Class 5th science written work Ch 1 Growth and development in Plants


Date 24 April,2021

Day: Saturday

Ch 1 Growth and development in Plants

Give short answer to the following

 Q1. What is germination?

Ans: the process of converting a seed into seedling.

Q2.  what are the necessary conditions for seed to germinate?

Ans:  Temperature, moisture, air, and light conditions must be correct for seeds to germinate.

Q3. what is the role of cotyledons in the growth of a seedling

Ans: Cotyledons function to provide the initial growth for the plant and as an energy source.

Q4. what is vegetative reproduction?

Ans: Vegetative reproduction is a method wherein new plants are produced by vegatative parts of a plant called propagules. The vegetative parts mean the leaf, stem and root. 

Q5. How does soil affect the growth of the plant?

Ans: Plants growth is greatly affected by the type of soil. different types of soil suitable for different kinds of plants. for example black soil is suitable for cotton plants.

Answer the following question

Q1. Name the different parts of the seed. Support your answer with diagram.
Ans: Parts of the seed
1. Seed coat: The outer hard covering of the seed.
2. Embryo: Tiny plant inside the seeed.
3. Cotyledon: Fleshy part of the seed which provide food to the embryo.

Q2. State the three main ways by which new plant can be grown.
Ans: Method of growing new plant:
1. A new plant can be grown from the seed of the plant.
2. Plants like rose can be grown from the stem.
3. Bryophyllum can be grown from the leaf.
4. Mint and potato can be grown from the root of the plant.

Q3. Which factors affect the growth and development of the plant. Explain briefly.
Ans: The following factors affect the growth and development of the plant
1. Soil: Different kind of soil is suitable for different kind of crops. For example black soil is suitable for growing cotton.
2. Climate: A single kind of climate is not suitable for all kinds of plant. For example, cactus grows in desert whereas coconut tree grow in coastal areas.
3. Season: Some plants are seasonal. For example, wheat is a winter (rabi) crop.

Q4. Give five tips for better crop yield.
Ans: 1. Use healthy and better quality of seeds for sowing
2. Prepare the land value before sowing
3. Add manures and fertilizers to the soil
4. Irrigate the plants properly.
5. Remove weeds from the crop
6. Use insecticides and pesticides to keep the crop pest free

Q5. What is seed dispersal? Name the agents of seed dispersal.
Ans: The process of scattering seeds away from the mother plant is called seed dispersal.
wind, water, animals and fruit explosions are the methods of seed dispersal.



Comments

Post a Comment

Popular posts from this blog

Class 9th Science Ch 2 Revision Notes on Is matter around us Pure

Image
  Revision Notes on Is matter around us Pure What is a substance? Anything that cannot be broken into further particles by applying any physical processes is called a  Substance . Matter can be classified into two types of substances – Pure substances and Mixtures What is a pure substance? A substance that consists of only one type of particle is called a  Pure Substance .  For Example , Diamond, Salt, Sulfur, Tin.  What is a mixture? When we combine different substances into each other a mixture is formed.  For Example , Lemonade is a mixture of three substances, Lemon Juice, Sugar and Water. Which of these is a mixture or a pure substance? Water, Copper, Chocolate cake, Hydrogen, Soil, Air Mixture – Chocolate cake, Soil, Air Pure substance – Water, Copper, Hydrogen Types of Mixtures There are two categories of mixtures: Homogeneous Mixtures and Heterogeneous Mixtures Homogenous Mixtures When we add sugar, water and lemon juice together they all uniformly mix with each other. Now it i
Read more

Class 6th Ch 5 Separation of substances Written work

  Exercise Questions 1. Why do we need to separate different components of a mixture? Give two examples. Solution: When two or more substances are mixed together they form a mixture. Components of a mixture should be separated because some components may not be useful or may spoil the useful component of the mixture. Examples: Tea leaves are separated from the liquid with a strainer, while preparing tea Removal of stone pieces from wheat, rice or pulses by hand 2. What is winnowing? Where is it used? Solution: The method of separating the components from a mixture is known as winnowing. In this method, heavier and lighter components of a mixture are separated by wind or by blowing air. This method is used by farmers to separate lighter husk particles from heavier seeds of  grain. 3. How will you separate husk or dirt particles from a given sample of pulses before cooking? Solution: Husk and dirt particles are separated from pulses by winnowing. 4. What is sieving? Where is it used? Sol
Read more