Gas exchange in plants and animals

When you hold your breath, which of the following gas changes in the blood first leads to the urge to breathe?

• Rising oxygen

• Falling oxygen

• Rising carbon dioxide

• Falling carbon dioxide

The group of vertebrates that relies on gas exchange across the skin as well as at the lungs to maintain sufficient blood oxygen levels is:

• The fishes

• The reptiles

• The amphibians

• The birds

What is the name of blood vessel that surrounds the alveoli called?

• bronchiole

• capillaries

• red blood cell

• alveolus wall

Which of the following takes place after blood pass through alveoli?

• Carbon dioxide in the blood moves into the alveolus

• Oxygen in the red blood cell moves into the alveolus

• Oxygenated blood becomes deoxygenated blood

What part of the respiratory system is shown in the picture?

• trachea

• lungs

• alveoli

• pharynx

What type of organism makes its own food?

• Autotroph

• Heterotroph

Tiny pores present on the surface of leaves of the plants for exchange of gases are called-

• Stomata

• Chloroplast

• Spiracles

The raw materials used for photosynthesis are

• CO₂, O₂, H₂

• CO_2, Water

• N₂, Water

• O_{2 ,} Water

The waxy, waterproof layer that covers most leaves is called the what?

• spore
• cuticle
• seed coat
• xylem

Xylem and phloem are examples of _ tissue

• Spores
• Nonvascular
• Seeds
• Vascular