Nervous System — Biology STD 10 — Question

Given below is the hypothetical data in reference to population (in crores) of two countries X and Y, during the last three decades.

Country	1961	1971	1981
X	6.8	9.9	10.5
Y	15.5	15.5	15.2

The rate of growth of population of country_________has declined between the years_________and_________

The genetic diagram given below shows a monohybrid cross. B is the dominant allele and b is the recessive allele


Which of the parents and offspring are heterozygous?

The site of maturation of human sperm is the :

Assertion : Every chromosome, during metaphase has two chromatids.
Reason: Synthesis of DNA takes places in the S-phase of interphase.

Name the system that controls all the activities that you do.

Complete the following sentence with appropriate Word Neurilemma is:

The colour reflected by chlorophyll is

The packets of energy from the Sun are called

Ravi noticed that his potted plant was wilting despite being watered regularly. He suspected that the plant was not absorbing water properly. He added a balanced fertiliser and observed that the plan's condition improved. What was likely the reason for Ravi's plant wilting initially?