characteristic structures found in fungi like Penicillium.

4. SEXUAL REPRODUCING ORGANISM BEGINS ITS LIFE [1 Mark]

Answer:
1. Zygote

Teacher's Note:
a) The zygote is the vital link that ensures continuity of species between organisms of one generation and the next.
b) It is always a single-celled diploid structure formed by syngamy.

6. VEGETATIVE PROPAGULE OF AGAVE [1 Mark]

Answer:
1. Bulbils

Teacher's Note:
a) Bulbils are fleshy, modified floral buds that develop into new plants.
b) They detach and fall on the ground to grow.

9. VEGETATIVE PROPAGULE OF AGAVE [1 Mark]

Answer:
1. Bulbil

Teacher's Note:
a) This is the singular form referring to the same vegetative propagule of Agave.
b) It serves as an alternative mode of reproduction when floral parts are modified.

12. STAGE OF GROWTH AND MATURITY IN ANIMALS [1 Mark]

Answer:
1. Juvenile

Teacher's Note:
a) The juvenile phase is also known as the vegetative phase in plants.
b) It represents the period before an organism attains reproductive maturity.

13. FUSION OF GAMETES [1 Mark]

Answer:
1. Syngamy

Teacher's Note:
a) Syngamy results in the formation of a diploid zygote.
b) It is synonymous with fertilization in most sexual reproduction contexts.

16. BISEXUAL ANIMALS [1 Mark]

Answer:
1. Hermaphrodite

Teacher's Note:
a) Hermaphrodites possess both male and female reproductive organs.
b) Examples include earthworms, sponges, and tapeworms.

17. BIOLOGICAL PROCESS GIVING RISE TO YOUNG ONES [1 Mark]

Answer:
1. Reproduction

Teacher's Note:
a) Reproduction is a fundamental biological process enabling species to live generation after generation.
b) It can be broadly categorized into asexual and sexual types.

18. DENOTE BISEXUAL CONDITION [1 Mark]

Answer:
1. Homothallic

Teacher's Note:
a) The term homothallic is often used for fungi and plants to describe bisexual conditions.
b) Heterothallic refers to the unisexual condition.

21. MALE GAMETE [1 Mark]

Answer:
1. Antherozoid

Teacher's Note:
a) Antherozoids are motile male gametes produced in antheridia.
b) They require a medium like water to reach the female gamete in lower plants.

22. ASEXUAL REPRODUCTIVE STRUCTURE OF SPONGE [1 Mark]

Answer:
1. Gemmule

Teacher's Note:
a) Gemmules are internal buds formed by freshwater sponges during unfavorable conditions.
b) They are capable of withstanding harsh environmental conditions.

23. FUSION OF GAMETES OCCURE INSIDE THE BODY [1 Mark]

Answer:
1. Internal fertilization

Teacher's Note:
a) Internal fertilization protects the zygote from external environmental hazards.
b) It is observed in many terrestrial organisms including reptiles, birds, and mammals.

24. PERIOD FROM BIRTH TO NATURAL DEATH [1 Mark]

Answer:
1. Lifespan

Teacher's Note:
a) Lifespan is not necessarily correlated with the size of organisms.
b) Every organism has a specific pre-determined lifespan from birth to natural death.

Down

2. CYCLICAL CHANGES IN FEMALES OF NON-PRIMATE MAMMALS [1 Mark]

Answer:
1. Oestrus cycle

Teacher's Note:
a) Oestrus cycle occurs in non-primate mammals like cows, sheep, and dogs.
b) Primate mammals exhibit the menstrual cycle instead.

3. MICROSCOPIC MOTILE STRUCTURES [1 Mark]

Answer:
1. Zoospores

Teacher's Note:
a) Zoospores are flagellated, motile asexual reproductive structures.
b) They are commonly found in algae like Chlamydomonas.

5. GIVE BIRTH TO YOUNG ONES [1 Mark]

Answer:
1. Viviparous

Teacher's Note:
a) Viviparous animals give birth to live young after internal development.
b) The chances of survival of young ones are greater due to proper embryonic care.

7. CELLS UNDERGO MODIFICATION TO FORM SPECIALISED TISSUES [1 Mark]

Answer:
1. Differentiation

Teacher's Note:
a) Cell differentiation leads to the formation of specialized tissues and organs.
b) It occurs during embryogenesis and development.

8. PROTECTIVE THICK WALL OF THE FRUIT [1 Mark]

Answer:
1. Pericarp

Teacher's Note:
a) The pericarp develops from the wall of the ovary after fertilization.
b) It can be differentiated into epicarp, mesocarp, and endocarp.

10. OFFSPRINGS PRODUCED WITHOUT GAMETE FORMATION [1 Mark]

Answer:
1. Asexual

Teacher's Note:
a) Asexual reproduction does not involve fusion of gametes.
b) Resulting offspring are genetically identical to the parent.

11. PROCESS WHICH INVOLVES FUSION OF MALE AND FEMALE GAMETES [1 Mark]

Answer:
1. Sexual reproduction

Teacher's Note:
a) Sexual reproduction introduces genetic variation in the population.
b) It involves meiosis and syngamy.

14. PROCESS OF DEVELOPMENT OF EMBRYO [1 Mark]

Answer:
1. Embryogenesis

Teacher's Note:
a) Embryogenesis involves cell division and cell differentiation.
b) It transforms the zygote into a multicellular embryo.

15. CELL DIVIDES INTO TWO HALVES [1 Mark]

Answer:
1. Fission

Teacher's Note:
a) Binary fission is a common mode of asexual reproduction in single-celled organisms.
b) The parent cell divides into two equal halves, each forming a new individual.

18. GAMETE MOTHER CELL MALE GAMETE [1 Mark]

Answer:
1. Meiocyte

Teacher's Note:
a) A meiocyte is a diploid cell that undergoes meiosis to produce haploid gametes.
b) It has twice the number of chromosomes present in the gametes.

19. IDENTICAL INDIVIDUALS [1 Mark]

Answer:
1. Clone

Teacher's Note:
a) Clones are morphologically and genetically similar individuals.
b) They are formed through asexual reproduction without genetic recombination.

20. UNISEXUAL MALE FLOWER [1 Mark]

Answer:
1. Staminate

Teacher's Note:
a) A staminate flower bears only stamens, which are the male reproductive organs.
b) Conversely, pistillate flowers bear only female reproductive structures.