NCERT Class X Science Class: Chapter –6. Life Processer – Part-4

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Question 18:

What prevents backflow of blood inside the heart during contraction?

(a) Valves in heart

(b) Thick muscular walls of ventricles

(c) Thin walls of atria

(d) All of the above

Answer: A

Imageprevents backflow of blood inside the heart

Imageprevents Backflow of Blood Inside the Heart

Imageprevents backflow of blood inside the heart

Question 19:

Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

(a) Labeo, Chameleon, Salamander

(b) Hippocampus, Exocoetus, Anabas

(c) Hyla, Rana, Draco

(d) Whale, Dolphin, Turtle

Answer: B

Question 20:

In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?

(a) Pisces and amphibians

(b) Amphibians and reptiles

(c) Amphibians only

(d) Pisces only

Answer: D

Imagethe pisces

Imagethe Pisces

Imagethe pisces

Question 21:

Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart

(b) They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body

(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body

(d) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body

Answer: D

Image the artery and vein

Image the Artery and Vein

Image the artery and vein

Question 22:

The filtration units of kidneys are called

(a) Ureter

(b) Urethra

(c) Neurons

(d) Nephrons

Answer: D

Image the nephrons

Image the Nephrons

Image the nephrons

Question 23:

Oxygen liberated during photosynthesis comes from

(a) Water

(b) Chlorophyll

(c) Carbon dioxide

(d) Glucose

Answer: A

Image oxygen liberated during photosynthesis water

Image Oxygen Liberated During Photosynthesis Water

Image oxygen liberated during photosynthesis water