Biology
Study the diagram given below and then answer the questions that follow:
(i) Name the part labelled A. Name any two hormones produced by the part labelled A.
(ii) What happens to the part labelled B:
- If fertilisation takes place?
- If fertilisation does not take place?
(iii) Where does fertilisation occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts:
- Acrosome
- Mitochondria
Reproductive System
ICSE 2012
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Answer
(i) The part labelled A is Ovary. Two hormones produced by it are:
- Oestrogen
- Progesterone
(ii) (1) If fertilisation takes place, part B i.e. the uterus gets prepared to receieve the embryo. The endometrial lining thickens and gets highly vascularised. (2) If fertilisation does not take place, the thickened lining of part B i.e. the uterus (endometrium) restarts shedding on the 28th day of the menstrual cycle. Finally it is discharged out along with the unfertilised ovum as the menstrual flow through the cervix and the vagina.
(iii) Fertilisation occurs in the fallopian tube/oviduct.
(iv) Below diagram shows the human sperm with Acrosome and Mitochondria labelled:
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The diagram below shows the Excretory System of a Human being. Study the same and then answer the questions that follow :
(i) Name the parts labelled 1, 2, 3 and 4.
(ii) Give the main function of the parts labelled 5, 6, 7 and 8.
(iii) Name the endocrine gland which could be added in the diagram and state its location/position.
Briefly explain the following:
(i) Osmosis
(ii) Allele
(iii) Pulse
(iv) Reflex action
(v) Synapse
A homozygous plant having round (R) and yellow (Y) seed is crossed with homozygous plant having wrinkled (r) and green (y) seeds :
(i) Give the scientific name of the plant on which Mendel conducted his hybridization experiments.
(ii) Give the genotype of the F1 generation.
(iii) Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation are crossed.
(iv) Name and state the law which explains the dihybrid ratio.
(v) Give the possible combinations of gametes that can be obtained from F1 hybrid.
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(i) What is the aim of the experiment?
(ii) Name the test performed on the leaf and the solution used for the test.
(iii) What type of leaf was used for the experiment? Give an example.
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