Assertion : Leaves of Bryophyllum, Begonia help in vegetative multiplication.
Reason : Leaves of these plants possess adventitious buds.
Important Questions on Modes of Reproduction
Lateral branches arise from the basal and underground part of the main stem
Branches bent and grow downwards
Branches grow obliquely upwards
Lateral branches arise from the base of the main axis and are aerial
Match the following
| List-I | List-II | ||
| (A) | Longitudinal binary fission | (I) | Paramoecium |
| (B) | Transverse binary fission | (II) | Amoeba |
| (C) | Sporogony | (III) | Pleurobrachia |
| (D) | Sporulation | (IV) | Plasmodium |
| (V) | Euglena |
Statement I: The binary fission of Euglena is called homothetogenic fission because the daughter euglenae are like mirror images.
Statement II: Binary fission in Paramecium is known as perkinetal fission because it occurs at right angles to the kineties.
Identify the asexual reproductive structure in the following diagram:
Statement In ciliates, conjugation restores the vigour and vitality which are lost due to chromosomal imbalance in the macronuclei due to repeated amitotic divisions.
Reason Conjugation is temporary union of senile ciliates belonging to same mating types. It often prevents exchange of nuclear material.
(i) During favourable conditions Paramecium stops feeding after attaining its maximum growth.
(ii) At first the micronucleus divides by amitosis and the macronucleus divides into two daughter nuclei by mitosis.
(iii) The proter receives the anterior contractile vacuole, cytopharynx and cytostome from its parent individuals.
(iv) Before karyokinesis a transverse constriction appears in the middle of the body.
