Sexual reproduction in different animals involves formation of gametes by 

1. Same individual if hermaphrodite

2. By different individuals of the opposite sex 

3. Female only 

4. Both (1) & (2) 

An aquatic plant which is commonly known as "Terror of Bengal",can propagate vegetative by __________and its also called ___________

1. Offsets, Water hyacinth

2. Offsets, Water lettuce 

3. Turions, Water lily

4. Bulbils, Potamogeton

In the life span of which group of plants, vegetative, reproductive and senescent are clearly distinct?

1. Annual plants

2. Biennial plants

3. Perennial plants

4. More than option is correct

Juvenile phase or vegetative phase is related with all, except

1. It is pre-reproductive phase in the life cycle of an individual

2. It is the period of growth

3. It is of different durations in different organisms

4. It involves the appearance of flowers in higher plants

Zoospore is

1. Formed by the fusion of two gametes

2. Flagellated and motile structure

3. The net result of sexual reproduction

4. Always diploid

Water hyacinth is also known as 'terror of Bengal' because it

1. Releases saxitoxin

2. Drains $O_2$ from the running water

3. Leads to death of fishes

4. Is one of the most invasive crop

All organisms have to reach a certain stage of growth and maturity in their life, before they can reproduce sexually. That period of growth

1. Is called the juvenile phase, not vegetative phase

2. Is called the vegetative phase, not the juvenile phase

3. While ends then marks the beginning of the reproductive phase

4. Is variable in the same organisms

Mark the odd one (with respect to zygote)

1. Formed in the water or inside the body of the organism

2. Develops a thick wall in all organisms

3. The vital link between the two generations

4. Divides by meiosis in the haplontic life cycle

Development of a new individual from a single gamete without fusion with another gamete is called

1. Parthenocarpy

2. Sporophytic budding

3. Parthenogenesis

4. Polyembryony

In most of the aquatic algae, syngamy occurs in the external medium. In this condition

1. Organism shows great synchrony between the sexes

2. The small number of gametes and produced

3. The female gamete is not released into the water

4. Male gamete should develop before the female gamete