31.

First time bacteria were observed by

• Antony Von Leeuwenhoek

• Louis Pasteur

• Robert Hook

• None of the above

Silicious cell-wall is present in

• blue-green algae

• diatoms

• fungi

• bacteria

Identify false statement.

• Frog can respire both through lungs and skin

• Bile juice is secreted by liver

• During inhalation volume of thoracic cavity is increased

• Microsporum is a pathogenic bacteria

Identify the wrong match

• Sleeping sickness- Trypanosoma

• Amoebic dysentry-Entamoeba

• Chicken pox- Bacteria

• Malaria- Plasmodium

In the alimentary canal, the swallowed food moves downwards because of

• the contraction of muscles in the wall of food pipe

• the flow of fluid material taken with the food

• gravitational pull

• force provided by the muscular tongue

Frogs and earthworms breathe through their skin because of which the skin of both the organisms is

• dry and rough

• dry and slimy

• moist and rough

• moist and slimy

While going for a picnic a student noted the reading on the odometer on the bus after every 10 min till the end of the journey. Later on, he recorded the reading in a table shown below

Time (am)	Odometer Reading
8:00	78752
8:10	78758
8:20	78768
8:30	78780
8:40	78791
8:50	78800
9:00	78806

The average speed of the bus in the entire journey (in m/s) was

• 15

• 18

• 30

• 54

Which of the following statements is true about endemic species?

• They are not affected by the destruction of their habitat

• They are found only in zoos and botanical gardens

• They are found exclusively in specific habitat

• Endemic species can never become endangered

Which of the following pairs is related to the inheritance of characters?

• Chromosomes and genes

• Chromosomes and mitochondria

• Cell membrane and cell wall

• Cell membrane and chloroplast

Out of the different combinations of terms given below, the correct combination of terms with reference to an animal cell is

• nucleus, plastid, cell membrane, cell wall

• nucleus, chromosome, ribosome, cell wall

• cell membrane, chromosome, ribosome, mitochondria

• cell membrane, ribosome, chloroplast, mitochondria