Class 7 Science - Chapter Reproduction in Plants NCERT Solutions | Explain the difference between self-poll
Explain the difference between self-pollination and cross-pollination.
Pollination is the transfer of pollen grains from the anther to the stigma of the flower which can be achieved by biotic (insects, birds etc.) and abiotic (wind, water etc.) pollinating agents. On the basis of pollinating mechanism, plants can be grouped into two mating systems: self- pollinated and cross- pollinated.
| Self- Pollination | Cross Pollination |
| 1. The pollen grain moves to the female part of the same flower or different flower of the same plant species. | 1. The pollen grains are transferred to the flower present on the different plant. |
| 2. Transfer to the same flower is autogamy; and to another flower on the same plant is geitonogamy. | 2. Cross- pollination is also known as allogamy. |
| 3. No genetic variation occurs. | 3. High genetic variation are found. |
| 4. Identical species are created, i.e. no new species are formed. | 4. New species are formed. |
| 5. Transfer of pollen grains are limited. | 5. Transfer of pollen grains unlimited, i.e. in large amount. |
More Questions From Class 7 Science - Chapter Reproduction in Plants
- Q:-
Sketch the reproductive parts of a flower.
- Q:-
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:-
Describe the various ways by which seeds are dispersed.
- Q:-
Describe the different methods of asexual reproduction. Give examples.
- Q:-
How does the process of fertilisation take place in flowers?
- Q:-
State the main difference between asexual and sexual reproduction.
- Q:-
Explain what you understand by sexual reproduction.
- Q:-
Tick the correct answer:
(a) The reproductive part of a plant is the
(i) leaf (ii) stem (iii) root (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(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 - Q:-
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 _____________.
Popular Questions of Class 7 Science
- Q:-
State similarities and differences between the laboratory thermometer and the clinical thermometer.
- Q:-
State differences between acids and bases.
- Q:-
Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food - Q:-
Name the elements that determine the weather of a place.
- Q:-
Fill the missing word in the blank spaces in the following statements:
(a) Wind is——————air.
(b) Winds are generated due to —————— heating on the earth.
(c) Near the earth’s surface __________air rises up whereas ___________ air comes down.
(d) Air moves from a region of ——— pressure to a region of ———. - Q:-
In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants - Q:-
Why does an athlete breathe faster and deeper than usual after finishing the race?
- Q:-
Match structures given in Column I with functions given in Column II.
Column I Column II
(i) Stomata (a) Absorption of water
(ii) Xylem (b) Transpiration
(iii) Root hairs (c) Transport of food
(iv) Phloem (d) Transport of water
(e) Synthesis of carbohydrates - Q:-
Classify the following as motion along a straight line, circular or oscillatory motion:
(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge. - Q:-
Why do organisms need to take food?
Recently Viewed Questions of Class 7 Science
- Q:-
Zubeda made an electric circuit using a cell holder shown in Fig. 14.4, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.
- Q:-
Describe the process of neutralisation with the help of an example.
- Q:-
What is sludge? Explain how it is treated.
- Q:-
In the circuit shown in Fig. 14.25
(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position? - Q:-
Show the shape of the distance-time graph for the motion in the following cases:
(i) A car moving with a constant speed.
(ii) A car parked on a side road. - Q:-
List the similarities and differences between aerobic and anaerobic respiration.
- Q:-
The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
- Q:-
Draw a diagram of the human excretory system and label the various parts.
- Q:-
Why is blood needed by all the parts of a body?
- Q:-
The silkworm is: (a) a caterpillar, (b) a larva. Choose the correct option.
(i) a (ii) b (iii) both a and b (iv) neither a nor b.
- All Chapters Of Class 7 Science
- All Subjects Of Class 7