Case Study Questions Class 7 Science Chapter 12 Reproduction in Plants
CBSE Class 7 Case Study Questions Science Reproduction in Plants. Important Case Study Questions for Class 7 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Reproduction in Plants.
At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.
CBSE Case Study Questions Class 7 Science Reproduction in Plants
Case study 1
The productionof new individuals from their parents isknown as reproduction. Most plants haveroots, stems and leaves. These are calledthe vegetative parts of a plant. After acertain period of growth, most plantsbear flowers. You may have seen themango trees flowering in spring. It isthese flowers that give rise to juicymango fruit we enjoy in summer. We eatthe fruits and usually discard the seeds.Seeds germinate and form new plants.Flowers perform the function ofreproduction in plants. Flowers are thereproductive parts.
There are several ways by whichplants produce their offspring. These arecategorized into two types: (i) asexual,and (ii) sexual reproduction. In asexualreproduction plants can give rise to newplants without seeds, whereas in sexual reproduction, new plants are obtainedfrom seeds.
Que. 1) The production of new individual due to the fusion of male and female gamete is known as………………………………………………………………….………………….
(a) Asexual reproduction
(b) Sexual reproduction
(c) Reproduction
(d) Germination
Que. 2) Which of the following is a part of the plant?
(a) Stem
(b) Root
(c) Leaves
(d) All of the above
Que. 3) In……………………………………………………………………………………….reproduction plants can give rise to new individuals without fertilization.
(a) Asexual reproduction
(b) Apomixis
(c) Parthenocarpy
(d) Vegetative propagation
Que. 4) Which part is involved in the reproduction of plants?
Que. 5) Name the vegetative parts of plants?
Answer Key
Que. 1)(b) Sexual reproduction
Que. 2) (d) All of the above
Que. 3) (a) Asexual reproduction
Que. 4) Answer: Flower is the part of the plant which is involved in reproduction.
Que. 5) Answer: Root, stem and leaves are the vegetative parts of the plant.
Case study 2
Stamens are the male reproductive partand pistil is the female reproductive part. Flowers which contain either onlypistil or only stamens are calledunisexual flowers. Flowers whichcontain both stamens and pistil arecalled bisexual flowers. Corn, papayaand cucumber produce unisexualflowers, whereas mustard, rose andpetunia have bisexual flowers. Both male and female unisexual flowers maybe present in the same plant or indifferent plants.Anther contains pollen grains whichproduce male gametes. A pistil consistsof stigma, style and ovary. Ovarycontains one or more ovules. The
Female gamete or the egg is formed inan ovule. In sexualreproduction a male and a femalegamete fuse to form a zygote.
Que. 1) Pistil is the……………………………………………….………………..reproductive part and stamen is the…………………………………………………………………….….reproductive part of flower.
(a) Female, male
(b) Male, female
(c) Male, male
(d) Male, ovule
Que. 2) Papaya produces which type of flowers?
(a) Hermaphrodite
(b) Unisexual
(c) Bisexual
(d) No flower
Que. 3) Where is female gamete formed?
(a) Stamen
(b) Pistil
(c) Ovule
(d) Ovum
Que. 4) How a zygote is formed in sexual reproduction?
Que. 5) What is the composition of pistil?
Answer Key
Que. 1)(a) Female, male
Que. 2) (b) Unisexual
Que. 3) (c) Ovule
Que. 4) Answer: The zygote is formed due to the fusion of male and female gamete in sexual reproduction.
Que. 5) Answer: Pistil consist of stigma, style and ovary.
Case study 3
Generally, pollen grains have a toughprotective coat which prevents themfrom drying up. Since pollen grains arelight, they can be carried by wind or water. Insects visit flowers and carryaway pollen on their bodies. Some ofthe pollen lands on the stigma of a flowerof the same kind. The transfer of pollenfrom the anther to the stigma of a floweris called pollination. If the pollen landson the stigma of the same flower oranother flower of the same plant, it iscalled self-pollination.
When the pollenof a flower lands on the stigma of a flowerof a different plant of the same kind, it is called cross pollination the cell which results after fusion ofthe gametes is called a zygote. Theprocess of fusion of male and female gametes (to form a zygote) is calledfertilization. The zygote develops into an embryo.
Que. 1) Pollen grains have a……………………………………………………….……………protective coat which prevents the pollen grain form……………………………………………………..………………………………..
(a) Tough, drying up
(b) Soft, drying up
(c) Flexible, drying up
(d) Strong, moisture
Que. 2) What develops into an embryo?
(a) Pollen
(b) Ovum
(c) Zygote
(d) Pistil
Que. 3) Which of the following acts as an agent for pollination?
(a) Insect
(b) Water
(c) Wind
(d) All of the above
Que. 4) Define pollination?
Que. 5) How many types of pollination are there, name them?
Answer Key
Que. 1)(a) Tough, drying up
Que. 2) (c) Zygote
Que. 3) (d) All of the above
Que. 4) Answer: The transfer of pollen grains form anther to the stigma of a flower is called as pollination.
Que. 5) Answer: There are mainly 2 types of pollination which are self and cross pollination.
Case study 4
After fertilization, the ovary grows intoa fruit and other parts of the flower falloff. The fruit is the ripened ovary. Theseeds develop from the ovules. The seedcontains an embryo enclosed in aprotective seed coat.Some fruits are fleshy and juicy suchas mango and orange. Some fruits arehard like almonds and walnuts in nature same kind of plants grow atdifferent places. This happens becauseseeds are dispersed to different places.Sometimes after a walk through a forestor a field or a park, you may have foundseeds or fruits sticking to your clothes.
If allseeds of a plant were to fall at the sameplace and grow then. There would besevere competition for sunlight, water,minerals and space. As a result the seedswould not grow into healthy plants.Plants benefit by seed dispersal. Itprevents competition between the plantand its own seedlings for sunlight, waterand minerals. It also enables the plantsto invade new habitats for widerdistribution.
Que. 1) After fertilization the ovary develops into……………………………………………………………….………………………..and the other parts of the flower fall off.
(a) Fruit
(b) Seed
(c) Ovule
(d) Clothes
Que. 2) The embryo is protected by a…………………………………………………………………………………………….
(a) Seed coat
(b) Weather coat
(c) Ovule
(d) None
Que. 3) Which fruit is fleshy and juicy?
(a) Mango
(b) Banana
(c) Almond
(d) Tomato
Que. 4) What is a fruit?
Que. 5) If all seeds of the plant will fall off and grow then what would happened?
Answer Key
Que. 1)(a) Fruit
Que. 2) (a) Seed coat
Que. 3) (a) Mango
Que. 4) Answer: When the ovary is ripened it is called as fruit
Que. 5) Answer: If all the seeds of the plant fall of at the same time then it would create competition for sunlight, nutrients, water and space.
Case study 5
Seeds and fruits of plants are carriedaway by wind, water and animals.Winged seeds such as those of drumstick and maple, light seeds of grasses or hairy seeds of aak(Madar) and hairy fruit of sunflower, get blown off withthe wind to faraway places. Some seedsare dispersed by water. These fruits orseeds usually develop floating ability inthe form of spongy or fibrous outer coatas in coconut. Some seeds are dispersedby animals, especially spiny seeds withhooks which get attached to the bodiesof animals and are carried to distantplaces. Examples are Xanthium and Urena.Some seeds are dispersed when thefruits burst with sudden jerks. The seedsare scattered far from the parent plant.This happens in the case of castor andbalsam.
Que. 1) Which fruit have the ability to float?
(a) Coconut
(b) Mango
(c) Papaya
(d) None
Que. 2) Seeds and fruits of plants are carried away by which of the following factors?
(a) Wind
(b) Water
(c) Animal
(d) All
Que. 3) ……………………………………………………………………………..………types of seeds are dispersed by animals.
(a) Spiny seeds
(b) Spongy seeds
(c) Soft seeds
(d) Hard seeds
Que. 4) Winged seeds are transported to faraway places by winds is it true or false?
Que. 5) Which type of seed or fruit develop floating abilities?
Answer Key
Que. 1)(a) Coconut
Que. 2) (d) All
Que. 3) (a) Spiny seeds
Que. 4) Answer:The statementwinged seeds are transported to faraway places by wind is true.
Que. 5) Answer:The seeds which are transported by water generally develops floating abilities.
Very helpful thank you
Very useful for me ☺️
Very helpful thank you
I study in ICSE BOARD BUT THIS IS VERY HELPFUL
I REALLY HOPE THEY HELP MORE IN STUDIES
THANKING YOU
ARADHYA BACHACHAN