Which one of the following generates new genetic combinations leading to variation?
1. Vegetative reproduction
2. Parthenogenesis
3. Sexual reproduction
4. Nucellar polyembryony
Match Column I with column II and select the correct option using the codes given below:
Column I | Column II | ||
A. | Pistils fused together | 1. | Gametogenesis |
B. | Formation of gametes | 2. | Pistillate |
C. | Hyphae of higher ascomycetes | 3. | Syncarpous |
D. | Unisexual female flower | 4. | Dikaryotic |
1. A-4 B-3 C-2 D-1
2. A-2 B-1 C-4 D-3
3. A-1 B-2 C-4 D-3
4. A-3 B-1 C-4 D-2
Flowers are unisexual in?
1. Pea
2. Cucumber
3. China rose
4. Onion
Which of the following pairs is not correctly matched?
Mode of reproduction | Example | ||
(a) | Offset | (i) | Water hyacinth |
(b) | Rhizome | (ii) | Banana |
(c) | Binary fission | (iii) | Sargassum |
(d) | Conidia | (iv) | Penicilium |
1. a
2. b
3. c
4. d
In ginger vegetative propagation occurs through:
Product of sexual reproduction generally generates:
1. Prolonged dormancy
2. New genetic combination leading to variation
3. Large biomass
4. Longer viability of seeds
Offsets are produced by:
1. | Meiotic divisions |
2. | Mitotic divisions |
3. | Parthenocarpy |
4. | Parthenogenesis |
Which one of the following statements is not correct?
1. | Offspring produced by asexual reproduction is called clone |
2. | Microscopic motile asexual reproductive structures are called zoospores |
3. | In potatoes, bananas, and ginger, the plantlets arise from the internodes present in the modified stem |
4. | Water hyacinth growing in standing water drains oxygen from water that leads to the death of fish |
Select the correct sequence of events.
1. | Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis |
2. | Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division (Cleavage) → Organogenesis → Cell differentiation |
3. | Gametogenesis → Syngamy → Gamete transfer → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis |
4. | Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell differentiation → Cell division (Cleavage) → Organogenesis |