Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Mark the odd one the following groups.
Oogonia, Spermatogonia, Zygote, Ootid.

What does the density of forests increase?

State the type of interaction that exists between ticks and dogs.

Arrange the following as you observe in vertical stratification of a forest-Grass, Shrubby plants, Teak, Amaranthus.

What per cent of the earth's surface was covered by tropical rain forests at:

1. The beginning of 20th century.
2. Now, respectively?

What is the old name of RCH programmes? When was it initiated in India?

Sometimes cattle or even human beings give birth to their young ones that have extremely different sets of organs like limbs/position of eye(s), etc. Why?

Name two plants where remnants of nucellus can be found in seeds.

State what does standing crop of a trophic level represent.

Give the names of some invasive species in India