Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bff59b460d7261f34f.PNG' /> In the above figure, an activity is shown. Collect a few small plastic or rubber caps of discarded bottles and clean them. Pour one teaspoon of lemon juice or vinegar in one cap. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in figure. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. Does the bulb of the tester glow?

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bef59b460d7261f34e.PNG' /> In the above figure, an activity is shown. Collect a few small plastic or rubber caps of discarded bottles and clean them. Pour one teaspoon of lemon juice or vinegar in one cap. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in figure. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. Does lemon juice or vinegar conduct electricity?

Question 5 :
Most liquids that do not conduct electricity are solutions of acids, bases and salts. TRUE or FALSE?

Question 6 :
Animals whose numbers are diminishing to a level that they might face extinction are known as the ________ ?

Question 7 :
Removal of the top layer of the soil exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. Gradually the fertile land gets converted into deserts. It is called __________?

Question 8 :
Which of the following feature is correct for a wildlife sanctuary?

Question 9 :
A place reserved for wild life where they can freely use the habitats and natural resources is known as?

Question 10 :
Which one of the following statements is true about endemic species?

Question 11 :
Why do migratory birds fly to far away areas every year during a particular time?

Question 12 :
State true or false. There can be a wildlife sanctuary within a biosphere reserve.

Question 13 :
Do Migratory birds fly for laying eggs as the weather in their natural habitat becomes very cold and inhospitable?

Question 15 :
__________ is restocking of the destroyed forests by planting new trees.

Question 17 :
Choose the correct word for the given clue. Clue - Pancreatic hormone

Question 18 :
Out of the following, which is the correct match for Endocrine gland attached to brain

Question 23 :
Stages in the life cycle of silkworm are given below. Write them in sequential order. Pupa, Silkworm, Egg, Silkmoth.

Question 24 :
State the following statement True or False:- The transformation of the larva into an adult through drastic changes is called metamorphosis.

Question 25 :
The embryo gets embedded in the wall of the ___________ for further development, in Fertilisation.