Haryana Board (HBSE) Class 12 Biology SAT-1 Question Paper 2024 PDF Download. SAT (Students Assessment Test). HBSE Class 12 Biology SAT Question Paper 2024. Haryana Board Class 12 Biology Students Assessment Test 2024. HBSE Class 12th Biology SAT 2024 Answer. Haryana Board Class 12 Students Assessment Test. Haryana Board Class 12 Biology SAT Paper 2024 Solution. हरियाणा बोर्ड कक्षा 12 जीव विज्ञान SAT पेपर 2024.
HBSE Class 12 Biology SAT-1 Question Paper 2024 Answer Key
Instructions :
• All questions are compulsory.
• Questions (1-9) carry 1 mark each.
• Questions (10-12) carry 2 marks each.
• Questions (13-14) carry 3 marks each.
• Question (15) case study, carry 4 marks.
• Questions (16-17) carry 5 marks each.
1. The transfer of pollen from the anther to stigma is called :
(a) Pollination
(b) Fertilization
(c) Adoption
(d) Diffusion
Answer – (a) Pollination
2. Which of the following is a recessive trait for a character chosen by Mendel in garden pea?
(a) Violet flower colour
(b) Yellow pod colour
(c) Axial flower position
(d) Tall stem height
Answer – (b) Yellow pod colour
3. Chromosomal theory of inheritance was proposed by :
(a) Watson and Crick
(b) Sutton and Boveri
(c) Bateson and Punnet
(d) T.H Morgan
Answer – (b) Sutton and Boveri
4. AIDS is caused by HIV. HIV does not spread by which of the following mean :
(a) Transfusion of contaminated blood.
(b) Sharing of infected needles.
(c) Shaking hands with infected person.
(d) Sexual contact with infected person.
Answer – (c) Shaking hands with infected person.
5. Relaxin hormone is secreted by ……………
Answer – ovary and placenta
6. The first ever human hormone produced by recombinant DNA technology is ……………
Answer – insulin
7. What is present in the middle piece of sperm?
Answer – Mitochondria
8. How many male gametes are formed in a single male gametophyte?
Answer – Two
9. Assertion (A) : Cross of F1 individual with recessive homozygous parent is test cross.
Reason (R) : No recessive individual are obtained in the monohybrid test cross progeny.
Answer – Assertion is true but Reason is false.
10. Type of chromosomes present in male and female.
Answer – Male (XY) and Female (XX)
11. Give any two reasons for the selection of pea plants by Mendel for his experiments.
Answer – Many varieties with contrasting forms of characters.
• Can easily be cross pollinated as well as self pollinated.
12. State the function of a vegetative propagule.
Answer – The structure of plants known as vegetative propagules is present in plants that have an asexual vegetative cycle and is capable of producing a totally new plant.
13. How can STDs be prevented?
Answer – Sexually transmitted diseases (STDs) get transferred from one individual to the other through sexual contact.
• STDs can be prevented by : The use of contraceptives, such as condoms, etc. while intercourse, can prevent the transfer of these diseases. Sex with unknown or multiple partners should be avoided as they may have such diseases. Regular medical checkup to ensure good health is necessary.
14. What is apomixis and what is its importance?
Answer – Apomixis is the mechanism of seed production without involving the process of meiosis and syngamy. It plays an important role in hybrid seed production. The method of producing hybrid seeds by cultivation is very expensive for farmers. Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis. Apomixis prevents the loss of specific characters in the hybrid. Also, it is a cost-effective method for producing seeds.
15. A group of teenagers was involved in drug abuse. They used syringes and needles to inject drugs. They indulged in this habit when they became adults. Administration of drugs through needles became a piece of cake for them. Raj was the most active drug abuser amongst them and use to take drugs in high profile parties. In a span of time he started losing weight and suffered Persistent Diarrhoea. He developed constant low grade fever and used to catch opportunistic infection. When he consulted a doctor he got himself tested for HIV in his blood and finally diagnosed with AIDS.
Questions :
(i) What is the cause of Raj’s weight loss?
Answer – The cause of Raj’s weight loss is that he is suffering from AIDS.
(ii) Is HIV a virus or bacteria.
Answer – HIV is a virus.
(iii) Write the cause of AIDS.
Answer – The cause of AIDS are unprotected sex, due to infected syringes, from suffering mother to foetus, sex with multiple partners.
(iv) Write a full form of AIDS.
Answer – Acquired Immuno Deficiency Syndrome.
16. What are the phases of the menstrual cycle? What happens if an egg is fertilized?
Answer – The menstrual cycle typically has four main phases:
1. Menstrual Phase – This is when bleeding occurs, lasting about 3-7 days. The body sheds the lining of the uterus.
2. Follicular Phase – This begins on the first day of menstruation and lasts until ovulation. During this time, the body produces hormones that help prepare eggs in the ovaries and build up the uterine lining.
3. Ovulation – Around the middle of the cycle, an egg is released from the ovary. This is the time when a person is most fertile.
4. Luteal Phase – After ovulation, the body produces hormones to prepare the uterus for a possible pregnancy. If the egg isn’t fertilized, hormone levels drop, leading to the start of a new menstrual cycle.
If an egg is fertilized by sperm, it travels to the uterus and implants into the uterine lining. This typically leads to pregnancy, and the menstrual cycle stops while the body supports the developing baby.
17. Describe the structure of human sperm with the help of labelled diagram.
Answer –
The sperm is the male gamete produced in the testes of the male reproductive system. It consists of three parts – head, middle piece and the tail. The sperm head is elongated and formed by the condensation of the nucleus. The anterior portion has a cap like structure called acrosome. It contains hyaluronidase, an enzyme that helps the sperm to enter the ovum during fertilization. A short neck connects the head and middle piece which comprises that centrioles. The middle piece contains the mitochondria which provides energy for the movement of the tail. It brings about sperm motility which is essential for fertilization.