Water hyacinth is one of the most invasive weeds primarily because:
1. It gets adapted to any fresh water body easily
2. It produces secondary metabolites against herbivores
3. It can propagate vegetatively at a phenomenal rate
4. It is predated upon by a large number of organisms
The number of chromosomes in a meiocyte of the fruit fly is:
(1) 4
(2) 8
(3) 12
(4) 16
With respect to organisms exhibiting internal fertilization, organisms exhibiting external fertilization show:
1. More variations
2. Great synchrony between sexes
3. Large female size than males
4. Less vulnerability to predation
What is true in the given figure?
1. The plant concerned is Chara and A is Oogonium and B is Antheridium
2. The plant concerned is Chara and B is Oogonium and A is Antheridium
3. The plant concerned is Marchantia and A is Oogonium and b is Antheridium
4. The plant concerned is Marchantia and B is Oogonium
Most vital event for sexual reproduction is
1. Gametogenesis
2. Fertilisation
3. Embryogenesis
4. Gamete transfer
Which of the following is not a post-fertilisation event in flowering plants?
(1) Zygote Zygospore
(2) Zygote Embryo
(3) Ovule Seed
(4) Nucellus Perisperm
Inter-flowering period is
A. Juvenile phase
B. Associated with monocarpic plants
C. Recovery phase
D. Phase between two flowering in carrot
1. A & B 2. B & C
3. C & D 4. ONLY C
Asexual reproduction is the:
(1) Rapid and complex mode of reproduction
(2) Rapid production of genetically variable populations
(3) Production of large number of individuals without alternation of generation
(4) Formation of genetically and morphologically similar individuals from a zygote
Select the correct statement:
(1) Life span is not necessarily correlated with the size
(2) The habitat of organism responsible for how it reproduces asexually but not sexually
(3) In binary fission, equal division of cytoplasm is followed by karyokinesis
(4) Only the sexual mode of reproduction is present in most of the animals
Which are the common features of all three plant parts shown in the figure?
a. Presence of adventitious buds
b. Presence of nodes & internodes
c. Presence of adventitious shoot
d. Presence of buds in form of eyes
1. Only A 2. Only B
3. A & C Both 4. A, B, C & D
Further development of zygote depends upon?
(1) Type of life cycle followed by organism
(2) Environment in which that zygote develops
(3) Behaviour of that organism
(4) Both 1 and 2
A: All organisms have to reach a certain stage of growth and maturity in their life, before they can reproduce sexually.
B: Male and female gametes must be physically brought together to facilitate syngamy :
1. A - correct B – incorrect
2. Both A and B are correct
3. Both A and B are incorrect
4. A - incorrect B - correct
The given vegetative propagule is
1. Bulb of onion
2. Rhizome of turmeric
3. Tuber of potato
4. Bulbil of Agave