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Question 29

Select the mismatched pair in the following and correct it.

(a) Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain

(b) Ecosystem — Biotic components of the environment

(c) Aquarium — A man-made ecosystem

(d) Parasites — Organisms which obtain food from other living organisms

Conjugation phenomenon of sexual reproduction is seen in

What is common between hepatitis infections and HIV infections?

Write
short notes on the functions of the following hormones,

(a)
Parathyroid hormone (PTH)

(b)
Thyroid hormones

(c)
Thymosins

(d) Androgens

(e)
Estrogens

(f) Insulin and Glucagon

Polymers of the type Z -M_n -X are called

Question 30

Cork cells are made impervious to water and gases by the presence of



(a) cellulose

(b) lipids

(c) suberin

(d) lignin

Sino-atrial node is called the pacemaker of our heart. Why?

Ureotelism is found in

If E. coli was allowed to grow for 80 minutes then what would be the proportions of light and hybrid densities in a DNA molecule?

Azeotropes

Match the following disorders of Urinary system :

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{i. Faeces}& \text{a. Hydrocarbon}\\ \text{ii. Urine}& \text{b. Bile}\\ \text{iii. Sebum}& \text{c. Urea}\end{array}$

Regarding assertion and reason , choose the correct option.
Assertion [A]: Lichens represent an intimate mutualistic relationship between fungi and photosynthesising algae.
Reason [R]: Mutualistic organisms mostly occupy the same niche and are studied together as they are functionally interlinked.

What is a hypothesis

Consider the following statements 1 - 4 each with one or two blanks

1. Bears go into ___a___ during winter to ___b___ cold weather.

2. A conical age pyramid with a broad base represents the ___c___ human population.

3. A wasp pollinating a big flower is an example of ___d___.

4. An area with a high level of species richness is known as ___e___.

Which one of the following options, gives the correct fill-ups for the respective blank number from (a) - (e) in the statements?

Jawless, exclusive marine bottom dwelling ectoparasites with underdeveloped chordata features are grouped in the superclass_____.

Question 4

What are the advantages of sexual reproduction over asexual reproduction?

The creation of proton gradient across the thylakoid membrane is a result of

Label the parts of a typical flower:

Which of these is the generic name that is part of the longest scientific name in the animal kingdom?

More than 70% of the livestock population is in

For fatty acids to be able to enter the pathways of cellular respiration, they must be ______.

Write the differences between:

Systole and Diastole

There are quite a few places where the author uses the expressions 'my heart sank', 'panic seized' etc. What was the reason for this?

Plants with ovaries having only one or a few ovules are generally pollinated by