Isogametes are seen in:

1. Cladophora

2. Fucus

3. Human beings

4. Ficus

The number of chromosomes in a meiocyte of the fruit fly is:

(1) 4

(2) 8

(3) 12

(4) 16

The most critical event in sexual reproduction is:

(1) Gametogenesis

(2) Gamete transfer

(3) Fertilization

(4) Embryogenesis

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

In animals exhibiting internal fertilization:

1. There is high synchrony between the two sexes

2. The chances of desiccation of the embryo is high

3. The male gamete is motile

4. Vulnerability to predators is increased

Rotifers:

(1) Exhibit adult reproductive structures in juvenile phase

(2) Are plants that can be both monoecious or dioecious

(3) Produce gametes by mitosis

(4) Are animals capable of reproducing by parthenogenesis

With respect to external fertilization, which of the following is not an advantage of internal fertilization?

1. A decreased risk of disease transmission

2. Minimal waste of gametes

3. Greater chances of individual egg fertilization

4. Relatively longer time of egg protection

Monoecious plant of Chara shows occurrence of

(1) antheridiophore and archegoniophore on the same plant

(2) stamen and carpel on the same plant

(3) upper antheirdium and lower oogonium on the same plant

(4) upper oogonium and lower antheridium on the same plant

What would be the number of chorosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

(1) 63

(2) 84

(3) 21

(4) 42

Flowers are unisexual in

(1) pea

(2) cucumber

(3) china rose

(4) onion