Class 7 Science - Chapter Reproduction in Plants NCERT Solutions | State the main difference between asexua

Sketch the reproductive parts of a flower.

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

Describe the various ways by which seeds are dispersed.

How does the process of fertilisation take place in flowers?

Describe the different methods of asexual reproduction. Give examples.

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

Explain what you understand by sexual reproduction.

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

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 _____________.

State similarities and differences between the laboratory thermometer and the clinical thermometer.

State differences between acids and bases.

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

Name the elements that determine the weather of a place.

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 ———.

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

Why does an athlete breathe faster and deeper than usual after finishing the race?

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

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.

Why do organisms need to take food?

Fill in the blanks.
(i) The blood from the heart is transported to all parts of the body by the.
(ii) Haemoglobin is present in cells.
(iii) Arteries and veins are joined by a network of .
(iv) The rhythmic expansion and contraction of the heart is called.
(v) The main excretory product in human beings is.
(vi) Sweat contains water and.
(vii) Kidneys eliminate the waste materials in the liquid form called.
(viii) Water reaches great heights in the trees because of suction pull caused by .

There are ten tubewells in a lane of fifty houses. What could be the long term impact on the water table?

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

How do elephant living in the tropical rainforest adapt itself?

Explain why there is no waste in a forest.

Micro-organisms act upon the dead plants to produce
(i) sand     (ii) mushrooms     (iii) humus     (iv) wood

Choose the correct option:

(a) In plants, water is transported through
(i) xylem                  (ii) phloem
(iii) stomata             (iv) root hair

(b) Water absorption through roots can be increased by keeping the plants
(i) in the shade
(ii) in dim light
(iii) under the fan
(iv) covered with a polythene bag

You have been asked to maintain a garden. How will you minimise the use of water?

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Can we survive only on raw, leafy vegetables/grass? Discuss.