Science 1 Marks Question

Gamete is the odd-one out as it is responsible for sexual reproduction while the remaining three are methods of asexual reproduction.

Reproduction is essential for continuation of the species from generation to generation.

The ability of living things to repair themselves or grow lost parts is called regeneration.

Hooks and spines help seeds and fruits to stick to the bodies of animals and be safely dispersed or transported to far off places.

Spores are covered by a hard covering to provide protection from harsh conditions.

The transfer of pollen grains of a flower to the stigma of same flower or that of a different flower of the same kind is called pollination.

If the filament of Spirogyra are broken into fragments, then each fragment will develop into a new plant.

Asexually by vegetative propagation.

By pollinating agents like wind, water and animals.

Roots that store food are known as tubers.

By the means of spores.

A node is a part of the stem from where a leaf grows.

The process of reproduction is necessary for the perpetuation and preservation of species and to increase the number of members of species.

A flower may have either male or female reproductive parts. Such a flower is called unisexual flowers.

Tubers.

Algae reproduce by a method known as fragmentation. The breaking down of filaments into fragments that grow into young ones is called fragmentation.

Pollen.

Seed dispersal takes place by means of wind, water and animals.

Mould is a type of fungus that grows on moist organic surfaces like leather shoes and moist walls.

Spores are produced by fungi, ferns and mosses during unfavourable conditions.

The fusion of male and female gametes is termed as fertilisation.

Fusion of the male and female gametes is called fertilization.

Flower.

This is done to avoid overcrowding and to avoid scarcity of nutrients, light, air and space for the seeds.

Moss and ferns.

Flowers are so colourful because they absorb and reflect light energy. Fragrance results from production of volatile chemicals which evaporate.

The male reproductive part is stamen and the female reproductive part is pistil.

Zygote is a product formed by the fusion of the male and female gametes.

Production of new individuals from the vegetative part of parent is called vegetative propagation.

Oscillatory motion.

The given figure shows self-pollination, as the pollen grains from anther of flower are transferred to the stigma of same flower.

The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as pollination.

A flower may have either male or female reproductive parts. Such a flower is called unisexual.

Grafting is an artificial method of vegetative propagation in which the desired plant is obtained from two different individual plants called stock (root portion from one plant) and Scion (stem portion from another plant).

Binary fission.

Circular motion.

The breaking of the body into two or more parts is called fragmentation. It can be seen in Spirogyra.

The anther of flower contains pollen sacs that produce Pollen grains.

Asexual and sexual.

1. Wind.
2. Water.
3. Man and animals, birds, bats, squirrels.

Root, stem and leaves.

After fertilisation, the ovary of a flower develops and becomes a fruit with seeds present inside.

Unisexual flower can self-pollinate where both male and female flowers are present on the same plant. The stigma of the female flower can be pollinated by the pollen of the male flower present on the same plant.

A stamen consists of anther and filament.

During wind pollination many pollen grains are lost. So to ensure that at least some pollens reach the stigma, a large number of pollen grains are produced.

The four main parts of a flower are:

1. Sepals.
2. Petals.
3. Stamen.
4. Pistil.

Budding.

Coconut.

Straight line motion.

Pollen grains.