Question Bank [2022] — BIOLOGY STD 12 Science — Question

Identify the areas labelled (i), (ii), (iii) and (iv) in the pie chart given below representing the biodiversity of plants showing their proportionate number of species of major taxa.

Define phenotypic adaptation. Give one example.

Name the four levels of organisation that ecology is basically concerned with.

“Give me a living cell of any plant and I will give you a thousand plants of the same type” Is this only a slogan or is it scientifically possible? Write your comments and justify them.

What is meant by 'superior males' and 'superior females' in case of cattle?

Answer the following questions:
Why is it important to feed the newborn babies on colostrum?

Name the ancestors of man based on the features given below:

1. Human-like meat eater with 900cc brain, lived in Java.
2. More human with brain size 1400cc, lived in Central Asia, used hides and buried their dead.
3. Human-like, vegetarian, with brain capacity between 650cc and 800cc.
4. Man-like primate, that existed about 15 mya. Fossils found in Tanzania.

Following table gives certain terms associated with ART. Fill in the space A,B,C and D.

IVF and ET	A
B	lntroduction of zygote or embryo with 8-celled blastomeres into Fallopian tube.
C	lntroduction of ova of a donor into the Fallopian tube.
D	lntroduction of semen from the husband or healthy donor into the uterus.

Described the structure of root hair (diagram not expected)