NCERT-10-How do Organisms Reproduce

1. Which among the following is a unicellular organism that reproduces by budding?

• (a) Plants

• (b) Planaria

• (c) Yeast

• (d) Spirogyra

Which among the following does not reproduce by spore formation?

• (a) Penicillium

• (b) Yeast

• (c) Mucor fungus

• (d) Rhizopus

The rapid spreading of bread mould on slices of bread is due to:

(i) Presence of large number of spores in air.

(ii) Presence of large number of thread-like branched

hyphae.

(iii) Presence of moisture and nutrients.

(iv) Formation of round shaped sporangia.

• (a) (i) and (iii)

• (b) (ii) and (iv)

• (c) (i) and (ii)

• (d) (iii) and (iv)

The asexual reproduction in the Spirogyra involves-----

• (a) Breaking up of filaments into smaller bits

• (b) Division of a cell into many cells

• (c) Division of a cell into two cells

• (d) Formation of a large number of buds

Reason for the greater similarities among the offsprings produced by asexual reproduction, is:

(i) Asexual reproduction involves only one parent

(ii) Asexual reproduction involves two parents

(iii) Asexual reproduction involves gametes

(iv) Asexual reproduction does not involve gametes

• (a) (i) and (ii)

• (b) (i) and (iii)

• (c) (ii) and (iv)

• (d) (i) and (iv)

The process of the division of cell into several cells during reproduction in Plasmodium is termed as:

• (a) Fragmentation

• (b) Budding

• (c) Multiple fission

• (d) Binary fission

The number of chromosomes in parents and offsprings of a particular species remains constant due to:

• (a) Doubling of chromosomes after zygote formation

• (b) Halving of chromosomes during gamete formation

• (c) Doubling of chromosomes after gamete formation

• (d) Halving of chromosomes after gamete formation

A Planaria worm is cut horizontally in the middle into two halves P and Q such that the part P contains the whole head of the worm. Another Planaria worm is cut vertically into two halves R and S in such a way that both the cut pieces R and S contain half head each. Which of the cut pieces of the two Planaria worms could regenerate to form the complete respective worms?

• (a) Only P

• (b) Only R and S

• (c) P, Rand S

• (d) P, Q, R and S

An organism capable of reproducing by two asexual reproduction methods one similar to the reproduction in yeast and the other similar to the reproduction in Planaria is:

• (a) Spirogyra

• (b) Hydra

• (c) Bryophyllum

• (d) Paramecium

Which out of the following processes does not lead to the formation of clones:

• (a) Fertilisation

• (b) Fission

• (c) Tissue culture

• (d) Fragmentation