Class 7 Science Chapter 12 Reproduction in Plants

  Class 7 Science Chapter 12 Reproduction in Plants

Class 7 Science Chapter 12 Reproduction in Plants Question & Answers [ncert solutions for class 7 science chapter 12 question answer]

Q1 : Fill in the blanks:

  1. Production of new individuals from the vegetative part of parent is called ________.
  2. A flower may have either male or female reproductive parts. Such a flower is called _________.
  3. 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 _________.
  4. The fusion of male and female gametes is termed as __________.
  5. Seed dispersal takes place by means of _________, _________ and _________.

Answers-

  1. vegetative propagation
  2. unisexual
  3. pollination
  4. fertilisation
  5. wind,water,animals

 

Q2 : Describe the different methods of asexual reproduction. Give examples.

Plants reproduce asexually in the following ways:

A plant can reproduce new plants from its roots, stems, leaves, and buds. Vegetative propagation is divided into two types.

Vegetative propagation occurs naturally and involves simple vegetative parts. Potato plant sprouting from a potato eye is an example.

Budding The small bulb-like projection coming out from the yeast cell is called a bud. The bud gradually grows and gets detached from the parent cell and forms a new yeast cell.it is observed in yeast.

Fragmentation  is a form of asexual reproduction where a new organism is formed from fragments of the parent organism. Spirogyra reproduces only asexually.

Spore formation Many non-flowering plants reproduce by spores. Spores are small cells covered in a thick wall. Fungi such as bread moulds reproduce asexually using this method.

 

Q3 :Explain what you understand by sexual reproduction.

Seeds are produced during sexual reproduction. It Needs two parents. Flowers help plants reproduce sexually. A flower’s most significant function is reproduction, so that it can produce seeds that can grow new plants.

 

Q4 : State the main difference between asexual and sexual reproduction.

Differences between sexual and asexual reproduction:

Asexual reproduction occurs when only one parent can create offspring without the formation of gametes. They are truly the same as their parents. There is no special need for reproductive organs.

Two parents are involved in sexual reproduction, both male and female. In this type of reproduction, the gametes are needed to produce the new generation. Characteristics of both their parents can be passed on to the next generation.

 

Q5 :Explain the difference between self-pollination and cross-pollination.

Differences between self-pollination and cross-pollination:

If the pollen lands on the stigma of the same flower or another flower of the same plant, it is called self-pollination. 

When the pollen of a flower lands on the stigma of a flower of a different plant of the same kind, it is called cross-pollination

 

Q6 : How does the process of fertilizations take place in flowers?

The cell that results from the fusion of two gametes is called a zygote. The process of fusion of male and female gametes is called fertilisation The zygote develops into an embryo.

After fertilisation, the ovary grows into a fruit and other parts of the flower fall off. The fruit is the ripened ovary. The seeds develop from the ovules. The seed contains an embryo enclosed in a protective seed coat. 

 

Q7 : Describe the various ways by which seeds are dispersed.

Below are the methods by which seeds are dispersed.

Dispersal by animals – Seeds can be dispersed in many ways by birds and animals.

Animals and birds can consume fruits and excrete seeds from the parent plant.

Dispersal by wind – Seeds that get dispersed by wind are usually of a smaller size, or they have wings or hairs that support their mobility. For example, winged seeds of drumsticks, sunflower. 

Dispersal by water – A lot of aquatic plants or plants that live near water have seeds that can float and are carried away by the water. For example, coconuts 

Dispersion by explosion Some seeds are dispersed by cracking or breaking, Fruits that jerk suddenly. Seeds are scattered or dispersed far away from the mother plant. Examples – castor 

 

Q8 : 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

Q9 : Tick ( Å¡ ) the correct answer:

(a) The reproductive part of a plant is the

  • leaf
  • stem
  • root
  • flower 

(b) The process of fusion of the male and female gametes is called

  • fertilisation 
  • pollination
  • reproduction
  • seed formation

(c) Mature ovary forms the

  • seed
  • stamen
  • pistil
  • fruit 

(d) A spore producing plant is

  • rose
  • bread mould 
  • potato
  • ginger

(e) Bryophyllum can reproduce by its

  • stem
  • leaves 
  • roots
  • flower

MCQ  on Class 7 on Reproduction in Plants.

Also Read –

 

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