Question

Ch – How do organisms reproduce?

1. Fruits are formed from

a. Stamen

b. Stigma

c. Ovary

d. Ovule

2. Which among the following is a unicellular organism that reproduces by

budding? (a) Hydra

(b) Planaria

(c) Yeast

(d) Spirogyra

3. Which among the following does not reproduce by spore formation:

(a) Penicillium fungus

(b) Yeast fungus

(c) Mucor fungus

(d) Rhizopus fungus

4. The rapid spreading of bread mould on slices of bread are 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)

5. 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

6 Reason for the greater similarities among the off springs 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)

7. 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

8. The number of chromosomes in parents and off springs 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

9. 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

10. The number of chromosomes in both parents and off springs of a particular

species remains constant because: (a) Chromosomes get doubled after zygote

formation

(b) Chromosomes get doubled after gamete formation

(c) Chromosomes get halved during gamete formation
(d) Chromosomes get halved after gamete formation

11. 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

(ii) It always results in the formation of zygote

(iii) off springs formed are clones

12. Reproductions essential for living organisms in order to

(a) Keep the individual organism alive

(b) Fulfil their energy requirement

(c) Maintain growth

(d) Continue the species generation after generation,

13. Planaria’smost remarkable characteristics are its ability to

A) Hibernation

b) Survive without air

c) Generate bioluminescence

d) Regenerate

14. Bryophyllum daigremontianum reproduces by

a).Vegetative propagation

b) Budding

c).Fission

d).Fragmentation

15. Budding, in hydra, is a form

A) Apoptosis

b) Sexual reproduction

c) Asexual reproduction

d) None of the above

16.____________is not a method of vegetative propagation A) Grafting

b) Cutting

c) Plasmogenesis

d) Layering
of class 10 biology
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Answer 1

Answer:

1. ovary

2. yeast

3.yeast fungus

4. iii and iv

5. Breaking up of filaments into smaller bits.

6.i and iv

7. Multiple fission

8.Halving of chromosomes during gamete formation

10. Chromosomes get halved during gamete formation

11. Hydra

12. Continue the species generation after generation.

13.Regenerate

14. Vegetative propagation

15. Asexual reproduction

16. Grafting