Plant Water Relation — BIOLOGY STD 12 Science — Question

Write about the various theories of evolution.

Enumerate the events in the ovary of a human female during:
Luteal phase of menstrual cycle.

Your school has been selected by the Department of Education to organise and host an interschool seminar on "Reproductive Health - Problems and Practices". However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is "too embarrassing."
Put forth four arguments with appropriate reasons and explanation to justify the topic to be very essential and timely.

Give importance of hypothalamus.

Pavlov’s experiment about conditional reflex.

1. Give reasons for:

1. Both strands of DNA are not copied during transcription.
2. Transcription and translation in bacteria can be coupled.

2. Differentiate between the process of transcription in prokaryotes and eukaryotes.

Drugs and alcohol give short-term 'high' and long-term ‘damages’, Discuss.

During the reproductive cycle of a human female, when, where and how does a placenta develop? What is the function of placenta during pregnancy and embryo development?

What are the Assisted Reproductive Techniques practised to help infertile couples? Describe any three techniques.

The following table shows certain diseases, their causative organisms and symptoms. Fill the gaps.

	Name of the Disease	Causative organism	Symptoms
i.	Ascariasis	Ascaris	________
ii.	________	Trichophyton	Appearance of dry, scaly lesions on various parts of the body.
iii.	Typhoid	________	High fever, weakness, headache, stomach pain, constipation.
iv.	Pneumonia	Streptococcus pneumoniae	________
v.	________	Rhino viruses	Nasal congestion and discharge, sorethroat, cough, headache.
vi.	Filariasis	________	Inflammation in lower limbs.