Test: Introduction To Respiration

QUESTION: 1

In which group of the organisms listed below, food material is broken down outside the body and absorbed ?

A.
Tapeworm, Amoeba, Paramecium
B.
Cuscuta, Mosquito, Tapeworm
C.
Mushroom, Rhizopus, Green plants
D.
Rhizopus, Mushroom, Yeast

Solution:

This is because these are sphrophytic organisms which breakdown food into simpler form outside their body.

QUESTION: 2

The opening and closing of the stomatal pore depends upon

A.
oxygen
B.
temperature
C.
concentration of CO₂ in stomata
D.
water in guard cells

Solution:

Stomata are the tiny pores present at the leaf surface. Each stomatal pore is surrounded by two guard cells that assist in stomatal opening driven by turgidity of guard cells. When water flows in guard cells from epidermal cells, guard cells become turgid and stomata are opened. Removal of water from guard cells makes them flaccid and stomata are closed.

QUESTION: 3

Movement of food through the oesophagus is due to :

A.
lubrication by saliva
B.
peristalsis
C.
diffusion
D.
turgor pressure

Solution:

Peristalsis is the rythmic contraction and relaxation of muscles of alimentary canal that propels the food in downward direction.

QUESTION: 4

Oxygen liberated during photosynthesis comes from

A.
glucose
B.
chlorophyll
C.
carbon dioxide
D.
water

Solution:

Oxygen liberated during photosynthesis comes from split water molecules. During photosynthesis, plants absorb water and carbon dioxide. After the absorption the wate,r molecules are disassembled and convert into sugar and oxygen.

QUESTION: 5

Oxygen released during photosynthesis is derived from

A.
water
B.
carbon dioxide
C.
glucose .
D.
chlorophyll

Solution:

water

QUESTION: 6

The filtration units of kidneys are called

A.
ureter
B.
urethra
C.
neurons
D.
nephrons

Solution:

Each of your kidneys is made up of about a million filtering units called nephrons. Each nephron includes a filter, called the glomerulus, and a tubule.

QUESTION: 7

The common step between aerobic and anaerobic respiration takes place in :

A.
chloroplast
B.
mitochondria
C.
cytoplasm
D.
golgi complex

Solution:

The first step of aerobic respiration as well as anaerobic respiration is same and takes place in the cytoplasm of cells.

QUESTION: 8

When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of

A.
oxygen
B.
carbon dioxide
C.
nitrogen
D.
water vapour

Solution:

The lime water on reaction with exhaled CO₂ forms calcium hydroxide or slaked lime which is milky in color.

QUESTION: 9

Which is the first enzyme to mix with food in digestive tract ?

A.
Pepsin
B.
Cellulose
C.
Amylase
D.
Trypsin

Solution:

Salivary amylase, present in saliva, is the first digestive enzyme that gets mixed with food in oral cavity during the process of mastication and bolus formation.

QUESTION: 10

Which part of alimentary canal receives bile from the liver ?

A.
Stomach
B.
Small intestine
C.
Large intestine
D.
Oesophagus

Solution:

Small intestine receives bile from the liver, which is normally stored in the fall bladder. It performs two functions ie., makes the food alkaline and break the fats present in food into small glodules by the process of emulsification.

QUESTION: 11

In which part of human digestive tract does common bile duct open?

A.
Large intestine
B.
Liver
C.
Stomach
D.
Duodenum

Solution:

Duodenum is first part of small intestine where common bile duct opens.

QUESTION: 12

Which of the following statements is not correct?

A.
Deoxygenated blood is poured into right atrium of heart.
B.
The excretory units of flatworms are flame cells.
C.
Human kidney has about 5 million nephridia
D.
Tracheids and vessels are non -living conducting tissues.

Solution:

Nephridia are segmentally arranged excretory organs present in earthworms. On the basis of their location, three types of nephridia are found in earthworms.

QUESTION: 13

Which of the following protects inner lining of stomach from hydrochloric acid secreted by gastric glands ?