Chemical Coordination and integration — BIOLOGY STD 11 Science — Question

Which specialised structures are present in liverworts for asexual reproduction?

A student cultures a callus from the tobacco pith in a sterilised minimal nutritive medium, but adds more cytokinins than auxins. What would develop first from the callus the shoot buds or the roots?

What do you understand by tidal volume?

Which hormone affects male sexual behaviour (libido) by acting on the central nervous system?

Why digestion of food is necessary?

Give a specific scientific term for the following statements:
(a) The point at which two daughter half- chromosomes/daughter chromatids are joined together.
(b) Nuclear division.
(c) The time interval between two successive mitotic divisions.
(d) A process of cell division in which the number of chromosomes is reduced to half, which is followed by cytoplasmic division.
(e) That stage of the cell cycle in which mainly synthesis of proteins and RNA takes place.

What is a co-enzyme?

What is the term used for the stimulus of adequate strength?

In swampy areas like the Sunderbans in West Bengal, plants bear special kind of roots called _____________.

1. What are bracteate flowers?
2. What are parthenocarpic fruits?
3. Give two examples of non-endospermic seeds? Why are they called so?