Evolution — BIOLOGY STD 12 Science — Question

Match Column I with Column II.

S. No.	Column I	S. No.	Column II
A.	Acrosome	1.	Motility of sperm towards the egg.
B.	Head	2.	Powerhouse of the sperm; contains a number of mitochondria.
C.	Tail	3.	Contains the genetic material.
D.	Middle piece	4.	Contains enzymes to dissolve egg envelopes.

Which one is tailed with adenylate residue, between 3' end and 5' end of hnRNA?

Name the two intermediate hosts which the human liver fluke depends on to complete its life cycle so as to facilitate parasitization of its primary host.

How many breeding varieties of pea plant were selected by Mendel?

Write an example where Punnett square can be effectively used.

What is meant by PM 2.5?

Mention the stages of meiosis, when:

1. The pairs of homologous chromosomes align at the equator of the spindle.
2. The pairs of homologous chromosomes segregate independently of each other.

Name an industry which can cause both air and thermal pollution and as well as eutrophication.

Polyblend is synthesised with the help of which compounds?

Who developed the technology of biogas production in India?