Reproduction

The governing concept is chemotropism, in which growth is directed by chemical substances. During reproduction in flowering plants, chemical signals associated with the ovule and female tissues guide the pollen tube through the style toward the ovule, allowing the male gametes to reach the embryo sac. Light, gravity and touch are not the primary directional cues in this case. Therefore option B is correct, and the item also connects directly with plant reproduction.

Step 1: Reproduction is an important life process. Step 2: Through it organisms produce new offspring of their own kind. Step 3: In exams link reproduction with continuity of species.

Step 1: In asexual reproduction offspring are formed from one parent. Step 2: There is no fusion of male and female gametes. Step 3: Remember it as one parent reproduction.

Step 1: Sexual reproduction involves two types of gametes. Step 2: A new cell forms when male and female gametes fuse. Step 3: So link it with fusion of gametes.

Step 1: Amoeba is a unicellular organism. Step 2: One cell divides into two parts. Step 3: This method is called binary fission.

Step 1: A small bud forms on the body of yeast. Step 2: This bud grows into a new organism. Step 3: It is asexual reproduction from one parent.

Step 1: A small bud like outgrowth forms on Hydra. Step 2: It can grow into a new Hydra. Step 3: Therefore budding is the main method in Hydra.

Step 1: Spirogyra is a thread like organism. Step 2: Its body can break into small fragments. Step 3: Each fragment can form a new organism.

Step 1: In Rhizopus spores form inside sac like structures. Step 2: Under favourable conditions spores can form new organisms. Step 3: Treat it as a method of asexual reproduction.

Step 1: Root stem and leaf are vegetative parts of a plant. Step 2: A new plant can form from these parts. Step 3: This is called vegetative propagation.

Step 1: Potato is a modified stem. Step 2: The eyes of potato contain buds. Step 3: These buds can grow into new plants under favourable conditions.

Step 1: Small buds form on the leaf margins of Bryophyllum. Step 2: These buds can fall on soil and grow into new plants. Step 3: This is an example of vegetative propagation.

Step 1: New plants can be grown in a laboratory from small plant tissue. Step 2: Many plants can be obtained in less time. Step 3: Link tissue culture with rapid plant multiplication.

Step 1: A flower may have male and female reproductive parts. Step 2: Stamen is the male reproductive organ. Step 3: Pollen grains are formed on the stamen.

Step 1: Pistil is the female reproductive organ of a flower. Step 2: It has stigma style and ovary. Step 3: Ovules are present inside the ovary.

Step 1: Stamen is the male part of a flower. Step 2: Pollen grains are formed in the anther of the stamen. Step 3: Pollen grains are related to male gametes.

Step 1: The lower swollen part of pistil is the ovary. Step 2: Ovules are present inside the ovary. Step 3: After fertilisation ovule can become a seed.

Step 1: Pollen grains are formed in the anther. Step 2: They reach the stigma. Step 3: This transfer is called pollination.

Step 1: In self pollination pollen reaches the same flower or another flower of the same plant. Step 2: Transfer occurs within the same plant. Step 3: Remember it through the meaning of self pollination.

Step 1: Cross pollination involves two different plants. Step 2: Pollen reaches a flower on another plant of the same species. Step 3: This can increase chances of variation.