During meiosis, the bivalent chromosomes clearly appear as tetrads first at:
1. Zygotene of prophase I
2. Pachytene of Prophase I
3. Metaphase I
4. Anaphase I

During diakinesis of prophase I:
I. Terminalisation of chiasmata takes place
II. Meiotic spindle is assembled.
III. Nucleolus disappears and the nuclear membrane breaks down.
The correct statements are:

1. I, II and III

2. I and II only

3. I and III only

4. II and III only

Consider the following two statements:
III. Plant cells undergo cytokinesis in a different manner than the animal cells
IV. Plant cells are enclosed by a relatively inextensible cell wall.
Of the two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct

Cells at the end of prophase of mitosis, when viewed under the microscope, do not show:
I. Golgi complexes
II. Endoplasmic reticulum
III. Nucleolus
IV. Nuclear envelope
1. Only I and II are correct
2. Only III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct

Given below is an electron microscopic structure of:

1. Cilium

2. Flagellum

3. Fimbria

4. Centriole

The following diagram shows

1. Formation of sperms from spermatogonia
2. Protein synthesis apparatus in eukaryotic cells
3. The endomembranous system of eukryotic cells
4. The cytoskeleton of a Moneran cell

A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is
1. Absence of mitochondria
2. Presence of cell wall
3. Presence of haemoglobin
4. Absence of nucleus

Select one which is not true for ribosome
1. Made of two sub units
2. Form poly some
3. May attach to m RNA
4. Have no role in protein synthesis 

Which of the following dyes is best suited for staining chromosomes?
1. Basic Fuchsine
2. Safranin
3. Methylene blue
4. Carmine 

Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings

Options: