Biology
The diagram given below represents a stage during cell division. Study the same and answer the questions that follow:
(i) Identify whether it is a plant cell or an animal cell. Give a reason in support of your answer.
(ii) Name the stage depicted in the diagram. What is the unique feature observed in this stage?
(iii) Name the type of cell division that occurs during:
- Replacement of old leaves by new ones.
- Formation of gametes.
(iv) What is the stage that comes before the stage shown in the diagram?
(v) Draw a neat, labelled diagram of the stage mentioned in (iv) above keeping the chromosome number constant.
Answer
(i) It is an animal cell as centrioles are present. (It can be a plant cell also as it is double layered which means cell wall is present. Moreover, astral rays are also absent).
(ii) Metaphase. The unique feature is that chromosomes are in the equatorial plane.
(iii) The respective cell divisions are mentioned below:
- Mitosis
- Meiosis
(iv) Prophase.
(v) Labelled diagram of Prophase is shown below:
Related Questions
Given below is a representation of a type of pollution. Study the picture and answer the questions:
(i) Name the type of pollution shown in the picture.
(ii) Name one source of this pollution.
(iii) How does this pollution affect human health?
(iv) Write one measure to reduce this pollution.
(v) State one gaseous compound that leads to the depletion of the ozone layer and creates 'Ozone holes'.
Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong:
Example: Nose, Tongue, Arm, Eye
Answer: Odd Term – Arm, Category – Sense organs
(i) Detergents, X-rays, sewage, oil spills
(ii) Lumen, muscular tissue, connective tissue, pericardium
(iii) Dendrites, Medullary Sheath, Axon, Spinal cord
(iv) Centrosome, Cell wall, Cell membrane, Large vacuoles
(v) Prostate gland, Cowper's gland, seminal vesicle, seminiferous tubules.
Mention the exact location of the following:
(i) Epididymis
(ii) Lacrimal gland
(iii) Malleus
(iv) Hydathodes
(v) Pulmonary semilunar valve
Given below are diagrams showing the different stages in the process of fertilisation of an egg in the human female reproductive tract.
Study the diagrams and answer the questions:
(i) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation.
(ii) Where does fertilisation normally take place? What is 'Implantation' that follows fertilisation?
(iii) Mention the chromosome number of the egg and zygote in humans.
(iv) Explain the term 'Gestation'. How long does Gestation last in humans?
(v) Draw a neat, labelled diagram of a mature human sperm.