level: 2 marks
Questions and Answers List
level questions: 2 marks
| Question | Answer |
|---|---|
| Higher organism have resorted to sexual reproduction inspite of its complexity. Why? | Because of variations, gene pool, Vigour and Vitality and Parental care. |
| apeworms posses both male and female reproductive organs. What is the name given to such organism? Give two more examples of such organisms. | Hermaphrodite; Examples : Earthworm, Leech. |
| Study the relationship between first two words and suggest a suitable word for fourth place. (a) Male flower : Stamens :: Female Flower : ............................. (b) Birds : oviparous :: Primates : ............................. (c) Chlamydomonas : Zoospores :: Penicilium : ............................. (d) Ginger : Rhizome :: Agave : ............................. | (a) Carpel (b) Viviparous (c) Conidia (d) Bulbil |
| Bryophytes and Pteridophytes produce a large number of male gametes but relatively very few female gametes. Why? | Because male gemete need medium (water) to reach egg/female gamete.A large number of the male gametes fail to reach the female gamete. |
| Enlist the significance of reproduction. | Significance of reproduction includes: Propagation of species. Sustenance of life on this planet. Variation introduced during reproduction plays a role in evolution of new species. |
| Why do hilly areas of Kerela, Karnataka and Tamil Nadu transform into blue stretches that attracts many tourists? | Strobilanthus kunthiana which flowers only once in every 12 years flowered in 2006 that resulted into transformation of the hilly tracks of Kerela, Karnataka and Tamil Nadu into blue stretches |
| Define ‘oestrus’ and ‘menstrual’ cycles. | Non- Primates like cows, sheep etc. show certain cyclic changes during reproduction called oestrus cycle while Primates like apes, humans the cycle is referred to as menstrual cycle. |
| What regulates the reproduction processes and the associated behavioural expressions in organisms? | Interaction between hormones and certain environmental factors regulate the reproductive processes and the associated behavioural expressions of organisms. |
| Mention the different stages of sexual reproduction. | The different stages in sexual reproduction include: Pre- fertilization events. Fertilization. Post – fertilization events. |