NCERT Class-9 Science Solutions: Chapter 5-the Fundamental Unit of Life Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get unlimited access to the best preparation resource for CBSE/Class-9 Science: fully solved questions with step-by-step explanation- practice your way to success.

Question 7:

Plasmolysis in a plant cell is defined as

  1. Break down (lysis) of plasma membrane in hypotonic medium
  2. Shrinkage of cytoplasm in hypertonic medium
  3. Shrinkage of nucleoplasm
  4. None of them

Answer: B


Question 8:

Which of the following are covered by a single membrane?

  1. Mitochondria
  2. Vacuole
  3. Lysosome
  4. Plastid

Answer: B

Question 9:

Find out the false sentences

  1. Golgi apparatus is involved with the formation of lysosomes
  2. Nucleus, mitochondria and plastid have DNA; hence they are able to make their own structural proteins
  3. Mitochondria is said to be the power house of the cell as ATP is generated in them.
  4. Cytoplasm is called as protoplasm

Answer: A

Question 10:

Find out the correct sentence

  1. Enzymes packed in Lysosomes are made through RER (rough endoplasmic reticulum)
  2. Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively
  3. Endoplasmic reticulum is related with the destruction of plasma membrane
  4. Nucleoid is present inside the nucleoplasm of eukaryotic nucleus

Answer: A

Question 11:

Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

  1. Golgi apparatus
  2. Lysosomes
  3. Smooth endoplasmic reticulum
  4. Vacuoles

Answer: C

Question 12:

The proteins and lipids, essential for building the cell membrane, are manufactured by

  1. Rough endoplasmic reticulum
  2. Golgi apparatus
  3. Plasma membrane
  4. Mitochondria

Answer: A

Question 13:

The undefined nuclear region of prokaryotes are also known as

  1. Nucleus
  2. Nucleolus
  3. Nucleic acid
  4. Nucleoid

Answer: D