A horse and donkey can breed to produce mule, which is an infertile animal. The infertility is because horse and donkey belong to different.

A plant having yellow leaves with dead spots has the deficiency of

Consider the following statements about cactus.

1. The leaves are reduced to spines.

2. The stem does the photosynthesis.

Which of the statements given above is/are correct?

In which one of the following methanogens, i.e. methane producing bacteria are not present?