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Define the following

1. Eutrophication

2. Biomagnification

3. Acid rain

4. Ozone depletion

5. Green house effect

(a) Describe the mechanism of urine formation in human excretory system. Draw a labelled diagram to illustrate your answer.
(b) Where is urine carried through ureters ?
(c) What is urethra ?

Does geographical isolation of individuals of a species lead to the formation of a new species ? Provide a suitable explanation for your answer.

The study of inheritance and variation is termed as __.

A species facing extremely high risk of extinction is termed as:

Question 63
Explain the role of mouth in the digestion of food.

Which of the following are produced by the nucleolus?

A single human skin cell after undergoing a single mitotic division would produce

Which of these is a genetic defect related to the eye?

A catalytic converter helps in the control of ___.

The organs which perform similar functions but have different basic structure are called :
(a) asymmetric organs
(b) analogous organs
(c) homologous organs
(d) homophonic organs

rRNA is synthesized in ________.

Enlist three adaptationsof leaves for photosynthesis

The exchange of oxygen and other gases between lungs and blood vessels takes place in_____.

Which of the following is true about sunken stomata and thick cuticle?

Mention five plant hormones with their function. [5 MARKS]

Why do crocodiles besides being reptilians have a completely partioned 4 chambered heart???

Which of the following statements about dark reaction is correct?

How does creation of variations in a species promote survival?

Match the following:
$\begin{array}{cccc}& A& & B\\ 1.& \text{Androecium}& a& \text{Whorl of sepals}\\ 2.& \text{Gynoecium}& b& \text{Whorl of petals}\\ 3.& \text{Corolla}& c& \text{Whorl of stamens}\\ 4.& \text{Calyx}& d& \text{Whorl of pistil/carpel}\end{array}$

Industrial wastes, oils and fats should not be thrown into the drains because they _____ .

For stomata to close, guard cells have to show :

A dihybrid tall plant with yellow flowers (TtYy) was crossed with a dwarf plant bearing white flowers (ttyy). What percentage of progeny is expected to be homozygous tall bearing yellow flowers?

The hormones that control the menstrual cycle in human beings is :

___________ has the ability to regulate the release of hormones.

Identify the following phases 1, 2, 3, & 4 in a eukaryotic cell cycle.

Who among the following sits between D and A?

Which of the following is incorrect about the placenta?

Which of the following will generate the maximum amount of pressure?

Triticale is obtained by

What happen to the food in mouth

For his experiments on heredity, Mendel used :

(a) papaya plants (b) potato plants (c) pea plants (d) pear plants

The set of female sex hormones secreted by ovary is __________________

Transport of food from the leaves to other parts of the plants is called:

In convergent evolution,

The word convergent signifying what?

Name the process of squeezing out of WBCs from capillaries

When pregnancy does not occur, the life of corpus luteum is about :

(a) 4 days (b) 10 days

(c) 14 days (d) 28 days

The amount of oxygen required by bacteria in water to break down wastes into simple inorganic substances is called ___

The best material for the study of mitosis in the laboratory is