Which of the following is a product of meiosis?
Microspore mother cell
Endosperm nucleus (primary)
Megaspore mother cell
Megaspore
(4)
Megaspore is a haploid cell that is formed when the megaspore mother cell undergoes meiosis. It is the initial cell giving rise to female gametophyte.
To perform an experiment to identify the different parts of an embryo of a dicot seed, first of all you require a dicot seed. Select dicot seeds from the following group.
Wheat, Gram, Maize, Pea, Barley, Ground-nut
Wheat, Gram and Pea
Gram, Pea and Ground-nut
Maize, Pea and Barley
Gram, Maize and Ground-nut
(2)
Monocot and dicot plants are the two types of angiosperm plants. The seeds of dicot plants have two cotyledons. Ground-nut, gram, and pea are examples of dicot plants.
On observing an embryo of a pea seed, a student listed its various parts as given below :
Micropyle, Cotyledon, Plumule, Testa, Radicle, Tegmen
On examining the list the teacher remarked that out of these only three parts belong to embryo. Select these three parts:
Testa, Radicle, Cotyledon
Tegmen, Radicle, Micropyle
Cotyledon, Plumule, Radicle
Cotyledon, Plumule, Testa
(3)
Pea is a dicot plant with testa, cotyledons, and embryonic axis in its seed. The cotyledon, plumule, and radicle make up the embryo. Cotyledons are fleshy spherical structures on the embryonic axis that carry reserve feeding resources. The radicle is found on the micropylar end of embryonic axis, while the plumule is found on the other end.
The correct sequence of reproductive stages seen in flowering plants is
gametes, zygote, embryo, seedling
zygote, gametes, embryo, seedling
seedling, embryo, zygote, gametes
gametes, embryo, zygote, seedling
(1)
The male gamete present in the pollen grain and the female gamete egg in the embryo sac are formed by meiosis. The zygote is formed when the male and female gametes unite. The embryo is formed by multiple divisions of the zygote. In the seed, the embryo develops and matures. The seed germinates by absorbing water and grows into a new seedling.
Length of pollen tube depends on the distance between:
pollen grain and upper surface of stigma.
pollen grain on upper surface of stigma and ovule.
pollen grain in anther and upper surface of stigma.
upper surface of stigma and lower part of style.
(2)
The length of pollen tube is determined by the distance between pollen grain on the upper surface of stigma and ovule. This is because pollen germinates and forms pollen tube that reaches up to ovule in ovary and releases male gamete to combine with female gamete.
In which of the given figures, budding is not shown?
I
II
III
IV
(1)
Budding is a asexual reproduction process that involves the formation of a bud that is an outgrowth in the parent body and later breaks down to form a new organism. Due to repeated cell division the hydra forms an outgrowth in a particular site. This bud develops into a new individual and when it matures it detaches from the parent body and becomes a new independent individual. In the given image, the diagram I does not show any bud formation.
Slides A and B were examined and interpreted by four students as a, b, c and d. Identify the correct option:
| Slide A | Slide B |
| (a) Binary fission in Amoeba | Daughter cells of Amoeba |
| (b) Budding in yeast | Buds of Yeast |
| (c) Binary fission in Amoeba | Buds of Yeast |
| (d) Budding in yeast | Daughter cells of Amoeba |
a
b
c
d
(1)
The binary fission is an asexual reproduction observed in amoeba. After the replication process through mitotic division, the amoeba cell divides into two equal halves and these are considered as the daughter cells. In this process, the daughter cells thus produced through cell division are identical to each other as shown in the diagram.
Budding is also a mode of asexual reproduction process that involves the formation of a bud that is an outgrowth in the parent body that later breaks down to form new organisms and the diagrams do not show the bud formation.
Which of the following options shows correct sequence of asexual reproduction in hydra?
(1)
In Hydra, a bud develops as an outgrowth due to repeated cell division at one specific site. These buds develop into tiny individuals and when fully mature, detach from the parent body and become new independent individuals.
Which of the following statements is NOT true regarding asexual reproduction in plants?
Plants that reproduce asexually reach maturity faster than those who reproduce sexually.
Plants that reproduce asexually have greater genetic diversity than those who reproduce sexually.
Plants that reproduce asexually are more stable than those who reproduce sexually.
Plants that reproduce asexually create offspring that are identical to the parent plant.
(2)
Sexual reproduction provides genetic diversity because the sperm and egg that are produced contain different combinations of genes than the parent organisms. Asexual reproduction, on the other hand, does not need sperm and eggs since one organism splits into two organisms that have the same combination of genes.
Vegetative propagation refers to formation of new plants from:
stem, roots and flowers
stem, roots and leaves
stem, flowers and fruits
stem, leaves and flowers
(2)
In vegetative propagation, vegetative parts of a plant such as root, stem, leaf, etc., can produce new plants. Vegetative reproduction is seen in plants like orchids, ornamental plants, grasses, banana, rose, jasmine, etc.
