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How are plants and animals depend on green plants? For 1,2&3marks

Why ozone layer can only form in stratosphere and not in troposphere

Abnormally increased number of RBCs is called_____________.

Define the term puberty. List two changes observed in girls at the time of puberty.

Which of the following places had serious nuclear explosions which lead to the death of many people?

The wavelength of radiation emitted by a body depends upon

___ was the first human ancestors to use fire.

Which STD is responsible for the appearance of a chancre, a small, painless, reddish-brown sore on the mouth or on the sex organs?

What is meant by acquired and inherited traits? Explain with one example each.

The ozone hole is maximum over _______ .

The wings of a housefly and the wings of a sparrow are an example of :
(a) analogous organs
(b) vestigial organs
(c) respiratory organs
(d) homologous organs

When you keep objects very close to the eye, ciliary muscles

Emissions from motor vehicles contain

Histone protein synthesis occurs during :

Why is a fruit not produced in hibiscus after fertillisation?

Choose the option that correctly describes night blindness.

Plants typically store the sugar produced from photosynthesis in the form of ____

Five kingdom classification was given by

Pulmonary semilunar valves are closed during __________ systole.

Mention , where in the human body are the following located and state their main functions :

(a) Corpus callosum

(b) Central canal

Which among the following carries both sensory and motor information?

___ is called the 'flight or flight' hormone.

Find out the wrong statement about angiosperm roots.

Which part of the brain is responsible for the balance of our body?

(a) What is meant by 'unisexual flowers' and 'bisexual flowers' ? Give two examples of each.
(b) What is pollination? How does pollination occur?
(c) Describe the process of fertilisation in a flower with the help of labelled diagrams.
(d) What changes take place in the flower after fertilisation which leads to the formation of seeds and fruit?

The myelin sheath is derived from

The two glands A and B which occur in pairs, are present in the endocrine system of humans. The pair of glands A is found only in females whereas the pair of glands B occurs only in males. The glands A make and secrete two hormones C and D whereas glands B make and secrete only one hormone E. In addition to hormones, glands A make gametes F whereas glands B make gametes G.

(a) What are glands A ?

(b) What are hormones C and D ?

(c) What are glands B ? Name the hormone E.

(d) What are gametes (i) F, and (ii) G ?

(e) Which event in the life of males and females is associated with the secretion of hormones C, D and E ?

Movement of molecules of a substance from the region of their higher concentration to the region of their lower concentration without the involvement of a separating membrane is called

(a) Osmosis (b) Diffusion

(c) Active transport (d) Capillarity

Binary fission describes the type of reproduction where the organism divides to form:
(a) many spores
(b) two daughters
(c) many buds
(d) two hyphae

The limbs of a frog and a lizard are an example of __ organs.

All plants give out oxygen during the day and carbon dioxide during night do you agree with the statement give reasons. And also tell if leaves of a healthy potted plant were coated with Vaseline all the plant remain healthy for a long time give reasons

The process through which the nutrients of the soil get percolated down below the soil due to heavy rainfall is calied

A green leaf is often compared to a factory. Match the items in Column A with those in Column B according to this comparison.

Based on the assertion and reason, choose the right option.
Assertion [A] : Different ecosystems have different species composition.
Reason [R] : The type of species that can thrive in an ecosystem is dependent upon its geography, topography and climate.

Which of the following is a factor causing loss of biodiversity?

When you are looking at the objects closer to the eye, then focal length of the eye :

What is the term given out for molecular attraction by which the particles within a body remain united throughout mass?

Why do organisms reproduce at the expense of energy even though reproduction is not as vital as respiration, excretion etc.?

Escherichia coli fully labelled with $N^{15}$ is allowed to grow in $N^{14}$ medium. The two strands of DNA molecule of the first generation bacteria have

Match the stages of mitosis listed in column I with the important events pertaining to respective stages given under column II; and choose the answer which gives the correct combination of alphabets of the two columns:

$\begin{array}{cccc}& \text{Column I Stages of mitosis}& & \text{Column II Important events}\\ \text{A}& \text{Interphase}& \text{p}& \text{Equatorial plate formation}\\ \text{B}& \text{Metaphase}& \text{q}& \text{Daughter chromosomes move to opposite poles}\\ \text{C}& \text{Anaphase}& \text{r}& \text{Centrioles divde}\\ & & \text{s}& \text{Synthetic phase}\end{array}$

Bundle of capillaries within the Bowman's capsule is