Explain the process of segmentation with the help of a proper example of plants.

Mention any two phenomena during G1 phase of Interphase.

Explain the following three significances of cell division- Growth Repair Reproduction Tabulate the site of occurrences of meiotic cell division in the living world. [3+2=5] OR Explain the process of micropropagation. Distinguish between asexual and sexual reproduction on the basis of the following three features - No. of Parental organisms Cell Division Origin of variation [2+3=5]

Write one function of each of the following five parts of the human eyeball: [1 × 5 = 5] (a) Cornea (b) Lens (c) Choroid (d) Vitreous humour (e) Retina OR Mention three changes occurring during the Anaphase stage of mitosis in an animal cell. Write the names of any two structural parts of the eukaryotic chromosome. [ 3 + 2 = 5]

Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns COLUMN - A COLUMN - B 1. Meninges (a) Decrease in the number of digits in the legs 2. Sexual reproduction (b) Submergence of islands 3. Roller tongue (c) Centromere 4. Evolution of the horse (d) Telomere 5. Environmental problem of Sundarban (e) Protects brain and spinal cord from mechanical injury 6. Attaches chromosome with spindle fibre (f) Controlled by autosome (g) Occurs through the production of gametes and their union

Cell division becomes uncontrolled if the function of checkpoints becomes hampered

How does the Cytokinesis of plant cell happen?

Prepare a list of sites of occurrence of meiotic cell division in plants as well as in animals.

Compare DNA and RNA on the basis of the following features — (a) Nature of carbohydrate (b) Nature of pyrimidine base

Show the chemical constituents of chromosomes with the help of a table.

Explain the following two significances of meiotic cell division — Maintains the constant number of chromosomes in a species Origin of variation in an organism

Tabulate which changes occur in a chromosome during the Anaphase of Karyokinesis.