Biology
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.
Answer
Both A and R are true and R is the correct explanation of A.
Reason — A is true as the nucleus contains chromosomes, and each species has a characteristic number of chromosomes.
R is true as genes present on chromosomes control heredity and transfer traits from parents to offspring.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
Related Questions
Assertion: Root hairs are very important for the survival of plants as they absorb the raw materials for photosynthesis (water and dissolved minerals) from the soil.
Reason: Photosynthesis occurs in the chloroplasts of leaf cells.
- 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 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: 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.
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