Yeast produces a small amount of alcohol during its growth, which gives the dough a slightly different smell.
  • True
  • False
Write your prediction for the change in the appearance of milk in Bowl A.
  • The milk in Bowl A will thicken and form curd due to the warm conditions.
  • The milk in Bowl A will turn blue due to the warm conditions.
  • The milk in Bowl A will evaporate completely due to the warm conditions.
  • The milk in Bowl A will freeze due to the warm conditions.
Write your prediction for the change in the appearance of milk in Bowl B.
  • The milk in Bowl B will remain mostly unchanged or take longer to form curd due to the cold conditions.
  • The milk in Bowl B will immediately turn into curd due to the cold conditions.
  • The milk in Bowl B will boil and evaporate quickly.
  • The milk in Bowl B will change color to blue due to the cold conditions.
Write your prediction for the change in the colour of milk in Bowl A.
  • The colour of milk in Bowl A may become slightly off-white as curd forms.
  • The colour of milk in Bowl A will turn bright red.
  • The colour of milk in Bowl A will become completely transparent.
  • The colour of milk in Bowl A will turn dark green.
Write your prediction for the change in the colour of milk in Bowl B.
  • The colour of milk in Bowl B will remain unchanged.
  • The colour of milk in Bowl B will turn blue.
  • The colour of milk in Bowl B will turn green.
  • The colour of milk in Bowl B will turn yellow.
Fill in the blank: The bacterium that helps turn milk into curd is ___________.
  • Lactobacillus
  • Escherichia coli
  • Staphylococcus
  • Bacillus subtilis
The function of Rhizobium bacteria in legume plants is:
  • To fix atmospheric nitrogen into a usable form for the plant
  • To absorb water from the soil
  • To produce glucose through photosynthesis
  • To protect the plant from insect pests
Read the passage below: Microalgae are microscopic plant-like organisms that live in water, soil, air, and even on trees. They make their own food using sunlight. While doing this, they also release oxygen and produce more than half of the Earth’s oxygen supply. They are rich in nutrients and serve as a food source for many aquatic animals. Some, like Spirulina, Chlorella, and Diatoms, are also used by humans as health supplements and medicines. Microalgae also help in cleaning water and are used to make biofuel.
  • Producing oxygen
  • Serving as food for aquatic animals
  • Making biofuel
  • Producing alcohol
Fill in the blank: Microalgae produce more than _______ of the Earth's oxygen supply.
  • half
  • quarter
  • one-tenth
  • one-third
It is important to conserve microalgae to maintain oxygen balance on Earth.
  • True
  • False
Which plant root nodules contain Rhizobium bacteria?
  • Wheat
  • Beans
  • Rice
  • Maize
What is Spirulina rich in?
  • Protein
  • Carbohydrates
  • Vitamin C
  • Fat
Spirulina is a good source of which vitamin?
  • Vitamin C
  • Vitamin B12
  • Vitamin D
  • Vitamin A
Ever heard of Spirulina? Spirulina, a microalga, is called a superfood because of its health benefits. Spirulina is also a good source of vitamin B12, which is essential for our body. It is rich in protein—more than 60 per cent of its body weight—and only a small amount of fat and sugar. Which of the following is NOT a benefit of Spirulina?
  • High protein content
  • High fat content
  • Good source of vitamin B12
  • Low sugar content
Which step involves adding living Spirulina collected from a pond?
  • Step 4
  • Step 1
  • Step 2
  • Step 3
Why Is Cell Considered to Be a Basic Unit of Life? The body of all living organisms are made up of tiny building blocks called cells. A single cell contains various components that help organisms perform various functions. The bodies of all plants and animals are made up of many cells. Therefore, they are called multicellular (many-celled) organisms. In multicellular organisms, cells carry out specialised functions individually but also cooperate with each other to increase the chance of survival. What are organisms made up of many cells called?
  • Multicellular organisms
  • Unicellular organisms
  • Protozoa
  • Viruses
Why Is Cell Considered to Be a Basic Unit of Life? Some microorganisms, such as bacteria and protozoa, are made up of just one cell. These are called unicellular (single-celled) organisms. They carry out all the functions necessary for their survival in a single cell. Which of the following is a unicellular organism?
  • Yeast
  • Mould
  • Algae
  • Fungi
Why Is Cell Considered to Be a Basic Unit of Life? Other microbes, like algae and fungi, are made up of one or more cells. For example, yeast is a unicellular fungus while mould is a multicellular fungus. Is mould a unicellular or multicellular fungus?
  • Multicellular fungus
  • Unicellular fungus
  • Neither unicellular nor multicellular
  • Both unicellular and multicellular
Why Is Cell Considered to Be a Basic Unit of Life? The body of all living organisms are made up of tiny building blocks called cells. A single cell contains various components that help organisms perform various functions. The bodies of all plants and animals are made up of many cells. Therefore, they are called multicellular (many-celled) organisms. In multicellular organisms, cells carry out specialised functions individually but also cooperate with each other to increase the chance of survival. True or False: In multicellular organisms, cells cooperate with each other to increase the chance of survival.
  • True
  • False
Microorganisms are ______-sized organisms and are not visible to the unaided eye.
  • small
  • large
  • medium
  • giant
Microorganisms can live in all kinds of environments, and even in the bodies of ______ and animals.
  • plants
  • rocks
  • machines
  • clouds
Bacteria and protozoans are ______; fungi can be unicellular or multicellular, while plants and animals are multicellular.
  • unicellular
  • multicellular
  • photosynthetic
  • heterotrophic
The cell is a basic unit of ______.
  • life
  • water
  • energy
  • matter
The body of all living organisms is made up of ______. A cell contains various components which help the organisms perform their functions and survive.
  • cells
  • bones
  • organs
  • tissues
A typical cell is bounded by a cell membrane, filled with cytoplasm and contains a ______. Plant, fungal, and bacterial cells have an extra covering, called a cell wall, around the cell membrane. Bacteria lack a well-defined nucleus.
  • nucleus
  • mitochondria
  • chloroplast
  • ribosome
Cells differ in shape and size. Their shape is related to the ______ performed by them.
  • function
  • location
  • color
  • age
Bacteria, fungi, and protozoa are different kinds of ______.
  • microorganisms
  • plants
  • minerals
  • animals
Viruses are also small in size, but they are different from other microorganisms since they reproduce only inside the ______ host organism.
  • host
  • cell
  • environment
  • tissue
Various parts of a cell are given below. Write them in the appropriate places in the following diagram.
  • Nucleus, Chloroplast, Cell membrane, Cytoplasm, Cell wall, Nucleoid (to be placed in the correct locations in the cell diagram)
  • Nucleus, Mitochondria, Cell membrane, Cytoplasm, Cell wall, Ribosome (to be placed in the correct locations in the cell diagram)
  • Nucleus, Chloroplast, Cell membrane, Cytoplasm, Cell wall, Endoplasmic reticulum (to be placed in the correct locations in the cell diagram)
  • Nucleus, Chloroplast, Cell membrane, Cytoplasm, Cell wall, Golgi apparatus (to be placed in the correct locations in the cell diagram)
Aanandi took two test tubes and marked them A and B. She put two spoonfuls of sugar solution in each of the test tubes. In test tube B, she added a spoonful of yeast. Then she attached two incompletely inflated balloons to the mouth of each test tube. She kept the set-up in a warm place, away from sunlight. What do you predict will happen after 3–4 hours? She observed that the balloon attached to test tube B was inflated. What can be a possible explanation for this?
  • Water evaporated in test tube B and filled the balloon with the water vapour.
  • The warm atmosphere expanded the air inside the test tube B, which inflated the balloon.
  • Yeast produced a gas inside the test tube B which inflated the balloon.
  • Sugar reacted with warm air, which produced gas, eventually inflating the balloon.
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