Science 1 Marks Question

Ovary is the part where male and female gametes fuse together.

Tissue culture is an artificial method of vegetative propagation in which tissue from the plant tip is grown in an artificial nutrient medium to produce callus which can produce new plants.

Mustard and rose.

Binary fission is the odd-one out as it a method of asexual reproduction while the rest three are artificial methods of vegetative propagation.

There are different methods by which plants reproduce asexually. They are vegetative propagation, budding, fragmentation and spore formation.

Vegetative propagation is defined as the production of a new individual from a body part like leaves, stems and roots.

Carpel.

Xanthium and Urena.

Reproduction is the process of production of new similar organisms from their parents.

Male reproductive part.

Flowers are generally attract insects and other living organisms for pollination.

Oscillatory motion.

Cucumber, maize and watermelon.

The bulb-like projections formed during reproduction are called buds.

Fungi, ferns and mosses reproduce by spore formation.

The fusion of male nucleus (male gamete) with that of egg cell (female gamete) is known as fertilisation.

If seeds are not able to disperse, they will clutter on one place and would not be able to grow properly because of lack of nutrients.

To avoid growing of the plants at one place leading to scarcity of nutrients and ensure survival of the plants, seeds are dispersed.

Banana forms from one parent only. There is no seed production.

Straigght line motion.

Vallisneria and Hydrilla.

The three agents of pollination are:

1. Insect.
2. Wind.
3. Water.

Mulberry.

Pollen grains have a tough protective coat which presents them from drying up.

Insect pollinated flowers are brightly coloured and sweet smelling to attract insects to itself.

The two ways in which pollination may occur in plants are:

1. Self-pollination.
2. Cross-pollination.

Buds are small bulb-like projections of yeast cell. These are asexual reproducing bodies of yeast.

In sexual reproduction, the male and the female gametes fuse to form seeds that eventually develop into new plants.

A carpel consists of the ovary, style and stigma.

1. Spirogyra – fragmentation.
2. Yeast – budding.
3. Money plant – Vegetative propagation.

Zygote.

Dispersal is the scattering of seeds to far away places. The agents of dispersal are wind, water, insects and animals.

Sweet potato and dahlia develops new plants through their roots by the process of vegetative reproduction.