Identify A to D in given diagrams showing asexual reproductive structure:
(1) A - Zoogamete, B - Bud, C - Conidia , D – Gemmule
(2) A - Zoospore, B - Conidia, C - Bud, D – Gemmule
(3) A- Zoospore, B - Conidiosporangium, C - Bud, D – Gemmule
(4) A - Aplanospore, B - Conidia, C - Bud, D - Gemmule
Examine the figures given below and select the right options out of (a - d); in which all the 4 items A, B, C and D are identified correctly:
|
A |
B |
C |
D |
1. |
Tuber |
Offset |
Sucker |
Leaf buds |
2. |
Offset |
Sucker |
Stolon |
Leaf buds |
3 |
Offset |
Sucker |
Stolon |
Leaf buds |
4. |
Tuber |
Rhizome |
Bulbil |
Leaf buds |
Which of the following statements is false?
(1) Asexual reproduction is simpler than sexual reproduction
(2) Asexual reproduction occurs by fission, budding and fragmentation
(3) In most of the animals both asexual and sexual modes of reproduction are found
(4) Vegetative and sexual modes of reproduction are exhibited by the higher plants
Which of the following is false about internal fertilization?
I. Male gamete is motile
II. Male gametes are non-motile
III. Male gametes are produced in large number
IV. Male gametes are produced in small number
V. There is a significant reduction in the number of eggs produce
VI. In seeded plants non-motile male gametes are carried to female gamete by pollen tubes
(1) I, III, V, VI
(2) III, IV
(3) II, IV
(4) V, VI
Select the-correct sequence from the following:
(1) Gametogenesis → Syngamy → Zygote → Embryogenesis
(2) Gametogenesis → Syngamy → Embryogenesis → Zygote
(3) Zygote → Embryogenesis → Gametogenesis
(4) Syngamy → Gametogenesis → Zygote → Embryogenesis
Select the correct sequence from the following:
I. Juvenile phase → Senescent phase → Reproductive phase
II. Juvenile phase → Reproductive phase → Senescent phase
III. Reproductive phase → Juvenile phase → Senescent phase
IV. Vegetative phase → Reproductive phase → Senescent phase
(1) I and II
(2) I and IV
(3) III and IV
(4) II and IV
I. Bamboo species flower only once in their life time, generally after 50 -100 years, produce large number of fruits and die
II. In animals the juvenile phase is followed by physiological changes prior to active reproductive behaviour.
III. The reproductive phase is of same duration in all organisms.
IV. Juvenile phase is the period of growth between the birth of an individual till it reaches reproductive maturity.
V. In plants juvenile phase is also called vegetative phase.
Which of the following statements is false?
(1) I
(2) II
(3) III
(4) V
Many mammals, especially in natural, wild conditions are:
(1) Continuous breeders
(2) Seasonal breeders
(3) Both continuous and seasonal breeders
(4) Very much disease sensitive
Which of the following regulates the reproductive processes and the associated behavioural expressions of organisms?
(1) Hormones
(2) Environmental factors
(3) Abiotic components
(4) Interaction between hormones and environmental factors
Meiosis:
(1) Does not take place in organisms showing asexual reproduction only
(2) Takes place in some sexually reproducing haploid organism
(3) Takes place in sexually reproducing diploid organism
(4) All of the above are correct