Question

a) Green plastids are called __________.
b) Plant cell has a big central ___________.
(Fill in the blanks.)

Answer 1

Hint: Plastids are complex organelle present in plant cells and algae whose main function is to store or manufacture food through photosynthesis.

Complete answer:
The cells of a plant are eukaryotic with a true nucleus and other functional organelles. Plant cell consists of a cell wall that maintains the structure of the cell, a cell membrane that allows passage of important nutrients inside the cell, a nucleus that functions as the storage for the genetic material (DNA), plastids that stores starch and perform photosynthesis, a central vacuole that sustains the pressure against the cell wall and many more organelles. Plastids are of different types: Chromoplast is found in flowering plants and has a carotenoid pigment that gives a different colour to fruits and flowers. Leucoplast is a non-pigmented plastid found in non-photosynthetic plants. Chloroplast synthesizes food through photosynthesis as it contains a green-coloured pigment called chlorophyll, which is also responsible for the green colour in leaves. They are also called green plastids. A plant cell has a big central vacuole. It comprises almost 30 percent of plant cell volume and sustains the pressure against the cell wall. It has a cell sap that contains various enzymes, salts, and other nutrients.
Hence;
i) Green plastids are called a chloroplast.
ii) Plant cells have a big central vacuole.

Note: Plastids have their own separate DNA. The different colours of leaves, flowers and fruits are due to pigments present in the plastid. The central vacuoles in the plant cells are responsible for regulating homeostasis in the plant body by controlling the ion concentration and pH, cell volume, toxic ions, etc.