29. A Plant Growth Regulator (PGR) that induces apical dominance is
30. What cell type demonstrate totipotency
31. A laminar flow cabinet
29. The correct answer is Auxin.
Auxin is a plant growth hormone which regulates the apical dominance. In higher plants, the growing apical bud inhibits the growth of the lateral buds. This phenomenon is called the Apical dominance. Auxins are produced mainly in the growing shoot apex and is carried throughout the plant by the phloem and reaches the lateral buds which prevents elongation.
Cytokinins are phytohormones that promote cell division in root and shoot of plants. They also slightly affect in apical dominance, axillary bud growth and leaf senescence.
Gibberellins are phytohormones which regulates stem elongation, dormancy, germination, flowering etc.
30. The correct answer is Meristematic cells.
Totipotency is the capacity of a single cell to divide and generate all of the differentiated cells in an organism. An important cell which exhibit totipotency in plants is the meristematic cells. They are a group of cells which is seen in the root and shoot tips of plants. They are undifferentiated cells and are considered as stem cells. They give rise to many of the cells that go on rapid differentiation and specializes to form various parts of the plant.
Collenchyma cells are thick walled, elongated cells that provide support and structure. Their thick cell wall is composed of cellulose and pectin.
31. The correct answer is (a).
A laminar flow cabinet has sterile airflow from the back of the cabinet towars the operator. This direction of airflow helps to protect the sample from the operator but the operator is not protected from the sample.
29. A Plant Growth Regulator (PGR) that induces apical dominance is Cytokinin Gibberellin Auxin 30. What...