Cell Division — Biology STD 10 — Question

An experiment was set up as shown in the figure alongside. Look at the figure and answer the following questions:
( i) What is the objective of this experiment?
( ii ) Which plant is used in this experiment?
( iii ) Which gas is evolved in this process?
( iv ) What will happen to the rate of evolution of this gas if a pinch of sodium
bicarbonate is added?
(v ) What will happen if the apparatus is kept in dark?

Give Reasons
Missing of menses is the first indication of pregnancy.

Give a labeled diagram of parathyroid gland.

Explain the Term :
Double circulation

The alongside diagram A shows a root hair growing through the soil particles. Diagram B is the root hair of an aquatic plant.

(i) Name the parts 1,2,3.
(ii) Name two substances which enter the root hair. What are their uses?
(iii) By what process do these substances enter the root hair?
(iv) Account for the different shapes of root hairs in the two diagrams.

Draw a labelled diagram of a mature human sperm.

Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the terms in Column ‘II’ with a suitable idea given in Column ‘I’.

Column I	Column II
(i) Anaphase	(a) Chromosomes become arranged in a horizontal plane at the equator.
(ii) Prophase	(b) Daughter chromosomes move to opposite poles of the spindle.
(iii) Telophase	(c) Chromosomes become visible as fine, long threads.
(iv) Metaphase	(d) Chromosomes lose their distinctiveness and gradually become transformed into chromatin network.

Differentiate between: Active immunity and Passive immunity.

Differentiation between:
Guttation and bleeding