Describe the different methods of asexual reproduction. Give examples.
Asexual reproduction is the simplest form of reproduction in which only one parent is involved. It do not involves the meiosis, gamete formation and fusion of gametes. This asexual reproduction is also known as clonal propagation because of their genetically identical products.
The asexual reproduction in plants can take place by the following methods:
1. Vegetative propagation: It is the natural process that is found in many plant species. It is a process by which plant reproduces without the production of seeds and spores. In this growth of new plants from the plant parts (like bulbs, runners, stems cuttings, roots and leaves etc.) occurs. Tissue culture is also the method of vegetative propagation under the sterile conditions.
Examples: Tuber of potato, the rhizome of ginger etc.
2. Budding: In budding process a small part of the body of the parent plant grows as a bulb- like structure called ‘bud’ which then detaches and becomes a new plant or we can say formation of daughter individual from the small projection called the bud that arises on the parent body is known as budding.
Example: Yeast (unicellular fungi), Hydra etc.
3. Fragmentation: The breaking up of the body of a plant into two (or more) pieces on maturing, each of which automatically grows to form a new plant, is called fragmentation. An alga reproduces by the asexual method of fragmentation. An example of common alga is Spirogyra. Spirogyra is a green, filamentous alga plant which is found in ponds, lakes and slow moving streams. Spirogyra reproduces by the asexual method of reproduction called fragmentation.
4. Spore Formation: Propagules which germinate to produce new individuals are known as spores. There are several types of spores: zoospores, sporangiospores, chlamydospores, oidia and conidia.
Popular Questions of Class 7 Science
- 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:-
Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down Across
(D) 1 : Thorough washing (A) 1 : Keeps warm
2 : Animal fibre 2 : Its leaves are eaten by silkworms
3 : Long thread like structure 3 : Hatches from egg of moth
- Q:-
Sketch the cross section of soil and label the various layers.
- Q:-
Here is a crossword puzzle: Good luck!
Across
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human bodyDown
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
7. A chemical to disinfect water - Q:-
Take three test-tubes. Fill æth of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?
- Q:-
Sketch the reproductive parts of a flower.
- Q:-
Solve the following crossword puzzle with the clues given:
Across
2. Plantation prevents it.
5. Use should be banned to avoid soil pollution.
6. Type of soil used for making pottery.
7. Living organism in the soil.Down
1. In desert soil erosion occurs through.
3. Clay and loam are suitable for cereals like.
4. This type of soil can hold very little water.
5. Collective name for layers of soil. - Q:-
Describe how crystals of copper sulphate are prepared.
- Q:-
Match the items in Column I with those in Column II:
Column I Column II
(i) A home for living organisms (a) Large particles
(ii) Upper layer of the soil (b) All kinds of soil
(iii) Sandy soil (c) Dark in colour
(iv) Middle layer of the soil (d) Small particles and packed tight (v) Clayey soil (e) Lesser amount of humus - Q:-
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Recently Viewed Questions of Class 7 Science
- Q:-
Name two chemicals used to disinfect water.
- Q:-
Sketch the reproductive parts of a flower.
- Q:-
A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in
(i) polar regions (ii) deserts
(iii) oceans (iv) tropical rainforests - Q:-
Describe the steps involved in getting clarified water from wastewater.
- Q:-
Explain how painting of an iron gate prevents it from rusting.
- Q:-
Which of the following are not correct?
(i) The basic unit of time is second.
(ii) Every object moves with a constant speed.
(iii) Distances between two cities are measured in kilometres.
(iv) The time period of a given pendulum is not constant.
(v) The speed of a train is expressed in m/h. - Q:-
Draw a diagram of the human excretory system and label the various parts.
- Q:-
Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down Across
(D) 1 : Thorough washing (A) 1 : Keeps warm
2 : Animal fibre 2 : Its leaves are eaten by silkworms
3 : Long thread like structure 3 : Hatches from egg of moth - 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. - 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.
- NCERT Chapter