BIRLA PUBLIC SCHOOL – DOHA – QATAR
WORKSHEET- 17
SCIENCE
CH -12 REPRODUCTION IN PLANTS
NAME OF THE STUDENT CLASS/DIV: VII
----------------------------------------------------------------------------------------------------
Multiple Choice Questions:
1. In yeast reproduction occurs by
(a) fragmentation
(b) binary fission
(c) budding
(d) spore formation
2. In which of the following plants do we have buds present on the margins
of leaves?
(a) Bryophyllum
(b) Tulsi
(c) Mint
(d) Coriander
3. Seeds of drumstick and maple plants are carried to long distances by
wind because they possess
(a) winged seeds
(b) large and hairy seeds
(c) long and ridged fruits
(d) spiny seeds
4. The ‘eye’, of the potato can be compared to
(a) the root of a plant.
(b) the bud of a flowering plant.
(c) the bud in the margin of a Bryophyllum leaf
(d) the anther in the stamen of a flower.
5. The ovaries of different flowers may contain
(a) only one ovule
(b) many ovules
(c) one to many ovules
(d) only two ovules
6. Which of the following statements is/are true for sexual reproduction in
plants?
(i) Plants are obtained from seeds
(ii) Two plants are always essential
(iii) Fertilisation can occur only after pollination
(iv) Only insects are agents of pollination
Choose from the options given below:
(a) (i) and (ii)
(b) (i) only
(c) (i) and (iii)
(d) (i) and (iv)
7. Pollination refers to the:
(a) transfer of pollen from anther to ovary
(b) transfer of male gametes from anther to stigma
(c) transfer of pollen from anther to stigma
(d) transfer of pollen from anther to ovule
8. Lila observed that a pond with clear water was covered up with green
algae within a week. By which method of reproduction did the algae spread
so rapidly?
(a) Budding
(b) Sexual reproduction
(c) Fragmentation
(d) Pollination
9. Which of the following parts of a plant have a role in the sexual
reproduction in plants?
(i) Flower
(ii) Seed
(iii) Fruit
(iv) Branch
Choose the correct answer from below:
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (iii) and (iv)
(d) (ii), (iii) and (iv)
10. Female gametes are present in
(a) stigma
(b) pollen tube
(c) ovary
(d) anther
Answer the following questions:
11. After the rainy season, while was strolling in her garden, Mani noticed
many small new plants whose fruits and flowers were not present in her
garden. She wondered where these had come from as nobody had
planted them there. Can you give a reason why and where these plants
came from?
ANS: The small plants which were not there in the garden a week ago may
have grown due to random seed dispersal by agents of pollination like
wind, birds, water, animals. These seeds on germination in a suitable
environment must have germinated into fresh new plants.
12. Artificial propagation of plants is growing of new plantlets by means
other than from natural means. It includes methods like cutting, grafting,
layering, etc. It is an easy process and is a faster way of propagation of
many plants with desired characteristics. But with the increased practice
of artificial propagation man is risking the existence of many native
varieties of plants.
(a) What are the advantages of artificial propagation of plants?
ANS:
❖ Plants take less time to produce flowers and fruits.
❖ Plants are exact copies of the parent plant.
❖ Plants take less space and energy to give productive yield.
(b) What are the disadvantages of artificial propagation of plants?
ANS:
❖ Plants do not show much variation and lose their strength and health
gradually.
❖ They are more prone to disease.
❖ As many plants are produced, it may result in overcrowding
❖ Some plants do not have strong root system which may collapse with
time.
(c) What is native variety?
ANS:
Native variety of a plant is one that occurs naturally in a particular habitat
or ecosystem or region.
(d) Do you think there is any adverse affect of artificial propagation on the
native varieties of plants?
ANS:
Yes. If the non-native varieties of plants are propagated on a large scale
artificially can eliminate the existence of native variety of that plant due to
competition for space and nutrition.
13. Write how the following seeds are dispersed.
(a) Seeds with wings
(b) Small and light seeds.
(c) Seeds with spines/hooks
ANS:
(a) Dispersed by wind
(b) Dispersed by wind
(c) Dispersed by animals
14. Which is more advantageous for plants-self-pollination or cross-
pollination? Give reasons for your answer.
ANS:
Cross-pollination is more advantageous as it help the plant in having
variation in offsprings, new varieties are formed, make plant to adapt to
new changes in environmental conditions and diseases. It helps the plant
to yield better.
15. Is brinjal a vegetable or a fruit? Justify your answer.
ANS:
Brinjal is actually fruit of the plant which we take or consume as vegetable.
Brinjal develops from the fertilised ovary of the flower and contains many
seeds.
16. What are the advantages of vegetative propagation?
ANS:
❖ The plants that are produced from vegetative propagation grow faster.
❖ The plants that reproduce with vegetative reproduction have fruits
and flowers ahead of time.
❖ The off springs that are produced will have the same characteristics
as that of their parents.
❖ More number of plants can be produced in less time.
17. In the vegetative propagation, the new plants are exact copies of the
parent cell. Why?
ANS: Because they are produced from a single parent.
18.Boojho had the following parts of a rose plant-a leaf, roots, a branch, a
flower, a bud and pollen grains. Which of them can be used to grow a new
rose plant?
ANS: A branch
Question No 19 and 20 consist of two statements – Assertion (A) and
Reason R. Answer these questions selecting the appropriate option given
below:
a) Both A and R are true, and R is the correct explanation of the
assertion.
b) Both A and R are true, but R is not the correct explanation of the
assertion.
c) A is true, but R is false.
d) A is false, but R is true.
19. Assertion: A bisexual flower has both male and female reproductive
parts.
Reason: Fusion of male and female gametes is called pollination.
ANS:
C. A is true, but R is false.
20. Assertion: The spores are asexual reproductive bodies.
Reason: Asexual reproduction produces a new plants from a single
parent
ANS:
b. Both A and R are true, but R is not the correct explanation of the
assertion.
.......................................................................
