10. "Life begins from a single cell”. Comment.
9.
11. Why are mitochondria called the “powerhouses of the cell"?
B. Give reasons for the following:
1. White blood cells can change their shape.
2. Red blood cells don't have nucleus.
3. Muscle cells are spindle shaped.
4. Lysosomes are the suicidal bags of the cell.
5. Plant cells have bigger vacuoles.
6. Rough and smooth Endoplasmic Reticulum are called so.
I WILL MARK Y AS THE BRAINLYIEST
Answers
Answer:
11 because mitrochondria is a site for respiration
Explanation:
10.After fertilization, a zygote is formed which is a single cell. It multiplies continuously to form an organism.
11.They produce energy in the form of ATP during cellular respiration.
B. 1.White blood cells have to engulf foreign particles and travel through narrow passages.
2.In order to accommodate greater amount of hemoglobin.
3.Spindle shape helps them to align themselves properly over another and also makes it easier to contract and relax during body movement.
4.When the cell gets damaged, the lysosomes in it may burst, digesting their own cell.
5.Vacuoles are full of sap and provide turgidity and rigidity to the cell. Many substances like amino acids, sugars, proteins and many organic acids which are important in the life of a plant cell are stored in the vacuole and thus they are bigger.
6.The smooth endoplasmic reticulum does not have ribosomes on it which gives it a smooth appearance while rough endoplasmic reticulum has ribosome which gives it a rough appearance. Hence, they are called so.