Class 7 Science Chapter 8 MCQ

Seeds of drumstick and maple have wing which help them to be easily carried away by wind. Various seeds and fruits have some special feature due to which they are carried away in a particular way (by wind, water or animal).

Here, all the statements are correct. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].

Ovules contain the female gamete or female sex cells of the plant. The ovary contains one or more ovules. Each ovule contains only one female gamete of the plant. The female gamete or female sex cells of the plant which is present inside the ovule is called egg.

The axillary buds can give rise to new plants. Vegetative buds of a plant are used as a means of asexual reproduction for producing new plants.

Most plants have roots, stems and leaves. These are called the vegetative parts of a plant. After a certain period of growth, most plants bear flowers. The flowers perform the function of reproduction in plants. Flowers are the reproductive parts of a plant.

Here, all the statements are correct. Hence, your answer will be option [D].

The process in which the male gamete present in pollen grain fuses or joins with the female gamete present in ovule to form a new cell called zygote, is called fertilization. After fertilization two main things happen. As the ovule present in ovary grows to become a seed. After fertilization ovary of a flower develops and becomes a fruit (with seeds inside it). Thus, fruit is the ripened ovary of a flower.

Most plants have roots, stems and leaves. These are called the vegetative parts of a plant. After a certain period of growth, most plants bear flowers. The flowers perform the function of reproduction in plants. The process in which the male gamete present in pollen grain fuses or joins with the female gamete present in ovule to form a new cell called zygote, is called fertilization. After fertilization two main things happen. As the ovule present in ovary grows to become a seed. After fertilization ovary of a flower develops and becomes a fruit (with seeds inside it). Thus, fruit is the ripened ovary of a flower. When a seed is sown in the moist soil, it begins to grow and called germination. And in this stage, the seed coats splits (as tiny root grows) downward and (the shoot grows) upwards. The seedling grows further and ultimately forms a new plant. And after a certain period, the plant bears flowers once again.

The roots of some plants like sweet potato and Dahlia can be used to produce new plants. And also, leaves of some plants can reproduces new plants, such as Bryophyllum.

The main parts of a flower are receptacle, sepals, petals, stamen and pistil. Receptacle is the base of flower where all parts of a flower are attached. Sepals is the green leaf like parts of a flower which can be seen in a form of bud. Petals are the colorful part of flower. Stamen is the male reproductive organ of a plant. Pistil present in the center of a flower. It is the female reproductive organ of the plant. The stamen made of two parts “filament and anther”. And anther makes the “pollen grains” and stores them. This further transfer of pollen grains makes pollination, fertilization and getting a fruit (with seed inside it). And again this seed germinate into a new plant which bears flowers after certain time.

An alga, spirogyra reproduce by the asexual method of reproduction called fragmentation. But yeast reproduces by budding.

The process in which the male gamete present in pollen grain fuses or joins with the female gamete present in ovule to form a new cell called zygote, is called fertilization. After fertilization two main things happen. As the ovule present in ovary grows to become a seed. After fertilization ovary of a flower develops and becomes a fruit (with seeds inside it). Thus, fruit is the ripened ovary of a flower.

In the presence of water and nutrients, algae grow and multiply rapidly by fragmentation. An alga breaks up into two or more fragments, each of which grow into new individuals. This process covers a large area in a short period of time.

Stamen is the male reproductive organ of the plant whereas stigma is the female reproductive organ of the plant.

Here, all the statements are correct. Hence, your answer will be option [D].

Spore formation is an asexual method of reproduction in plants, spores are not seeds. Most of the fungi and flowerless plant (such as “ferns and mosses”) reproduce asexually by means of spores. The common “bread mould” plant which grows on a piece of stale bread is a fungus. The common bread mould plant on rhizopus fungus reproduces by the method of spore formation. An alga, reproduces by the asexual method of fragmentation.

Here, all the statements are correct. Hence, your answer will be option [D].

The eye of the potato is the same as the bud is to “Bryophyllum” leaf. Both the structures are vegetative propagules. They can form a new plant from them. This method of asexual reproduction through the vegetative parts of the existing plant is called “vegetative propagation”.

The process in which the male gamete present in pollen grain fuses or joins with the female gamete present in ovule to form a new cell called zygote, is called fertilization. After fertilization two main things happen. As the ovule present in ovary grows to become a seed. After fertilization ovary of a flower develops and becomes a fruit (with seeds inside it). Thus, fruit is the ripened ovary of a flower.

Cutting are a means of asexual reproduction in plants. The new plant formed from a cutting is exactly similar to the parent plants. The plants like rose, money plant, grapes, sugar cane, bananas, cactus can be grown by cutting method or by using stem cutting or branch cutting. But maize or corn is a plant belonging to the family of grasses. It does not flower readily and seed production is unusual except in its native habitat. Under natural conditions, maize reproduces only by seed production.

For the male gamete to be able to combine with the female gamete, it is necessary that first the pollen grains from the anther of stamen of a flower should be carried to the stigma of pistil. The transfer of pollen grains from the anther of a stamen to the stigma of pistil is called pollination. When pollination is done by insects such as bees and butterflies, called cross-pollination.

The seeds and fruits dispersed by wind either have wing like structures or they have hair or they are very small and light, which helps them to be easily carried away by the blowing wind. Such as the seed of drumstick plant, the seeds of madar plant, the plants like grasses and orchids have very small and light seeds which can be easily blown away by the wind for dispersal. The seeds of water lily plant and coconut plant are dispersed by water.

Here, all the statements are correct. Hence, your answer will be option [D].

The transfer of pollen grains from anther of a stamen to stigma of a pistil is called pollination. It can occur by two ways as self-pollination (transfer occur in same flower or another flower of same plant) and cross-pollination (transfer occurring between flowers of two separate but similar plants. Insects, water and wind are agents of pollination.