Life Processes | Top 20 MCQs | Class-10th | Part-1 | Ch-6 | Science | CBSE | NCERT | For term 1 exam

Question 1.

Name the pores in a leaf through which respiratory exchange of gases takes place.

(a) Lenticels

(b) Vacuoles

(c) Xylem

(d) Stomata

When a few drops of iodine solution are added to rice water, the solution turns blue- black incolour. This indicates that rice water contains:

(a) fats

(b) complex proteins

(c) starch

(d) simple proteins

The exit of unabsorbed food material is regulated by

(a) liver

(b) anus

(c) small intestine

(d) anal sphincter

Amoeba shows following kind of nutrition.

(a) autotrophic

(b) holozoic

(c) saprotrophic

(d) parasitic

Which region of the alimentary canal absorbs the digested food?

(a) Stomach

(b) Small intestine

(c) Large intestine

(d) Liver

Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva?

(a) Starch breaking down into sugars

(b) Proteins breaking down into amino acids.

(c) Absorption of vitamins.

(d) Fats breaking down into fatty acids and glycerol.

Trachea do not collapse when there is not much air because they are:

(a) thick and muscular

(b) having cartilaginous rings

(c) have valves

(d) supported by larynx.

The process by which blood is cleared of metabolic wastes in case of kidney failure is called

(a) artificial kidney

(b) dialysis

(c) transplantation

(d) filtration

The filtration units of kidneys are called – 

(a) Ureter

(b) Urethra 

(c) Neurons 

(d) nephrons

The contraction and expansion movement of the walls of the food pipe is called:

(a) translocation

(b) transpiration

(c) peristaltic movement

(d) digestion

Woody plants carry gaseous exchange through

(a) root hair

(b) stem hair

(c) Lenticels

(d) epidermal cells.

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

(a) Pisces only 

(b) Amphibians only

(c) Amphibians and reptiles only 

(d) Pisces and amphibians

During contraction of heart, what prevents back flow of blood?

(a) Thin walls of atria

(b) Thick muscular walls of ventricles

(c) Valves in heart

(d) All of the above

The site of photosynthesis in the cells of a leaf is

(a) chloroplast

(b) mitochondria

(c) cytoplasm

(d) protoplasm

The mode of nutrition found in fungi is: 

(a) Parasitic nutrition 

(b) Holozoic nutrition 

(c) Autotrophic nutrition

(d) Saprotrophic nutrition 

Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps?

(a) Ethanol + Carbon dioxide + Energy 

(b) Lactic acid + Energy

(c) Carbon dioxide + Water + Energy 

(d) Pyruvate 

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

(a) oxygen 

(b) nitrogen 

(c) water vapour

(d) carbon dioxide