1. Fill in the blanks:-
(a) New cells are formed from pre-existing cells.
(b) Movement of water molecules from their higher concentration to their lower concentration through a semi- permeable membrane is called Osmosis.
(c) The functional components of cell are plasma membrane, cytoplasm & nucleus.
(d) Protoplasm has two parts- cytoplasm & nucleoplasm.
(e) Nucleus, mitochondria & plastids have their own DNA & ribosomes.
(f) The shrinkage or contraction of the contents of the cell away from the cell wall is known as plasmolysis.
(g) The process by which Amoeba can engulf a food particle is endocytosis.
(h) Biogenesis is the manufacture of lipids required for making cell membrane.
(i) A cell that lacks nuclear membrane is called a prokaryotic cell & the nuclear region is called nucleoid.
(j) Movement of materials in & out of the cell takes place by diffusion & osmosis.
2. What is the advantage of multicellularity over unicellularity?
Ans- Division of labour.
3. What are the chromosomes made up of?
Ans- DNA & proteins
(a) New cells are formed from pre-existing cells.
(b) Movement of water molecules from their higher concentration to their lower concentration through a semi- permeable membrane is called Osmosis.
(c) The functional components of cell are plasma membrane, cytoplasm & nucleus.
(d) Protoplasm has two parts- cytoplasm & nucleoplasm.
(e) Nucleus, mitochondria & plastids have their own DNA & ribosomes.
(f) The shrinkage or contraction of the contents of the cell away from the cell wall is known as plasmolysis.
(g) The process by which Amoeba can engulf a food particle is endocytosis.
(h) Biogenesis is the manufacture of lipids required for making cell membrane.
(i) A cell that lacks nuclear membrane is called a prokaryotic cell & the nuclear region is called nucleoid.
(j) Movement of materials in & out of the cell takes place by diffusion & osmosis.
2. What is the advantage of multicellularity over unicellularity?
Ans- Division of labour.
3. What are the chromosomes made up of?
Ans- DNA & proteins