{"id":24398,"date":"2021-06-16T16:55:37","date_gmt":"2021-06-16T11:25:37","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=24398"},"modified":"2022-03-02T10:38:20","modified_gmt":"2022-03-02T05:08:20","slug":"ncert-solutions-for-class-7-science-chapter-12","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-12\/","title":{"rendered":"NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants"},"content":{"rendered":"

These NCERT Solutions for Class 7 Science<\/a> Chapter 12 Reproduction in Plants Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.<\/p>\n

Reproduction in Plants NCERT Solutions for Class 7 Science Chapter 12<\/h2>\n

Class 7 Science Chapter 12 Reproduction in Plants Textbook Exercise Questions and Answers<\/h3>\n

Question 1.
\nFill in the blanks:
\na. Production of new individuals from the vegetative part of parent is called ………………
\nb. A flower may have either male or female reproductive parts. Such a flower is called ………………
\nc. 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 ………………
\nd. The fusion of male and female gametes is termed as ………………
\ne. Seed dispersal takes place by means of ………………, ……………… and ………………
\nAnswer:
\na. vegetative propagation
\nb. unisexual flower
\nc. pollination
\nd. fertilisation
\ne. wind, water, animals<\/p>\n

Question 2.
\nDescribe the different methods of asexual reproduction. Give examples.
\nAnswer:
\nThere are following methods of asexual reproduction:
\na. Vegetative propagation: In this asexual reproduction, new plants are produced from roots, stems, leaves and buds of individual plant. For example: stem cutting in champa, eye growth in potatoes, leaf bud in case of Bryophyllum, etc.<\/p>\n

b. Budding: The bud is a small projection which gradually grows and gets detached from the parent cell and forms a new cell. The new cell grows, matures and produces more cells. For example, in yeast and Hydra.<\/p>\n

c. Fragmentation: In this mode of reproduction, the growth and multiplication is done by rapidly breaking down into two or more fragments. Each piece grows into new individual when water and nutrients are available. For example, algae.<\/p>\n

d. Spore formation: This reproduction is done by spores, which germinate under favourable conditions and develop into a new individual. For examples, mosses and ferns.<\/p>\n

Question 3.
\nExplain what you understand by sexual reproduction.
\nAnswer:
\nWhen two parents are involved in reproduction, it is called sexual reproduction. Formation of male and female gametes is the first step of sexual reproduction. The male and female gametes fuse during fertilisation to produce zygote. The zygote subsequently develops into an embryo which further develops into a new individual.<\/p>\n

Question 4.
\nState the main differences between asexual and sexual reproduction.
\nAnswer:<\/p>\n\n\n\n\n\n\n\n\n
Asexual Reproduction<\/td>\n\n

Sexual Reproduction<\/p>\n<\/td>\n<\/tr>\n

1. One parent is involved.<\/td>\n1. Two parents are involved.<\/td>\n<\/tr>\n
2. New generation is identical or true copy of their parent.<\/td>\n2. New born are similar to their parents with some variations.<\/td>\n<\/tr>\n
3. It doesn\u2019t require the formation of gametes.<\/td>\n3. It requires the formation of gametes.<\/td>\n<\/tr>\n
4. Special organs for reproduction are not required.<\/td>\n4. Special organs for reproduction are required.<\/td>\n<\/tr>\n
5. Examples: Potato, Jasmine, Rose, Yeast, Bryophyllum, etc.<\/td>\n5. Examples: Mangoes, coconut, Hibiscus, etc.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"NCERT<\/p>\n

Question 5.
\nSketch the reproductive parts of a flower.
\nAnswer:
\nStamen is the male while pistil is the female reproductive part of a flower.
\n\"NCERT<\/p>\n

Question 6.
\nExplain the difference between self-pollination and cross-pollination.
\nAnswer:<\/p>\n\n\n\n\n\n\n
Self pollination<\/td>\nCross Pollination<\/td>\n<\/tr>\n
1. It is the transfer of pollen grains from the stamen to the pistil of the same flower or another flower of the same plant.<\/td>\n1. It is the transfer of pollen grains from the stamen of one flower to the pistil of another flower of different plants of the same kind.<\/td>\n<\/tr>\n
2. External medium is not required.<\/td>\n2. External medium is required.<\/td>\n<\/tr>\n
3. It occurs only in bisexual flowers.<\/td>\n3. It occurs in both unisexual and bisexual flowers.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 7.
\nHow does the process of fertilisation take place in flowers?
\nAnswer:
\nWhen ripe pollen from an anther lands on the stigma of the same kind of flower, each pollen grain sends out a tiny thread-like tube. The tube grows down through the style and pierces one of the ovules in the ovary. This pollen tube carries a male gamete to meet the female gamete in the ovule. Two gametes fuse together to form zygote. The process of fusion of male and female gametes (to form a zygote) is called fertilisation. The zygote develops into an embryo.
\n\"NCERT<\/p>\n

Question 8.
\nDescribe the various ways by which seeds are dispersed.
\nAnswer:
\nFollowing are the various methods of seed dispersal:
\na. Dispersal by Wind: Seeds of some plants are light-weight or have hair-like or wing-like structures present on them. Such seeds float in air and are thus dispersed by wind. For example: Dandelion, maple, drumstick, etc.<\/p>\n

b. Dispersal by Water: Dispersal by water takes place in some aquatic plants and in some which grow near a water body. Seeds of water lily float and thus are dispersed by water. The coconut seed has a tough fibrous covering which has plenty of air inside. This helps the coconut seeds in floating on water.<\/p>\n

c. Dispersal by Animals: Some seeds have spine-like structures on them. They get stuck to the fur of animals and thus get spread to different places. For example: Beggar tick, Xanthium, Urena, etc. Some seeds are swallowed by birds and animals along with fruits. These seeds get dispersed with bird or animal droppings.<\/p>\n

d. Dispersal by Bursting: Some fruits burst open when they mature. The force of bursting is enough to spread the seeds. For example: ladyfinger, castor, balsam, etc.<\/p>\n

e. Dispersal by Humans: Human beings also help in dispersal of seeds, especially during farming.<\/p>\n

\"NCERT<\/p>\n

Question 9.
\nMatch the items in column I with those of column II<\/p>\n\n\n\n\n\n\n\n\n\n
Column I<\/td>\n\n

Column II<\/p>\n<\/td>\n<\/tr>\n

1. Bud<\/td>\n(a) Maple<\/td>\n<\/tr>\n
2. Eyes<\/td>\n(b) Spirogyra<\/td>\n<\/tr>\n
3. Fragmentation<\/td>\n(c) Yeast<\/td>\n<\/tr>\n
4. Wings<\/td>\n(d) Bread mould<\/td>\n<\/tr>\n
5. Spores<\/td>\n(e) Potato<\/td>\n<\/tr>\n
(f) Rose<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answer:
\n1. (c),
\n2. (e),
\n3. (b),
\n4. (a),
\n5. (d)<\/p>\n

Question 10.
\nTick the correct answer:
\na. The reproductive part of a plant is the
\n(i) leaf
\n(ii) stem
\n(iii) root
\n(iv) flower
\nAnswer:
\n(iv) flower<\/p>\n

b. The process of fusion of the male and the female gametes is called
\n(i) fertilisation
\n(ii) pollination
\n(iii) reproduction
\n(iv) seed formation
\nAnswer:
\n(i) fertilisation<\/p>\n

c. Mature ovary forms the
\n(i) seed
\n(ii) stamen
\n(iii) pistil
\n(iv) fruit
\nAnswer:
\n(iv) fruit<\/p>\n

d. A spore producing plant is
\n(i) rose
\n(ii) bread mould
\n(iii) potato
\n(iv) ginger
\nAnswer:
\n(ii) bread mould<\/p>\n

e. Bryophyllum can reproduce by its
\n(i) stem
\n(ii) leaves
\n(iii) roots
\n(iv) flower
\nAnswer:
\n(ii) leaves<\/p>\n

NCERT Extended Learning Activities and Projects<\/span><\/p>\n

Question 1.
\nMake your own garden by collecting pieces cut from different kinds of cacti. Grow the variety in one single flat container or in separate pots.
\nHint:
\nCactus can grow in scarcity of water and can withstand the absence of water for a long time. That is why, it can grow easily in the deserts. Thus, cactus can be grown quite easily in pots in home in single container or in separate pots.<\/p>\n

Question 2.
\nVisit a fruit market and collect as many local fruits as possible. If many fruits are not available, you can collect tomatoes and cucumber (these are fruits, though we use them as vegetables). Make drawings of the different fruits. Split the fruits and examine the seeds within. Look for any special characteristics in the fruit and their seeds. You can visit a library also to learn about this.
\nHint:
\nCollect the fruits and study the characteristics of fruits and seeds on your own.<\/p>\n

\"NCERT<\/p>\n

Question 3.
\nThink of ten different fruit-bearing plants. Remember that many vegetables are also fruits of the plants. Discuss with your teacher, parents, farmers, fruit growers and agricultural experts (if available nearby) and find out the manner of their dispersal. Present your data in the form of a table as shown below.<\/p>\n\n\n\n\n\n\n
S. No.<\/td>\nName of fruit bearing plant<\/td>\nAgent through which seeds are dispersed<\/td>\nPart of seed which helps in dispersal<\/td>\n<\/tr>\n
1.<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
2.<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
3.<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Hint:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
S. No.<\/td>\nName of fruit bearing plant<\/td>\nAgent through which seeds are dispersed<\/td>\nPart of seed which helps in dispersal<\/td>\n<\/tr>\n
1.<\/td>\nCoconut<\/td>\nWater<\/td>\nFibrous coating<\/td>\n<\/tr>\n
2.<\/td>\nLotus<\/td>\nWater<\/td>\nThalamus which floats in water<\/td>\n<\/tr>\n
3.<\/td>\nBalsam<\/td>\nSudden jerk<\/td>\nBursting pericarp<\/td>\n<\/tr>\n
4.<\/td>\nBanyan<\/td>\nBirds<\/td>\nStick to the beak of birds<\/td>\n<\/tr>\n
5.<\/td>\nOrchid<\/td>\nWind<\/td>\nLightness, minutes<\/td>\n<\/tr>\n
6.<\/td>\nCotton<\/td>\nWind<\/td>\nHair on seeds<\/td>\n<\/tr>\n
7.<\/td>\nSilk<\/td>\nWind<\/td>\nHair on seeds<\/td>\n<\/tr>\n
8.<\/td>\nTecoma<\/td>\nWind<\/td>\nWinged seeds<\/td>\n<\/tr>\n
9.<\/td>\nOxalis<\/td>\nAnimals<\/td>\nBarbs\/hooks<\/td>\n<\/tr>\n
10.<\/td>\nTiger\u2019s nail<\/td>\nAnimals<\/td>\nSeeds have hooks<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 4.
\nSuppose there is one member of a particular kind of organism in a culture dish, which doubles itself in one hour through asexual reproduction. Work out the number of members of that kind of organism which will be present in the culture dish after ten hours. Such a colony of individuals arising from one parent is called a \u201cclone\u201d.
\nHint:
\nThe answer will be 210<\/sup>, i.e., 1024. Hence, new colony will have 1024 members after 10 hours.<\/p>\n

Activity 1<\/span><\/p>\n

Objective: To observe tuber of a potato and grow new plants from potato tubers.
\nMaterials Required: A potato with buds or eyes and pot with soil in it.
\nProcedure:<\/p>\n