Reproductive Health — BIOLOGY STD 12 Science — Question

In papaya and date palm, both male and female flowers are present on the same plant.

20 percent of the total oxygen in the earth's atmosphere is produced by temperate forests like Amazon forest.

Identify True/ False statements. Correct each false statement to make it true.
Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/ False)

Trichoderma is a fungus used as a biocontrol agent.

In a hydrarch succession, the marsh-meadow stage is preceded by the scrub stage.

Identify True/ False statements. Correct each false statement to make it true.
Androgens are produced by Sertoli cells. (True/ False)

Plants produced through vegetative propagation are called clones.

Sepals and petals or perianth are inconspicuous in entomophilous flowers.

Organisms living in water bodies (lake, sea, river) do not face any water related problems. [True/ False]

State whether the following are true or false:
The pyramid of energy is always inverted. It can never be upright.