The Online Biology Olympiad, Final round. Objectives Test one(Cell division, meiosis and mitosis). Duration: 10minutes, 15marks

1.

1 point

The mechanism ensuring genetic continuity in mitosis is .........

formation of two daughter cells

halving of chromosome number between the two new cells

formation of two daughter cells with identical kind of DNA

formation of cells with 8 chromosomes

2.

1 point

During meiosis, crossing over occurs at .........

pachytene

leptotene

diplotene

diakinesis

3.

1 point

During cell division in the apical meristem, the nuclear membrane appears in ........

anaphase

telophase

cytokinesis

metaphase

4.

1 point

During cell division, sometimes there will be failure of separation of sister chromatids. This event is called ........

coincidence

fusion

non disjunction

interference

5.

1 point

How many generations of mitotic division must occur in a cell of root tip to form 256 cells?

128

64

32

8

6.

1 point

Pairing of homologous chromosomes can be seen during ..........

zygotene

diplotene

pachytene

leptotene

7.

1 point

The resting phase in mitosis is ........

interphase

telophase

exophase

anaphase

8.

1 point

Which aspect of mitosis is affected by colchicine in inducing polyploidy?

DNA replication

formation of cell plate

spindle formation

chromosome doubling

9.

1 point

The cell cycle of a germinal cell has .........

very short prophase in first division

two successive mitotic divisions

two successive reduction divisions

one reduction division followed by one mitotic division

10.

1 point

How many daughter cells are produced in a mitotic division?

2

8

6

4

11.

1 point

A cell divides every one minute. At this rate of division, it can fill a 100ml of beaker in one hour. How many much time does it take to fill a 50ml beaker?

60 minutes

30 minutes

1 minute

59 minutes

12.

1 point

How many mitotic divisions are needed for a single cell to make 128 cells?

7

32

14

28

13.

1 point

Mitotic anaphase differs from metaphase in possessing .........

same number of chromosomes and half number of chromatids

same number of chromosomes and same number of chromatids

half number of chromosomes and half number of chromatids

half number of chromosomes and same number of chromatids

14.

1 point

Cell division of mitosis is a normal process in a living cell, but sudden and abnormal mitosis in an organ will some time result in .......

zygote

gastrula

cancer

new organ

15.

1 point

One of these is not a unique feature of meiosis:

reduction division

cytokinesis

synapsis

homologous recombination

16.

1 point

During mitosis, the endoplasmic reticulum and nucleolus begin to disappear at ......

late metaphase

early prophase

late prophase

early metaphase

17.

1 point

Homologous chromosomes are .........

physiologically dissimilar

genetically dissimilar

morphologically and genetically similar

those which pair during synapsis

18.

1 point

In aerobic respiration, oxidative phosphorylation takes place in .......

lysosomes

cytoplasm

ribosomes

mitochondrion

19.

1 point

The penultimate stage in a mitotic division is .........

telophase

anaphase

prophase

metaphase

20.

1 point

In how many cells the meiotic division has taken place, if the total number of spermatids produced is 32?

4

16

32

8