In the following figure showing a germinating gram seed, name the parts labelled as A, B, and C. Why is part 'B' considered to be important during germination?

The given figure shows a germinating gram seed, the name of the parts is as follows- Part A - Plumulae Part B - Cotyledon Part C - Radicle Cotyledon is an essential part of a plant seed. It is the seed's main embryonic leaf and is important for germination because it provides the seedling with the nutrients it needs to grow quickly before learning how to produce its energy through photosynthesis.

Define the term pollination. Differentiate between self-pollination and cross-pollination. What is the significance of pollination?

Pollination is the process of transferring pollen grains from the anther to the female part that is stigma of the same or different flower. Characteristics Self-pollination Cross-pollination Definition It is the transfer of pollen grains from the anther to the stigma of the same flower or another flower borne on the same plant. It is the transfer of pollen grains from the anther of one flower to the stigma of another flower borne on a different plant of the same species. Agents External agent not required. External agents like wind, water, insects, etc, are always required. Significance of pollination are listed below: Pollination is required for fertilization and zygote formation. Pollination helps in the production of seeds and fruits which ensures the continuity of plant species. Cross-pollination helps in the production of variation in species. Pollination is a pre-requisite for fertilization in flowering plants.

After examining a prepared slide under the high power of a compound microscope, a student concludes that the given slide shows the various stages of binary fission in a unicellular organism. Write two observations on the basis of which such a conclusion may be drawn.

Unicellular organism: Unicellular organisms are made up of only one cell. They carry out all the functions needed by the organism. Some examples of unicellular organisms are Amoeba , bacteria, etc. Binary fission: Binary fission, asexual reproduction by a separation of the body into two new bodies. The two observation that was taken by the student that concludes that the given slide shows the various stages of binary fission of a unicellular organism are as follows: Karyokinesis: In this process, the nucleus of the parent cell divides into two daughter nuclei. Cytokinesis: It is the process by which the cytoplasm of the parent cell, divides into two daughter cells.

List in proper sequence four steps of obtaining germinating dicot seeds.

A seed is formed by the fertilized ovule and pollen egg. It contains reserve food and a protective coat. When the seed is sown in the soil a new plant appears from the embryo. Dicot seed: The seed having two cotyledons is called a dicot seed. For example; gram and bean seed. The four steps for germinating dicot seeds are as follows: Imbibition: Dry seeds absorb water during the imbibition process. This results in swelling and softening of the seed coat. Respiration: In the absence of oxygen, anaerobic respiration occurs. Respiration provides energy to the seed for metabolic activity. Effect of Light: Light is important for germination as it initiates the metabolic activities inside the seed. Mobilization of reserve food: The mobilization of seed storage proteins upon seed imbibition and germination is a crucial process in the establishment of seedling. This provides essential energy to fuel growth until the seedling becomes photoautotrophic.

What is carpel? Write the function of its various parts.

Carpel is the ovule-bearing female reproductive organ in plants. Stigma, style, and ovary are three parts of a carpel. The functions are as follows: Stigma : It is the top portion of a carpel. It is the site of pollination. Pollination is the process of transfer of pollen grains from anther to the stigma. Style : It is a long, tubular structure that connects the stigma to the ovary. Ovary : It is a basal part that contains ovules that produce the seeds.

A student is viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes.

The most common method of reproduction in yeast is asexual reproduction by budding, where a small bud is formed on the parent cell. The nucleus of the parent cell splits into a daughter nuclei and migrates into the daughter cell.

Write the function of the following part in the human female reproductive system: Uterus

A uterus is a part of the female reproductive system. It is also called the womb. The functions are as follows: It receive and nurture the growing embryo. It nourishes the growing embryo (it is richly supplied with blood).

Write the function of the following part in the human female reproductive system: Oviduct

The functions of oviduct (fallopian tube) are as follows: It is the pathway through which the mature egg passes from the ovary to the uterine cavity. It is a site of fertilisation (it is a process of fusion of sperms and eggs).

Write the function of the following part in the human female reproductive system. Ovary

Ovaries are the main female sex organs. They produce female gametes. It measures about 2 to 4 cm in length. The functions are as follows: They produce one egg every month. They are also responsible for the production of sex hormones such as oestrogen and progesterone.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - I)>Q 14

EASY

10th CBSE

IMPORTANT

Earn 100

Give reason why uterine lining becomes thick and spongy after fertilisation.

Important Questions on How do Organisms Reproduce?

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - I)>Q 15

Name the reproductive and non-reproductive parts of bread mould (Rhizopus).

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - I)>Q 16

List any two advantages of vegetative propagation.

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - I)>Q 17

Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - I)>Q 18

What is puberty? Mention any two changes that are common to both boys and girls in early teenage years.

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - I)>Q 19

Name the two types of gametes produced by men.

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - I)>Q 20

How many types of gametes are produced by a human female?

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 8 - How do Organisms Reproduce?>CBSE-2022 (Delhi Term II - II)>Q 21

In the following figure showing a germinating gram seed, name the parts labelled as A, B, and C.
Question Image
Why is part 'B' considered to be important during germination?