Biology
Assertion: Leukoplasts are the kind of plastids which do not contain any pigment. They are colourless.
Reason: Leukoplasts do not play any significant role in plants due to the absence of pigments.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
A is true but R is false.
Reason — A is true as leukoplasts are colourless plastids because they lack pigments. They are commonly found in roots, seeds, and underground stems.
R is false as even though leukoplasts lack pigments, they perform important functions such as storage of starch, proteins, oils.
Therefore, A is true but R is false is the correct option.
Related Questions
Assertion: The cell membrane of a cell is selectively permeable as it allows the entry or exit of certain substances only.
Reason: The cell membrane acts as a rigid barrier, protecting cells from mechanical injury and pathogen attack.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion: The nucleus is an integral part of a cell which contains a definite number of chromosomes in each cell of every species.
Reason: Chromosomes carry hereditary units called genes, responsible for transmitting characteristics from parents to offsprings.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Match the terms given in column A with those of column B :
Column A Column B (i) Paramecium (a) Cylindrical (ii) White blood cells (b) Spherical (iii) Smooth muscles (c) Amoeboid (iv) Spirogyra (d) Slipper-shaped (v) Red blood cells (e) Spindle-shaped Fill in the blanks with suitable words :
- Inside the nucleus, there is a small, spherical, darker body called …………… .
- The plastids which do not contain any pigment are called …………… .
- Cell wall is composed of …………… .
- …………… contain yellow and red pigments.
- The process of preparing food by the plants is known as …………… .