Microbes in Human Welfare — 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.

Name the interactions in each of the following?

1. Cuscuta growing on a shoe flower plant.
2. Mycorrhizae living on the roots of higher plants.
3. Clown fish living among the tentacles of sea anemone.
4. Koyel laying her eggs in crow's nest.

Write one example each of commensalism and mutualisms.

What kind of organs are the thorn of Bougenvillia and the tendril of cucurbita? What type of development has brought about such similarity in them?

Genetic engineering has been successfully used for producing.

1. Transgenic mice for testing safety of polio vaccine before use in humans.
2. Transgenic models for studying new treatments for certain cardiac diseases.
3. Transgenic Cow-Rosie which produces high fat milk for making ghee.
4. Animals like bulls for farm work as they have super power.

How do neutrophils act as a cellular barrier to pathogens in humans?

If one nucleotide (encircled) gets missed in the given series then how many amino acid will be changed?
AUG (U)AU CAA AAG UAG

Give the answer of the following:
Which group of vertebrates comprises the highest number of endangered species?

Name two STDs that are not curable.

In which book has the description of the endangered species of the world been published?