Adding salt and sugar to food substances helps in preserving them for a longer duration. It is because excess salt and sugar

• cause rupturing of microbial cells

• cause change in the shape of microbial cells

• remove water from food

• plasmolyse the microbial cells

2.

Root cap is absent in

• hydrophytes

• mesophytes

• halophytes

• xerophytes

While teaching the concept, 'force can change the shape of an object' to students, a teacher plans the following activities
A. Explain concepts using commonly observed examples.
B. Provide a dough on a plate and ask the students to press it down with the hand.
C. Show an audio-visual film explaining the concept with some examples.

The teacher is using different approaches to learning because

• she knows she must follow her lesson plan

• she wants to prepare students for a test

• there are different kinds of learners in the class and she wants to address multiple intelligences

• she wants to prove her knowledge

Ms Patel, Principal of a School XYZ, is keen about integrated approach to teaching of Science rather than teaching different disciplines separately. The basis of this is

• difficulty to adjust the teachers in the time-table

• difficulty of students to adjust to different teachers

• all the disciplines are interlinked and a teacher can draw on cross-curricular linkages

• non-availability of qualified teachers in her school to teach separate disciplines

A man goes door to door posing as a goldsmith. He promises to bring back the glitter on dull gold ornaments. An unsuspecting woman gives a set of gold bangles to him which he dips in a particular solution. The bangles sparkle but their weight has considerably reduced. The solution used by the impostor probably is

• conc. HCl

• a mixture of conc. HCl and conc. HNO₃

• conc. HNO₃

• dil. HCl

A teacher plans to teach 'Components of Food' in Class-VI. Which of the following can be used as an essential question?

• Why does your mother serve you a meal with a variety of food items?

• Does your mother prepare a definite set of food items for lunch every day?

• Do you eat all the items served in your lunch every day?

• List the food items your mother serves you in lunch

When an iron nail is dipped in copper sulphate solution, the colour of copper sulphate solution fades and a brownish layer is deposited over the iron nail. This is an example of

• decomposition reaction

• double displacement reaction

• displacement and redox reactions

• combination reaction

Bleeding is stopped by the application of alum to a wound because

• alum coagulates the blood and forms a clot

• alum reduces the temperature near the wound

• alum is an antiseptic

• the wound is plugged by the alum chunk

Which of the following can be assessed when Geeta is using only MCQ as a tool to assess "Nutrition in Humans"?

• Misconceptions related to food habits

• Learner's ability to apply knowledge and prepare a role-play to present in the morning assembly

• Learners' ability to comprehend the importance of components of food and write a long essay

• Analytical ability to classify food items and make a poster

In which of the following cases of motion, are the distance moved and the magnitude of displacement equal?

• A car moving in a circular path

• A pendulum oscillating to and fro

• The Earth revolving around the Sun

• A car moving on a straight road