Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Mention the function of mitochondria in sperm.

Name the three important components of biodiversity.

The base sequence in one of the strands of DNA is TAGCATGAT

1. Give the base sequence of its complementary strand.
2. How are these base pairs held together in a DNA molecule?
3. Explain the base complementarity rules. Name the scientist who framed this rule.

1. Name the causative agent of amoebiasis and mention its symptoms.
2. Write how it spreads.

OR

A patient is down with Amoebiasis. List the symptoms that confirm this infection. Name the causative pathogen.

Mention the advantages of selecting pea plant for experiment by Mendel.

Differentiate between the following:

Repetitive DNA and Satellite DNA.

The length of a DNA molecule in a typical mammalian cell is calculated to be approximately 2.2m. How is the packaging of this long molecule done to accommodate it within the nucleus of the cell?

Which part in the male reproductive system stores sperms?

Embryo sacs of some apomictic species appear normal but contain diploid cells. Suggest a suitable explanation for the condition.

Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.