biology MCQs - 9th class Chapter 05 Mcqs

1

Which of the following is the smallest unit of matter that maintains the property of an element?

A

Molecule

B

Atom

C

Organelle

D

Cell

2

Mitochondria are specialized for cellular respiration, while ribosomes are specialized for what?

A

Energy storage

B

Protein synthesis

C

Cell division

D

Waste removal

3

Which tissue covers body surfaces and lines cavities like the skin?

A

Muscle tissue

B

Connective tissue

C

Nervous tissue

D

Epithelial tissue

4

What is the primary function of vascular tissue like xylem and phloem in plants?

A

Protection

B

Support

C

Photosynthesis

D

Transport of water and nutrients

5

Which of the following is an example of an organ system in plants?

A

Leaf

B

Root system

C

Flower

D

Xylem

6

New functions that arise from the interaction of components at a lower level are called what?

A

Basic properties

B

Complex properties

C

Emergent properties

D

Individual properties

7

The coordinated interaction of muscle, connective, and epithelial tissues allows which organ to pump blood?

A

Lungs

B

Liver

C

Heart

D

Brain

8

Which plant organ is primarily responsible for anchoring the plant and absorbing water?

A

Leaf

B

Stem

C

Flower

D

Roots

9

The loss of water vapour from leaves through small pores is known as?

A

Photosynthesis

B

Respiration

C

Transpiration

D

Absorption

10

What is the reproductive part of a plant?

A

Root

B

Stem

C

Leaf

D

Flower

11

The waxy cuticle on the upper epidermis of a leaf serves to?

A

Increase water absorption

B

Attract sunlight

C

Reduce water loss

D

Facilitate gas exchange

12

Which tissue in the leaf is the primary site of photosynthesis?

A

Epidermal tissue

B

Vascular tissue

C

Mesophyll tissue

D

Cuticle

13

Loosely arranged cells with air spaces for gas diffusion are characteristic of which tissue?

A

Palisade mesophyll

B

Spongy mesophyll

C

Upper epidermis

D

Xylem

14

The shoot system in plants includes stems, branches, leaves, and what else?

A

Roots

B

Soil

C

Flowers

D

Mycorrhizae

15

Which human organ is considered the control center of the body, responsible for thinking and decision-making?

A

Heart

B

Lungs

C

Brain

D

Liver

16

Which organ produces digestive enzymes like pepsinogen?

A

Liver

B

Pancreas

C

Stomach

D

Intestines

17

The epithelial tissue of the stomach is glandular in nature and secretes what?

A

Bile

B

Insulin

C

Mucus

D

Hormones

18

Hydrochloric acid in the stomach helps to activate which enzyme?

A

Lipase

B

Amylase

C

Pepsin

D

Trypsin

19

Which tissue lies beneath the epithelial tissue in the stomach and provides structural support?

A

Muscle tissue

B

Outer tissue

C

Connective tissue

D

Glandular tissue

20

The system responsible for the digestion of food and absorption of nutrients is the?

A

Respiratory System

B

Digestive System

C

Skeletal System

D

Muscular System

21

Which system includes bones, cartilages, and tendons, providing structure and protection?

A

Muscular System

B

Nervous System

C

Skeletal System

D

Circulatory System

22

The exchange of gases like oxygen and carbon dioxide between the body and environment is the function of which system?

A

Digestive System

B

Circulatory System

C

Respiratory System

D

Nervous System

23

The ability of an organism to maintain a stable internal environment is called?

A

Metabolism

B

Adaptation

C

Respiration

D

Homeostasis

24

When body temperature rises, what do sweat glands do?

A

Shiver

B

Contract

C

Secrete sweat

D

Close pores

25

If body temperature falls, muscles start to do what to generate heat?

A

Relax

B

Sweat

C

Shiver

D

Expand

26

When blood glucose levels rise, the pancreas releases which hormone?

A

Glucagon

B

Adrenaline

C

Thyroxine

D

Insulin

27

Which two systems regulate and coordinate activities like heart rate and respiration?

A

Skeletal and Muscular

B

Nervous and Endocrine

C

Digestive and Respiratory

D

Circulatory and Urinary

28

The sum of the parts is less than the whole' is a concept related to?

A

Levels of organization

B

Cell theory

C

Homeostasis

D

Emergent properties

29

Which of the following represents the correct level of organization from simplest to most complex?

A

Organelle -> Cell -> Tissue -> Organ

B

Cell -> Organelle -> Tissue -> Organ

C

Tissue -> Cell -> Organ -> Organelle

D

Organ -> Tissue -> Cell -> Organelle

30

Which plant tissue consists of tightly packed elongated cells located just beneath the upper epidermis?

A

Spongy mesophyll

B

Vascular tissue

C

Palisade mesophyll

D

Lower epidermis

31

The heart, arteries, veins, and capillaries are all parts of which system?

A

Nervous System

B

Respiratory System

C

Blood Circulatory System

D

Digestive System

32

Which organ is responsible for filtering waste products from the blood and producing urine?

A

Liver

B

Stomach

C

Lungs

D

Kidneys

33

Which organ performs vital functions including filtering blood, producing bile, and storing glucose?

A

Pancreas

B

Kidneys

C

Heart

D

Liver

34

The smooth muscles of the stomach contract and relax to?

A

Protect the stomach lining

B

Absorb nutrients

C

Mix food with gastric juice

D

Secrete acid

35

In a leaf, which tissue is responsible for photosynthesis?

A

Xylem

B

Mesophyll

C

Epidermis

D

Phloem

36

At which level of organization does gas exchange occur between the body and the environment?

A

Organelle level

B

Cellular level

C

Tissue level

D

Organ system level

37

The epithelial tissue in the stomach wall is responsible for producing:

A

Mucus

B

Pepsinogen

C

Hydrochloric acid

D

All of these

38

In the wall of the stomach, which tissue also contains blood vessels and nerves?

A

Epithelial

B

Muscle

C

Inner connective

D

Outer connective

39

What is the primary function of the xylem tissue in a leaf?

A

To transport sugars to other parts

B

To transport water to parts of leaf

C

To synthesize chlorophyll

D

To control the opening and closing of stomata

40

Which of these is a function of the human skeletal system?

A

Storing minerals and producing blood cells

B

Removing carbon dioxide from blood

C

Filtering blood to remove waste products

D

Breaking down food for energy

41

Which structures are responsible for the transport of food in the plant body?

A

Xylem tissue

B

Palisade mesophyll

C

Phloem tissue

D

Spongy mesophyll

42

In a plant, which of the following is the primary function of the flower?

A

Transporting water and minerals

B

Supporting leaf growth

C

Facilitating reproduction through pollination

D

Regulating gas exchange

43

Which system acts as a barrier to protect the body from external factors?

A

Urinary system

B

Nervous system

C

Integumentary system

D

Endocrine system

44

Unicellular organisms are made of how many cells?

A

One

B

Two

C

Many

D

Hundreds

45

What do molecules combine to form?

A

Atoms

B

Organelles

C

Tissues

D

Organs

46

Which system eliminates waste materials and regulates water and salt balance?

A

Digestive system

B

Urinary system

C

Respiratory system

D

Cardiovascular system

47

The digestive system is composed of the mouth, oesophagus, stomach, intestines, and?

A

Brain

B

Lungs

C

Liver

D

Kidneys

48

A group of similar cells that work together to perform one or more specific functions is called?

A

An organ

B

An organelle

C

A tissue

D

A system

49

Stomata, which control gas exchange, are tiny pores found between which cells?

A

Epidermal cells

B

Guard cells

C

Mesophyll cells

D

Xylem cells

50

In which part of the leaf is the vascular tissue located?

A

Cuticle

B

Air spaces

C

Midrib and veins

D

Guard cells