NCERT Solutions for Class 7th Science

Chapter 12 – REPRODUCTION IN PLANTS

(Complete Downloadable Chapter Solution PDF file is at the bottom of the page)

 

Q.1      Fill in the blanks:

          (a) Production of new individuals from the vegetative part of parent is called__________.

          (b) A flower may have either male or female reproductive parts. Such a flower is called________.

          (c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the                   same kind is known as _____________.

          (d) The fusion of male and female gametes is termed as _____________.

          (e) Seed dispersal takes place by means of ___________, ___________ and __________.

Ans    (a) Production of new individuals from the vegetative part of parent is called _vegetative propagation_.

          (b) A flower may have either male or female reproductive parts. Such a flower is called _unisexual                         flower_.

          (c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the                   same kind is known as _pollination_.

          (d) The fusion of male and female gametes is termed as _fertilisation_.

          (e) Seed dispersal takes place by means of _wind_, _water_ and _animals_.

Q.2      Describe the different methods of asexual reproduction. Give examples.

Ans     In asexual reproduction new plants are obtained without production of seeds or spores. Different                          methods of asexual reproduction are:

           1) Vegetative propagation: New plants are produced from different vegetative parts such as leaves, stems            and roots. Eg. Potato

           2) Budding: A new organism is formed from a small bulb-like projection called bud. The bud gradually                  grows and gets detached from the parent and forms a new organism. Eg. Yeast.

           3) Fragmentation: A new individual is formed due to breaking up of the parent into fragments. Eg. Algae.

           4) Spore formation: Numerous pores which are protected by covering called cell wall are released from                parent plant. Under favourable conditions, a spore germinates and develops into a new individual. Eg.                  Moss and ferns.

Q.3      Explain what you understand by sexual reproduction.

Q.4      State the main difference between asexual and sexual reproduction.

Q.5      Sketch the reproductive parts of a flower.

Q.6      Explain the difference between self-pollination and cross-pollination.

Q.7      How does the process of fertilisation take place in flowers?

Q.8      Describe the various ways by which seeds are dispersed.

Q.9      Match items in Column I with those in Column II:

Column I                     Column II

(a) Bud                        (i) Maple

(b) Eyes                       (ii) Spirogyra

(c) Fragmentation     (iii) Yeast

(d) Wings                    (iv) Bread mould

(e) Spores                    (v) Potato

                                    (vi) Rose

Q.10     Tick (√) the correct answer:

            (a) The reproductive part of a plant is the

            (i) leaf              (ii) stem           (iii) root           (iv) flower

Ans      iv) flower

            (b) The process of fusion of the male and the female gametes is called

            (i) fertilisation             (ii) pollination

           (iii) reproduction          (iv) seed formation

Ans      (i) fertilisation

(c) Mature ovary forms the

(i) seed                                     (ii) stamen

(iii) pistil                      (iv) fruit

(d) A spore producing plant is

(i) rose                                     (ii) bread mould

(iii) potato                    (iv) ginger

(e) Bryophyllum can reproduce by its

(i) stem                        (ii) leaves

(iii) roots                      (iv) flower